Skip to content

Instantly share code, notes, and snippets.

@openhubdev

openhubdev/mySQL101.md

Last active March 8, 2021 20:53
Show Gist options

  • Select an option

    Learn more about clone URLs
  • Save openhubdev/c0c8cbaefb73923a6439cf8ffd8f26b3 to your computer and use it in GitHub Desktop.

Select an option

Learn more about clone URLs
Save openhubdev/c0c8cbaefb73923a6439cf8ffd8f26b3 to your computer and use it in GitHub Desktop.
Download ZIP

Revisions

  1. openhubdev renamed this gist Mar 8, 2021. 1 changed file with 0 additions and 0 deletions.
    0 mySql101.md → mySQL101.md
    View file
    File renamed without changes.
  2. openhubdev revised this gist Mar 3, 2021. 1 changed file with 1 addition and 1 deletion.
    2 changes: 1 addition & 1 deletion mySql101.md
    View file
    Original file line number Diff line number Diff line change
    @@ -1,4 +1,4 @@
    # :muscle: MySQL commands 101
    # :dolphin: MySQL commands 101

    ## First step
    First where your mysql is
  3. openhubdev revised this gist Mar 3, 2021. No changes.
  4. openhubdev revised this gist Mar 3, 2021. 1 changed file with 1 addition and 1 deletion.
    2 changes: 1 addition & 1 deletion mySql101.md
    View file
    Original file line number Diff line number Diff line change
    @@ -1,4 +1,4 @@
    # MySQL commands 101
    # :muscle: MySQL commands 101

    ## First step
    First where your mysql is
  5. openhubdev revised this gist Mar 3, 2021. No changes.
  6. openhubdev revised this gist Mar 3, 2021. 1 changed file with 1 addition and 1 deletion.
    2 changes: 1 addition & 1 deletion mySql101.md
    View file
    Original file line number Diff line number Diff line change
    @@ -1,4 +1,4 @@
    # MySQL commands 101#
    # MySQL commands 101

    ## First step
    First where your mysql is
  7. openhubdev revised this gist Mar 3, 2021. 1 changed file with 7 additions and 2 deletions.
    9 changes: 7 additions & 2 deletions mySql101.md
    View file
    Original file line number Diff line number Diff line change
    @@ -222,12 +222,17 @@ Restore database (or database table) from backup.

    `# mysql -u username -ppassword databasename < /tmp/databasename.sql`

    Create Table Example 1.
    ## Create Table + fields

    Create Table Example 1:

    `mysql> CREATE TABLE [table name] (name VARCHAR(20));`

    Create Table Example 2: multiple rows.
    Create Table Example 2 w/ multiple rows:

    `mysql> CREATE TABLE User (id INT NOT NULL AUTO_INCREMENT PRIMARY KEY,firstName VARCHAR(35) NOT NULL,lastName VARCHAR(50) NOT NULL,username VARCHAR(50) NOT NULL,HASH VARCHAR(50) NOT NULL);`

    `CREATE TABLE SystemUsers (userId INT NOT NULL AUTO_INCREMENT PRIMARY KEY, email VARCHAR(100) NOT NULL, password VARCHAR(100) NOT NULL,firstName VARCHAR(100) NOT NULL, lastName VARCHAR(100) NULL, verifyToken VARCHAR(100) NULL, isEmailVerified BIT NULL, resetPwdToken VARCHAR(100) NULL, resetPwdExpiry DATETIME NULL, systemRole VARCHAR(20) NULL);
    `

    and so on...
  8. openhubdev revised this gist Feb 27, 2021. 1 changed file with 1 addition and 1 deletion.
    2 changes: 1 addition & 1 deletion mySql101.md
    View file
    Original file line number Diff line number Diff line change
    @@ -228,6 +228,6 @@ Create Table Example 1.

    Create Table Example 2: multiple rows.

