Returns the plan optimization strategy of a SQL statement.
EXPLANATION( string-expression )
string-expression The SQL statement, which is commonly a SELECT statement, but can also be an UPDATE or DELETE statement.
LONG VARCHAR
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.
SQL/2003 Vendor extension.
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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