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Correlated Update

Author

Topic

Cyclonik
Posting Yak Master

114 Posts

Posted - 2006-01-26 : 14:38:46

What is the correct syntax for a correlated update in SQL Server?

Here is the Oracle syntax which does not work in SQL Server 2k:

UPDATE table1 t_alias1
SET column = (
SELECT expr
FROM table2 t_alias2
WHERE t_alias1.column = t_alias2.column);

Srinika
Master Smack Fu Yak Hacker

1378 Posts

Posted - 2006-01-26 : 14:45:37

UPDATE table1
SET t_alias1.column = t_alias2.expr
FROM table1 t_alias1, table2 t_alias2
WHERE t_alias1.column = t_alias2.column

khtan
In (Som, Ni, Yak)

17689 Posts

Posted - 2006-01-26 : 19:56:28

Or use the table alias name in the UPDATE

UPDATE t_alias1
SET    t_alias1.column = t_alias2.expr
FROM   table1 t_alias1, table2 t_alias2
WHERE  t_alias1.column = t_alias2.column

----------------------------------
'KH'

Michael Valentine Jones
Yak DBA Kernel (pronounced Colonel)

7020 Posts

Posted - 2006-01-26 : 20:56:05

I prefer using INNER JOIN syntax:


update  table1 
set
	columna = table2.expr
from
	table1
	inner join
	table2
	on table1.column1 = table2.column1

CODO ERGO SUM

madhivanan
Premature Yak Congratulator

22864 Posts

Posted - 2006-01-27 : 01:29:37

Also I prefer using Alias names when you use JOINs


update  t1
set
	t1.columna = t2.expr
from
	table1 t1
	inner join
	table2 t2
	on t1.column1 = t2.column1

Madhivanan

Failing to plan is Planning to fail

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