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SQL Anywhere 11.0.0 » UltraLite - Database Management and Reference » UltraLite SQL Reference » UltraLite SQL elements reference » Expressions in UltraLite » Search conditions in UltraLite


EXISTS conditions

Checks whether a subquery produces any rows of query results

 [ NOT ] EXISTS ( subquery )

The EXISTS condition is TRUE if the subquery result contains at least one row, and FALSE if the subquery result does not contain any rows. The EXISTS condition cannot be UNKNOWN.

You can reverse the logic of the EXISTS condition by using the NOT EXISTS form. In this case, the test returns TRUE if the subquery produces no rows, and FALSE otherwise.


List the customers who placed orders after July 13, 2001.

SELECT GivenName, Surname
FROM Customers
 FROM SalesOrders
 WHERE (OrderDate > '2001-07-13') AND
       (Customers.ID = SalesOrders.CustomerID));