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Returning The Maximum Value For A Row
From Wiki
You want to return the maximum value for a column and all the other columns for that table, How can you do that? First create this table
- CREATE TABLE #MaxVal(id INT,VALUE INT,OtherCol CHAR(1))
- INSERT #MaxVal VALUES(1,1,'A')
- INSERT #MaxVal VALUES(1,2,'A')
- INSERT #MaxVal VALUES(1,3,'Z')
- INSERT #MaxVal VALUES(2,1,'A')
- INSERT #MaxVal VALUES(2,2,'X')
- INSERT #MaxVal VALUES(2,3,'A')
- INSERT #MaxVal VALUES(3,1,'A')
- INSERT #MaxVal VALUES(3,2,'Y')
If you only are interested in the id plus the maximum value of a column it is pretty easy; you just do MAX and GROUP BY.
- SELECT id,MAX(VALUE) AS VALUE
- FROM #MaxVal
- GROUP BY id
Output
| ID | Value |
| 1 | 3 |
| 2 | 3 |
| 3 | 2 |
If you need the whole row then you join the table with the group by subquery
- SELECT t.* FROM(
- SELECT id,MAX(VALUE) AS MaxValue
- FROM #MaxVal
- GROUP BY id) x
- JOIN #MaxVal t ON x.id =t.id
- AND x.MaxValue =t.VALUE
Output
| ID | Value | OtherCol |
| 3 | 2 | Y |
| 2 | 3 | A |
| 1 | 3 | Z |
Contributed by: --SQLDenis 02:40, 31 May 2008 (GMT)
Part of SQL Server Programming Hacks
Section Ranking, Max etc
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