    `mysql> CREATE TABLE User (id INT NOT NULL AUTO_INCREMENT PRIMARY KEY,firstName VARCHAR(35),lastName VARCHAR(50),username VARCHAR(50),HASH VARCHAR(50));`
    `mysql> CREATE TABLE User (id INT NOT NULL AUTO_INCREMENT PRIMARY KEY,firstName VARCHAR(35) NOT NULL,lastName VARCHAR(50) NOT NULL,username VARCHAR(50) NOT NULL,HASH VARCHAR(50) NOT NULL);`

    and so on...
  9. openhubdev revised this gist Feb 27, 2021. 1 changed file with 1 addition and 1 deletion.
    2 changes: 1 addition & 1 deletion mySql101.md
    View file
    Original file line number Diff line number Diff line change
    @@ -228,6 +228,6 @@ Create Table Example 1.

    Create Table Example 2: multiple rows.

    `mysql> CREATE TABLE USER(id INT NOT NULL AUTO_INCREMENT PRIMARY KEY,firstName VARCHAR(35),lastName VARCHAR(50),username VARCHAR(50),HASH VARCHAR(50));`
    `mysql> CREATE TABLE User (id INT NOT NULL AUTO_INCREMENT PRIMARY KEY,firstName VARCHAR(35),lastName VARCHAR(50),username VARCHAR(50),HASH VARCHAR(50));`

    and so on...
  10. openhubdev revised this gist Feb 27, 2021. 1 changed file with 1 addition and 1 deletion.
    2 changes: 1 addition & 1 deletion mySql101.md
    View file
    Original file line number Diff line number Diff line change
    @@ -228,6 +228,6 @@ Create Table Example 1.

    Create Table Example 2: multiple rows.

    `mysql> create table [table name] (personid int(50) not null auto_increment primary key,firstname varchar(35),middlename varchar(50),lastnamevarchar(50) default 'somethiing');`
    `mysql> CREATE TABLE USER(id INT NOT NULL AUTO_INCREMENT PRIMARY KEY,firstName VARCHAR(35),lastName VARCHAR(50),username VARCHAR(50),HASH VARCHAR(50));`

    and so on...
  11. openhubdev revised this gist Feb 27, 2021. 1 changed file with 1 addition and 1 deletion.
    2 changes: 1 addition & 1 deletion mySql101.md
    View file
    Original file line number Diff line number Diff line change
    @@ -226,7 +226,7 @@ Create Table Example 1.

    `mysql> CREATE TABLE [table name] (name VARCHAR(20));`

    Create Table Example 2.
    Create Table Example 2: multiple rows.

    `mysql> create table [table name] (personid int(50) not null auto_increment primary key,firstname varchar(35),middlename varchar(50),lastnamevarchar(50) default 'somethiing');`

  12. openhubdev revised this gist Feb 27, 2021. 1 changed file with 1 addition and 0 deletions.
    1 change: 1 addition & 0 deletions mySql101.md
    View file
    Original file line number Diff line number Diff line change
    @@ -200,6 +200,7 @@ Delete unique from table.
    `mysql> alter table [table name] drop index [colmn name];`

    ---
    ## Import & Dump..etc

    Load a CSV file into a table.

  13. openhubdev revised this gist Feb 27, 2021. 1 changed file with 13 additions and 8 deletions.
    21 changes: 13 additions & 8 deletions mySql101.md
    View file
    Original file line number Diff line number Diff line change
    @@ -92,7 +92,13 @@ List all databases on the server.

    `mysql> show databases;`

    Switch to a database.
    To delete a db.

    `mysql> drop database [database name];`

    ---

    **Switch to a database.**

    `mysql> use [db name];`

    @@ -104,10 +110,6 @@ To see table's field formats.

    `mysql> describe [table name];`

    To delete a db.

    `mysql> drop database [database name];`

    To delete a table.

    `mysql> drop table [table name];`
    @@ -161,7 +163,6 @@ Sum column.
    `mysql> SELECT SUM(*) FROM [table name];`



    To update info already in a table.

    `mysql> UPDATE [table name] SET Select_priv = 'Y',Insert_priv = 'Y',Update_priv = 'Y' where [field name] = 'user';`
    @@ -187,7 +188,7 @@ Change column name.
    `mysql> alter table [table name] change [old column name] [new column name] varchar (50);`

    Make a unique column so you get no dupes.
    m

    `ysql> alter table [table name] add unique ([column name]);`

    Make a column bigger.
    @@ -198,6 +199,8 @@ Delete unique from table.

