clickhouse client --host 127.0.0.1 --port 9000 --query="select * from DatabaseName.TableName1 FORMAT CSV" > /opt/clickhouse/backup/DatabaseName.TableName1.csv
clickhouse client --host 127.0.0.1 --port 9000 --query="select * from DatabaseName.TableName2 FORMAT CSV" > /opt/clickhouse/backup/DatabaseName.TableName2.csv
clickhouse client --host 127.0.0.1 --port 9000 --query="select * from DataBaseName.TableName3 FORMAT CSV" > /opt/clickhouse/backup/DataBaseName.TableName3.csv