Web Reference: Dec 24, 2014 · As to why you get more rows when adding columns into SELECT and GROUP BY -- well, that's how GROUP BY aggregates work. If you add additional columns into SELECT you must also group them (in most RDBMS) and as long as the values differ across rows, they will result in more grouped rows. Nov 29, 2016 · I have a fairly complex query that joins several tables and views. It executes pretty quickly (~9 seconds for 2200 rows), except when I add a column from a view that is already joined in the query ... Feb 9, 2026 · The INSERT INTO statement is used to add new records into a table, either by inserting full rows, selected columns, multiple rows at once, or copying data from another table.
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