    `mysql> alter table [table name] drop index [colmn name];`

    ---

    Load a CSV file into a table.

    `mysql> LOAD DATA INFILE '/tmp/filename.csv' replace INTO TABLE [table name] FIELDS TERMINATED BY ',' LINES TERMINATED BY '\n' (field1,field2,field3);`
    @@ -224,4 +227,6 @@ Create Table Example 1.

    Create Table Example 2.

    `mysql> create table [table name] (personid int(50) not null auto_increment primary key,firstname varchar(35),middlename varchar(50),lastnamevarchar(50) default 'somethiing');`
    `mysql> create table [table name] (personid int(50) not null auto_increment primary key,firstname varchar(35),middlename varchar(50),lastnamevarchar(50) default 'somethiing');`

    and so on...
  14. openhubdev revised this gist Feb 27, 2021. 1 changed file with 2 additions and 0 deletions.
    2 changes: 2 additions & 0 deletions mySql101.md
    View file
    Original file line number Diff line number Diff line change
    @@ -11,6 +11,8 @@ To login (from unix shell) use -h only if needed.
    mysql -u root -p
    or
    [mysql dir]/bin/mysql -h hostname -u username -p
    // on Mac MAMP:
    /Applications/MAMP/Library/bin/mysql -u root -p
    ```

  15. openhubdev revised this gist Feb 27, 2021. 1 changed file with 6 additions and 1 deletion.
    7 changes: 6 additions & 1 deletion mySql101.md
    View file
    Original file line number Diff line number Diff line change
    @@ -7,7 +7,12 @@ First where your mysql is

    To login (from unix shell) use -h only if needed.

    `[mysql dir]/bin/mysql -h hostname -u username -ppassword` // -h hostname -u root -p
    ```
    mysql -u root -p
    or
    [mysql dir]/bin/mysql -h hostname -u username -p
    ```

    To login (from windows)

  16. openhubdev revised this gist Feb 27, 2021. 1 changed file with 5 additions and 1 deletion.
    6 changes: 5 additions & 1 deletion mySql101.md
    View file
    Original file line number Diff line number Diff line change
    @@ -1,9 +1,13 @@
    # MySQL commands 101#

    ## First step
    First where your mysql is

    `which mysql`

    To login (from unix shell) use -h only if needed.

    `[mysql dir]/bin/mysql -h hostname -u username -ppassword`
    `[mysql dir]/bin/mysql -h hostname -u username -ppassword` // -h hostname -u root -p

    To login (from windows)

  17. openhubdev revised this gist Feb 27, 2021. 1 changed file with 66 additions and 61 deletions.
    127 changes: 66 additions & 61 deletions mySql101.md
    View file
    Original file line number Diff line number Diff line change
    @@ -1,5 +1,6 @@
    # MySQL commands 101#

    ## First step
    To login (from unix shell) use -h only if needed.

    `[mysql dir]/bin/mysql -h hostname -u username -ppassword`
    @@ -8,6 +9,70 @@ To login (from windows)

    `mysql dir/bin/mysql.exe -h hostname -u username -ppassword`

    ## setting credentials
    Creating a new user. Login as root. Switch to the MySQL db. Make the user. Update privs.
    ```
    # mysql -u root -p
    mysql> use mysql;
    mysql> INSERT INTO user (Host,User,Password) VALUES('%','username',PASSWORD('password'));
    mysql> flush privileges;
    ```

    Change a users password from unix shell.

    `# [mysql dir]/bin/mysqladmin -u username -h hostname -ppassword 'new-password'`

    Change a users password from MySQL prompt. Login as root. Set the password. Update privileges.

    ```# mysql -u root -p
    mysql> SET PASSWORD FOR 'user'@'hostname' = PASSWORD('password');
    mysql> flush privileges;
    ```
    Recover a MySQL root password. Stop the MySQL server process. Start again with no grant tables. Login to MySQL as root. Set new password. Exit MySQL and restart MySQL server.

