I have read the stuff on MS pivot tables and I am still having problems getting this correct.
I have a temp table that is being created, we will say that column 1 is a Store number, and column 2 is a week number and lastly column 3 is a total of some type. Also the Week numbers are dynamic, the store numbers are static.
Store Week xCount ------- ---- ------ 102 1 96 101 1 138 105 1 37 109 1 59 101 2 282 102 2 212 105 2 78 109 2 97 105 3 60 102 3 123 101 3 220 109 3 87
I would like it to come out as a pivot table, like this:
Store 1 2 3 4 5 6.... ----- 101 138 282 220 102 96 212 123 105 37 109
Store numbers down the side and weeks across the top.
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Answer
If you are using SQL Server 2005+, then you can use the PIVOT
function to transform the data from rows into columns.
It sounds like you will need to use dynamic sql if the weeks are unknown but it is easier to see the correct code using a hard-coded version initially.
First up, here are some quick table definitions and data for use:
CREATE TABLE yt ( [Store] int, [Week] int, [xCount] int ); INSERT INTO yt ( [Store], [Week], [xCount] ) VALUES (102, 1, 96), (101, 1, 138), (105, 1, 37), (109, 1, 59), (101, 2, 282), (102, 2, 212), (105, 2, 78), (109, 2, 97), (105, 3, 60), (102, 3, 123), (101, 3, 220), (109, 3, 87);
If your values are known, then you will hard-code the query:
select * from ( select store, week, xCount from yt ) src pivot ( sum(xcount) for week in ([1], [2], [3]) ) piv;
See SQL Demo
Then if you need to generate the week number dynamically, your code will be:
DECLARE @cols AS NVARCHAR(MAX), @query AS NVARCHAR(MAX) select @cols = STUFF((SELECT ',' + QUOTENAME(Week) from yt group by Week order by Week FOR XML PATH(''), TYPE ).value('.', 'NVARCHAR(MAX)') ,1,1,'') set @query = 'SELECT store,' + @cols + ' from ( select store, week, xCount from yt ) x pivot ( sum(xCount) for week in (' + @cols + ') ) p ' execute(@query);
See SQL Demo.
The dynamic version, generates the list of week
numbers that should be converted to columns. Both give the same result:
| STORE | 1 | 2 | 3 | --------------------------- | 101 | 138 | 282 | 220 | | 102 | 96 | 212 | 123 | | 105 | 37 | 78 | 60 | | 109 | 59 | 97 | 87 |