grid > source > query > select > columns > expression
The <expression> element is used to configure an SQL expression that will be included in the select result.
The content of the expression element is not validated. It will be wrapped in a Zend_Db_Expr instance and added to the select instance unmodified.
Attributes:
It takes one optional Attribute:
- as
The as attribute is used to specify an alias name for the expression column in the result.