    ```
    # /etc/init.d/mysql stop
    # mysqld_safe --skip-grant-tables
    # mysql -u root
    mysql> use mysql;
    mysql> update user set password=PASSWORD("newpassword") where User='root';
    mysql> flush privileges;
    mysql> quit
    # /etc/init.d/mysql stop
    # /etc/init.d/mysql start
    ```
    Set a root password if there is no root password.

    `# mysqladmin -u root password newpassword`

    Update a root password.

    `# mysqladmin -u root -p oldpassword newpassword`

    Allow the user "Someone" to connect to the server from localhost using the password "passwd". Login as root. Switch to the MySQL db. Give privs. Update privs.

    ```
    > mysql -u root -p
    mysql> use mysql;
    mysql> grant usage on *.* to Someone@localhost identified by 'passwd';
    mysql> flush privileges;
    ```
    Give user privilages for a db. Login as root. Switch to the MySQL db. Grant privs. Update privs.

    ```
    # mysql -u root -p
    mysql> use mysql;
    mysql>INSERT INTO user(Host,Db,User,Select_priv,Insert_priv,Update_priv,Delete_priv,Create_priv,Drop_priv)
    VALUES ('%','databasename','username','Y','Y','Y','Y','Y','N');
    mysql> flush privileges;
    or
    mysql> grant all privileges on databasename.* to username@localhost;
    mysql> flush privileges;
    ```
    ---

    Create a database.

    `mysql> create database [databasename];`
    @@ -58,7 +123,7 @@ Show all records not containing the name "Something" AND the phone number '01234

    Show all records starting with the letters 'Something' AND the phone number '0123456789'.

    `mysql> SELECT * FROM [table name] WHERE name like "Something%" AND phone_number = '0123456789';``
    `mysql> SELECT * FROM [table name] WHERE name like "Something%" AND phone_number = '0123456789';`

    Show all records starting with letters 'Something' AND the phone number '0123456789' limit to records 1 through 5.

    @@ -84,67 +149,7 @@ Sum column.

    `mysql> SELECT SUM(*) FROM [table name];`

    Creating a new user. Login as root. Switch to the MySQL db. Make the user. Update privs.
    ```
    # mysql -u root -p
    mysql> use mysql;
    mysql> INSERT INTO user (Host,User,Password) VALUES('%','username',PASSWORD('password'));
    mysql> flush privileges;
    ```

    Change a users password from unix shell.

    `# [mysql dir]/bin/mysqladmin -u username -h hostname -ppassword 'new-password'`

    Change a users password from MySQL prompt. Login as root. Set the password. Update privileges.

    ```# mysql -u root -p
    mysql> SET PASSWORD FOR 'user'@'hostname' = PASSWORD('password');
    mysql> flush privileges;
    ```
    Recover a MySQL root password. Stop the MySQL server process. Start again with no grant tables. Login to MySQL as root. Set new password. Exit MySQL and restart MySQL server.

    ```
    # /etc/init.d/mysql stop
    # mysqld_safe --skip-grant-tables
    # mysql -u root
    mysql> use mysql;
    mysql> update user set password=PASSWORD("newpassword") where User='root';
    mysql> flush privileges;
    mysql> quit
    # /etc/init.d/mysql stop
    # /etc/init.d/mysql start
    ```
    Set a root password if there is no root password.

    `# mysqladmin -u root password newpassword`

    Update a root password.

    `# mysqladmin -u root -p oldpassword newpassword`

    Allow the user "Someone" to connect to the server from localhost using the password "passwd". Login as root. Switch to the MySQL db. Give privs. Update privs.

    ```
    > mysql -u root -p
    mysql> use mysql;
    mysql> grant usage on *.* to Someone@localhost identified by 'passwd';
    mysql> flush privileges;
    ```
    Give user privilages for a db. Login as root. Switch to the MySQL db. Grant privs. Update privs.

    ```
    # mysql -u root -p
    mysql> use mysql;
    mysql>INSERT INTO user(Host,Db,User,Select_priv,Insert_priv,Update_priv,Delete_priv,Create_priv,Drop_priv)
    VALUES ('%','databasename','username','Y','Y','Y','Y','Y','N');
    mysql> flush privileges;
    or
    mysql> grant all privileges on databasename.* to username@localhost;
    mysql> flush privileges;
    ```

    To update info already in a table.

