When you use the AsQueryable attribute in an expression, the query is executed at the database level (rather than in memory). Use this attribute when dealing with tables without a key, or when handling a high volume of records.
Note: Using this method might affect system performance.
Example of Expression with the AsQueryable Method
{activity}.Query("QueryWithoutSystemKeys").AsQueryable().First(Field("fldIWfId") == wf.WorkflowInstanceId).Field("Field1")
