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Unpivot SQL Query Expand / Collapse
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Posted Monday, October 07, 2013 3:10 PM
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I have a table structure (tblmapping) like the following:

TableName ColumnName ColumnValue
Product ProductID 1
Product ProductID 2
Product ProductName Keyboard
Product ProductName Mouse

I want to convert from column based data to row based data. I tried the following query, but syntax errors:

SELECT col,value
FROM
(SELECT DISTINCT ColumnName
FROM tblMapping
WHERE TableName = 'Product') p
UNPIVOT
(ColumnValue FOR ColumnName IN (SELECT DISTINCT ColumnName
FROM tblMapping
WHERE TableName = 'Product')
) AS unpvt;

Msg 156, Level 15, State 1, Line 7
Incorrect syntax near the keyword 'SELECT'.
Msg 102, Level 15, State 1, Line 9
Incorrect syntax near ')'.

Not sure what I'm doing wrong. Thanks for the help.


Post #1502386
Posted Monday, October 07, 2013 6:47 PM


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Duplicate post. All replies here please: http://www.sqlservercentral.com/Forums/Topic1502389-392-1.aspx


My mantra: No loops! No CURSORs! No RBAR! Hoo-uh!

My thought question: Have you ever been told that your query runs too fast?

My advice:
INDEXing a poor-performing query is like putting sugar on cat food. Yeah, it probably tastes better but are you sure you want to eat it?
The path of least resistance can be a slippery slope. Take care that fixing your fixes of fixes doesn't snowball and end up costing you more than fixing the root cause would have in the first place.


Need to UNPIVOT? Why not CROSS APPLY VALUES instead?
Since random numbers are too important to be left to chance, let's generate some!
Learn to understand recursive CTEs by example.
Splitting strings based on patterns can be fast!
Post #1502441
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