  18. openhubdev revised this gist Feb 27, 2021. 1 changed file with 87 additions and 41 deletions.
    128 changes: 87 additions & 41 deletions mySql101.md
    View file
    Original file line number Diff line number Diff line change
    @@ -17,71 +17,94 @@ List all databases on the server.
    `mysql> show databases;`

    Switch to a database.
    mysql> use [db name];

    `mysql> use [db name];`

    To see all the tables in the db.
    mysql> show tables;

    `mysql> show tables;`

    To see table's field formats.
    mysql> describe [table name];

    `mysql> describe [table name];`

    To delete a db.
    mysql> drop database [database name];

    `mysql> drop database [database name];`

    To delete a table.
    mysql> drop table [table name];

    `mysql> drop table [table name];`

    Show all data from a table.
    mysql> SELECT * FROM [table name];

    `mysql> SELECT * FROM [table name];`

    To return columns and column information.
    mysql> show columns from [table name];

    `mysql> show columns from [table name];`

    Show particular rows with the given value.
    mysql> SELECT * FROM [table name] WHERE [field name] = "value";

    `mysql> SELECT * FROM [table name] WHERE [field name] = "value";`

    Show all records containing the name "Something" AND the phone number '0123456789'.
    mysql> SELECT * FROM [table name] WHERE name = "Something" AND phone_number = '0123456789';

    `mysql> SELECT * FROM [table name] WHERE name = "Something" AND phone_number = '0123456789';`

    Show all records not containing the name "Something" AND the phone number '0123456789' order by the phone_number field.
    mysql> SELECT * FROM [table name] WHERE name != "Something" AND phone_number = '0123456789' order by phone_number;

    `mysql> SELECT * FROM [table name] WHERE name != "Something" AND phone_number = '0123456789' order by phone_number;`

    Show all records starting with the letters 'Something' AND the phone number '0123456789'.
    mysql> SELECT * FROM [table name] WHERE name like "Something%" AND phone_number = '0123456789';

    `mysql> SELECT * FROM [table name] WHERE name like "Something%" AND phone_number = '0123456789';``

    Show all records starting with letters 'Something' AND the phone number '0123456789' limit to records 1 through 5.
    mysql> SELECT * FROM [table name] WHERE name like "Something%" AND phone_number = '0123456789' limit 1,5;

    `mysql> SELECT * FROM [table name] WHERE name like "Something%" AND phone_number = '0123456789' limit 1,5;`

    Use a regular expression to find records. Use "REGEXP BINARY" to force case-sensitivity. This finds any record beginning with a.
    mysql> SELECT * FROM [table name] WHERE rec RLIKE "^a";

    `mysql> SELECT * FROM [table name] WHERE rec RLIKE "^a";`

    Show unique records.
    mysql> SELECT DISTINCT [column name] FROM [table name];

    `mysql> SELECT DISTINCT [column name] FROM [table name];`

    Show selected records sorted in an ascending (asc) or descending (desc).
    mysql> SELECT [col1],[col2] FROM [table name] ORDER BY [col2] DESC;

    `mysql> SELECT [col1],[col2] FROM [table name] ORDER BY [col2] DESC;`

    Return number of rows.
    mysql> SELECT COUNT(*) FROM [table name];

    `mysql> SELECT COUNT(*) FROM [table name];`

    Sum column.
    mysql> SELECT SUM(*) FROM [table name];

    `mysql> SELECT SUM(*) FROM [table name];`

    Creating a new user. Login as root. Switch to the MySQL db. Make the user. Update privs.
    ```
    # mysql -u root -p
    mysql> use mysql;
    mysql> INSERT INTO user (Host,User,Password) VALUES('%','username',PASSWORD('password'));
    mysql> flush privileges;
    ```

    Change a users password from unix shell.
    # [mysql dir]/bin/mysqladmin -u username -h hostname -ppassword 'new-password'

    `# [mysql dir]/bin/mysqladmin -u username -h hostname -ppassword 'new-password'`

    Change a users password from MySQL prompt. Login as root. Set the password. Update privileges.
    # mysql -u root -p

    ```# mysql -u root -p
    mysql> SET PASSWORD FOR 'user'@'hostname' = PASSWORD('password');
    mysql> flush privileges;

    ```
    Recover a MySQL root password. Stop the MySQL server process. Start again with no grant tables. Login to MySQL as root. Set new password. Exit MySQL and restart MySQL server.

