Courtesy of Jens Suessmeyer comes this little gem purloined from an internal discussion; cut-and-paste this into SQL Server Management Studio and see if you can answer the questions in the comments before you execute the script:
-- create and populate a table variable
DECLARE @Demonstration TABLE (
ID INT IDENTITY(1,1),
INSERT @Demonstration (Col1,Col2,Col3) VALUES (2, 100, 1)
INSERT @Demonstration (Col1,Col2,Col3) VALUES (100, 1, 2)
WHERE Col1 IN (1,2)
WHERE 1 IN (Col1,Col2)
I knew IN could examine a column for a list of values; I didn’t know that it could examine a list of columns for a value. For the record, here’s the result set:
This works in every version of SQL Server as far back as I can check (SQL Server 2000 SP4). Thanks, Jens, for debunking a case of one-dimensional thinking on my part!
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