sql,sql-server,sql-server-2008,sql-server-2008-r2 , One identifier for set of values
One identifier for set of values
I have this two columns. One is filled with some data, second is null.
I want to generate values for col1 that will gather and group values from col2. So one value in col1 for the same values from col2. Like for 72 I assigned 1, for 33 I assigned 2 etc...
1 | 72
1 | 72
1 | 72
2 | 33
2 | 33
3 | 12
3 | 12
4 | 55
1 | 72
I was trying with simple query as a begin bot I can't move forward.
set t1.id = (select MAX(coalesce(t2.id, 0)) + 1 from tblTest t2) from tbltest t1
where t1.id is null;
I'm using sql server 2008 r2.
You can solve this for example using the
See the example below:
CREATE TABLE #yourTable(col1 int, col2 int)
INSERT INTO #yourTable(col1,col2)
VALUES(null, 72),(null, 72),(null, 72),(null, 33),(null, 33),(null, 12),(null, 12),(null, 55),(null, 72)
-- Your part:
SET col1 = numbering.number
FROM #yourTable yt
INNER JOIN (
SELECT DISTINCT col2, DENSE_RANK() OVER(order by col2) as number
ON yt.col2 = numbering.col2
DROP TABLE #yourTable
You need to specify a logic behind your numbering. As your missing these logic, I'll assume you want the numbering based on your col2 ordering.
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