    ```
    # /etc/init.d/mysql stop
    # mysqld_safe --skip-grant-tables
    # mysql -u root
    @@ -91,20 +114,26 @@ mysql> flush privileges;
    mysql> quit
    # /etc/init.d/mysql stop
    # /etc/init.d/mysql start

    ```
    Set a root password if there is no root password.
    # mysqladmin -u root password newpassword

    `# mysqladmin -u root password newpassword`

    Update a root password.
    # mysqladmin -u root -p oldpassword newpassword

    `# mysqladmin -u root -p oldpassword newpassword`

    Allow the user "Someone" to connect to the server from localhost using the password "passwd". Login as root. Switch to the MySQL db. Give privs. Update privs.
    # mysql -u root -p

    ```
    > mysql -u root -p
    mysql> use mysql;
    mysql> grant usage on *.* to Someone@localhost identified by 'passwd';
    mysql> flush privileges;

    ```
    Give user privilages for a db. Login as root. Switch to the MySQL db. Grant privs. Update privs.

    ```
    # mysql -u root -p
    mysql> use mysql;
    mysql>INSERT INTO user(Host,Db,User,Select_priv,Insert_priv,Update_priv,Delete_priv,Create_priv,Drop_priv)
    @@ -115,51 +144,68 @@ or
    mysql> grant all privileges on databasename.* to username@localhost;
    mysql> flush privileges;
    ```

    To update info already in a table.
    mysql> UPDATE [table name] SET Select_priv = 'Y',Insert_priv = 'Y',Update_priv = 'Y' where [field name] = 'user';

    `mysql> UPDATE [table name] SET Select_priv = 'Y',Insert_priv = 'Y',Update_priv = 'Y' where [field name] = 'user';`

    Delete a row(s) from a table.
    mysql> DELETE from [table name] where [field name] = 'fieldvalue';

    `mysql> DELETE from [table name] where [field name] = 'fieldvalue';`

    Update database permissions/privilages.
    mysql> flush privileges;

    `mysql> flush privileges;`

    Delete a column.
    mysql> alter table [table name] drop column [column name];

    `mysql> alter table [table name] drop column [column name];`

    Add a new column to db.
    mysql> alter table [table name] add column [new column name] varchar (20);

    `mysql> alter table [table name] add column [new column name] varchar (20);`

    Change column name.
    mysql> alter table [table name] change [old column name] [new column name] varchar (50);

    `mysql> alter table [table name] change [old column name] [new column name] varchar (50);`

    Make a unique column so you get no dupes.
    mysql> alter table [table name] add unique ([column name]);
    m
    `ysql> alter table [table name] add unique ([column name]);`

    Make a column bigger.
    mysql> alter table [table name] modify [column name] VARCHAR(3);

    `mysql> alter table [table name] modify [column name] VARCHAR(3);`

    Delete unique from table.
    mysql> alter table [table name] drop index [colmn name];

    `mysql> alter table [table name] drop index [colmn name];`

    Load a CSV file into a table.
    mysql> LOAD DATA INFILE '/tmp/filename.csv' replace INTO TABLE [table name] FIELDS TERMINATED BY ',' LINES TERMINATED BY '\n' (field1,field2,field3);

    `mysql> LOAD DATA INFILE '/tmp/filename.csv' replace INTO TABLE [table name] FIELDS TERMINATED BY ',' LINES TERMINATED BY '\n' (field1,field2,field3);`

    Dump all databases for backup. Backup file is sql commands to recreate all db's.
    # mysqldump -u username -ppassword --opt > /tmp/alldatabases.sql

    `# mysqldump -u username -ppassword --opt > /tmp/alldatabases.sql`

    Dump one database for backup.
    # mysqldump -u username -ppassword --databases databasename > /tmp/databasename.sql

