EXPLANATION function [Miscellaneous]

Returns the plan optimization strategy of a SQL statement.

Syntax 
EXPLANATION(  string-expression )
Parameters

  • string-expression   The SQL statement, which is commonly a SELECT statement, but can also be an UPDATE or DELETE statement.

Remarks

The optimization is returned as a string.

This information can help you decide which indexes to add or how to structure your database for better performance.

See also
Standards and compatibility

  • SQL/2003   Vendor extension.

Example

The following statement passes a SELECT statement as a string parameter and returns the plan for executing the query.

SELECT EXPLANATION( 'SELECT * FROM Departments WHERE DepartmentID > 100' );
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