Online Documentation for SQL Query for MySQL
The Custom Filter dialog is one of the filtering facilities implemented in Data View for your convenience.
To open the dialog, click the Arrow-Down button next to the column caption, and select the Custom item from the drop-down list.
Select a logical operator for checking the column values (like, is less than, is greater than, etc.) and set a value to be checked by this operator in the corresponding box on the right.
If necessary, you can set the second condition and specify the relation between the two conditions: whether both of them should be satisfied (AND) or just any of them (OR). Use the '_' character to represent any single symbol, and use the '%' character to represent any series of symbols in the condition string.