    `# mysqldump -u username -ppassword --databases databasename > /tmp/databasename.sql`

    Dump a table from a database.
    # mysqldump -u username -ppassword databasename tablename > /tmp/databasename.tablename.sql

    `# mysqldump -u username -ppassword databasename tablename > /tmp/databasename.tablename.sql`

    Restore database (or database table) from backup.
    # mysql -u username -ppassword databasename < /tmp/databasename.sql

    `# mysql -u username -ppassword databasename < /tmp/databasename.sql`

    Create Table Example 1.
    mysql> CREATE TABLE [table name] (name VARCHAR(20));

    `mysql> CREATE TABLE [table name] (name VARCHAR(20));`

    Create Table Example 2.
    mysql> create table [table name] (personid int(50) not null auto_increment primary key,firstname varchar(35),middlename varchar(50),lastnamevarchar(50) default 'somethiing');

    `mysql> create table [table name] (personid int(50) not null auto_increment primary key,firstname varchar(35),middlename varchar(50),lastnamevarchar(50) default 'somethiing');`
  19. openhubdev revised this gist Feb 27, 2021. 1 changed file with 4 additions and 0 deletions.
    4 changes: 4 additions & 0 deletions mySql101.md
    View file
    Original file line number Diff line number Diff line change
    @@ -1,15 +1,19 @@
    # MySQL commands 101#

    To login (from unix shell) use -h only if needed.

    `[mysql dir]/bin/mysql -h hostname -u username -ppassword`

    To login (from windows)

    `mysql dir/bin/mysql.exe -h hostname -u username -ppassword`

    Create a database.

    `mysql> create database [databasename];`

    List all databases on the server.

    `mysql> show databases;`

    Switch to a database.
  20. openhubdev revised this gist Feb 27, 2021. No changes.
  21. openhubdev created this gist Feb 27, 2021.
    161 changes: 161 additions & 0 deletions mySql101.md
    View file
    Original file line number Diff line number Diff line change
    @@ -0,0 +1,161 @@
    # MySQL commands 101#

    To login (from unix shell) use -h only if needed.
    `[mysql dir]/bin/mysql -h hostname -u username -ppassword`

    To login (from windows)
    `mysql dir/bin/mysql.exe -h hostname -u username -ppassword`

    Create a database.
    `mysql> create database [databasename];`

    List all databases on the server.
    `mysql> show databases;`

    Switch to a database.
    mysql> use [db name];

    To see all the tables in the db.
    mysql> show tables;

    To see table's field formats.
    mysql> describe [table name];

    To delete a db.
    mysql> drop database [database name];

    To delete a table.
    mysql> drop table [table name];

    Show all data from a table.
    mysql> SELECT * FROM [table name];

    To return columns and column information.
    mysql> show columns from [table name];

    Show particular rows with the given value.
    mysql> SELECT * FROM [table name] WHERE [field name] = "value";

    Show all records containing the name "Something" AND the phone number '0123456789'.
    mysql> SELECT * FROM [table name] WHERE name = "Something" AND phone_number = '0123456789';

    Show all records not containing the name "Something" AND the phone number '0123456789' order by the phone_number field.
    mysql> SELECT * FROM [table name] WHERE name != "Something" AND phone_number = '0123456789' order by phone_number;

    Show all records starting with the letters 'Something' AND the phone number '0123456789'.
    mysql> SELECT * FROM [table name] WHERE name like "Something%" AND phone_number = '0123456789';

    Show all records starting with letters 'Something' AND the phone number '0123456789' limit to records 1 through 5.
    mysql> SELECT * FROM [table name] WHERE name like "Something%" AND phone_number = '0123456789' limit 1,5;

    Use a regular expression to find records. Use "REGEXP BINARY" to force case-sensitivity. This finds any record beginning with a.
    mysql> SELECT * FROM [table name] WHERE rec RLIKE "^a";

    Show unique records.
    mysql> SELECT DISTINCT [column name] FROM [table name];

    Show selected records sorted in an ascending (asc) or descending (desc).
    mysql> SELECT [col1],[col2] FROM [table name] ORDER BY [col2] DESC;

    Return number of rows.
    mysql> SELECT COUNT(*) FROM [table name];

