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SQL SERVER – Simple Puzzle Using Union and Union All

March 24, 2008
Pinal Dave
SQL, SQL Puzzle, SQL Server, SQL Tips and Tricks
SQL Scripts, SQL Utility
I often get request to write puzzles using SQL Server. Today, I am presenting one very simple but very interesting puzzle. What will be the output of following two SQL Scripts. First try to answer without running this two script in Query Editor. Script 1 SELECT 1 UNION ALL (SELECT…
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