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WHILE


Allows one or more procedural SQL statements to be iteratively executed.



Usage

Procedural.

Description

The WHILE statement can be used to iteratively execute a sequence of one or more procedural-sql-statements.

The iteration continues as long as search-condition evaluates to true.

For information on procedural-sql-statements, see Procedural SQL Statements.

Restrictions

If label appears at the beginning and at the end of the WHILE statement, the same value must be specified in both places.

Specifying label is optional, however, if label appears at the end of the WHILE statement, it must also appear at the beginning.

A label is required at the beginning if the LEAVE statement is to be used to terminate the WHILE statement.

Notes

The WHILE statement may be terminated by executing the LEAVE statement using label. It will also terminate if an exception condition is raised, in accordance with the normal exception handling process.

Example

 SET I = 0;
 L1:
 WHILE I <= 10 DO
   ...
   SET I = I + 1;
 END WHILE L1;
 

For more information, see the Mimer SQL Programmer's Manual, Iteration Using WHILE.

Standard Compliance

Standard
Compliance
Comments
SQL-2011
Features outside core
Feature P002, "Computational completeness".


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