    Sum column.
    mysql> SELECT SUM(*) FROM [table name];

    Creating a new user. Login as root. Switch to the MySQL db. Make the user. Update privs.
    # mysql -u root -p
    mysql> use mysql;
    mysql> INSERT INTO user (Host,User,Password) VALUES('%','username',PASSWORD('password'));
    mysql> flush privileges;

    Change a users password from unix shell.
    # [mysql dir]/bin/mysqladmin -u username -h hostname -ppassword 'new-password'

    Change a users password from MySQL prompt. Login as root. Set the password. Update privileges.
    # mysql -u root -p
    mysql> SET PASSWORD FOR 'user'@'hostname' = PASSWORD('password');
    mysql> flush privileges;

    Recover a MySQL root password. Stop the MySQL server process. Start again with no grant tables. Login to MySQL as root. Set new password. Exit MySQL and restart MySQL server.
    # /etc/init.d/mysql stop
    # mysqld_safe --skip-grant-tables
    # mysql -u root
    mysql> use mysql;
    mysql> update user set password=PASSWORD("newpassword") where User='root';
    mysql> flush privileges;
    mysql> quit
    # /etc/init.d/mysql stop
    # /etc/init.d/mysql start

    Set a root password if there is no root password.
    # mysqladmin -u root password newpassword

    Update a root password.
    # mysqladmin -u root -p oldpassword newpassword

    Allow the user "Someone" to connect to the server from localhost using the password "passwd". Login as root. Switch to the MySQL db. Give privs. Update privs.
    # mysql -u root -p
    mysql> use mysql;
    mysql> grant usage on *.* to Someone@localhost identified by 'passwd';
    mysql> flush privileges;

    Give user privilages for a db. Login as root. Switch to the MySQL db. Grant privs. Update privs.
    # mysql -u root -p
    mysql> use mysql;
    mysql>INSERT INTO user(Host,Db,User,Select_priv,Insert_priv,Update_priv,Delete_priv,Create_priv,Drop_priv)
    VALUES ('%','databasename','username','Y','Y','Y','Y','Y','N');
    mysql> flush privileges;

    or

    mysql> grant all privileges on databasename.* to username@localhost;
    mysql> flush privileges;

    To update info already in a table.
    mysql> UPDATE [table name] SET Select_priv = 'Y',Insert_priv = 'Y',Update_priv = 'Y' where [field name] = 'user';

    Delete a row(s) from a table.
    mysql> DELETE from [table name] where [field name] = 'fieldvalue';

    Update database permissions/privilages.
    mysql> flush privileges;

    Delete a column.
    mysql> alter table [table name] drop column [column name];

    Add a new column to db.
    mysql> alter table [table name] add column [new column name] varchar (20);

    Change column name.
    mysql> alter table [table name] change [old column name] [new column name] varchar (50);

    Make a unique column so you get no dupes.
    mysql> alter table [table name] add unique ([column name]);

    Make a column bigger.
    mysql> alter table [table name] modify [column name] VARCHAR(3);

    Delete unique from table.
    mysql> alter table [table name] drop index [colmn name];

    Load a CSV file into a table.
    mysql> LOAD DATA INFILE '/tmp/filename.csv' replace INTO TABLE [table name] FIELDS TERMINATED BY ',' LINES TERMINATED BY '\n' (field1,field2,field3);

    Dump all databases for backup. Backup file is sql commands to recreate all db's.
    # mysqldump -u username -ppassword --opt > /tmp/alldatabases.sql

    Dump one database for backup.
    # mysqldump -u username -ppassword --databases databasename > /tmp/databasename.sql

    Dump a table from a database.
    # mysqldump -u username -ppassword databasename tablename > /tmp/databasename.tablename.sql

    Restore database (or database table) from backup.
    # mysql -u username -ppassword databasename < /tmp/databasename.sql

    Create Table Example 1.
    mysql> CREATE TABLE [table name] (name VARCHAR(20));

    Create Table Example 2.
    mysql> create table [table name] (personid int(50) not null auto_increment primary key,firstname varchar(35),middlename varchar(50),lastnamevarchar(50) default 'somethiing');