Overview

SQL Rewriter is an SQL rewriting tool. It converts query statements into more efficient or standard forms based on preset rules to improve query efficiency.

NOTE:

• This function does not apply to statements that contain subqueries.
• This function supports only the SELECT and DELETE statements for deleting the entire table.
• This function contains 12 rewriting rules. Statements that do not comply with the rewriting rules are not processed.
• This function displays original query statements and rewritten statements on the screen. You are not advised to rewrite SQL statements that contain sensitive information.
• The rule for converting UNION to UNION ALL avoids deduplication and improves the query performance. The obtained result may be redundant.
• If a statement contains ORDER BY + specified column name or GROUP BY + specified column name, the SelfJoin rule is not applicable.