var gr = new GlideRecord('incident');.isValid() Check if current table is valid
.isEncodedQueryValid(String queryString) Check if queryString is valid
.isValidField(String columnName) Check if columnName is valid
.isValidRecord() Check if current record is valid
| Operator | type | description |
|---|---|---|
| = | number | equals |
| != | number | not equal |
| > | number | greater than |
| >= | number | greater than or equal |
From:
https://developer.servicenow.com/app.do#!/api_doc?v=madrid&id=c_GlideRecordScopedAPI