Normalized data giving you problems? Learn how to use the SQL subselect statement and handle your database like a pro! We may earn from vendors via affiliate links or ...

A long time ago, when I didn’t really understand how databases work and didn’t know how to read EXPLAIN, I thought that subselects in SQL queries were bad and inefficient. As a simple example, let’s ...

SELECT '' AS six, f1 AS "Uncorrelated Field" FROM SUBSELECT_TBL WHERE f1 IN (SELECT f2 FROM SUBSELECT_TBL); SELECT '' AS six, f1 AS "Uncorrelated Field" FROM ...

Description When the option "Always use subselect for filters" is active and a table field is aliased in a query, attempting to sort the data grid results by that column creates invalid sql by using ...

* means that more than one payment can exist against the invoice. All the info is in the same table, and the relationship of the invoice to payment is by a transaction_no field. So, is there one table ...