SELECT AND CONSUME Subqueries in INSERT Requests
An INSERT operation can use a SELECT AND CONSUME subquery to insert data from the row with the lowest value in the QITS column in the specified queue table and delete the row from the queue table.
The target table for the INSERT operation can be a base table or a queue table. If the target is a queue table, it can be the same queue table in the SELECT AND CONSUME subquery.
The SELECT AND CONSUME part of the request behaves like a regular SELECT AND CONSUME request. For details, see “SELECT AND CONSUME” on page 37.
When the target table is a queue table, the INSERT part of the request behaves like an INSERT into a queue table. For details, see “Inserting Rows Into Queue Tables” on page 365.
Certain restrictions apply to triggers. An INSERT operation that uses a SELECT AND CONSUME subquery cannot be used as either of the following: