Inspect the Main Query and Its SQL
Lets administrators add ?wpide_query=1 to a front-end URL to print the main query's variables, the SQL it ran and the number of posts found at the bottom of the page.
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List Every Database Query on a Page for Administrators
When SAVEQUERIES is enabled, lets administrators add ?wpide_queries=1 to a front-end URL to see every SQL query of the page with its time and calling function, slowest first.