how to use aggregate function in update statement

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I have two tables,itemmaster and stockdetails as follows:
itemmaster:

C#

itemid  availableqty
100        0
101        0
102        0
103        0
104        0
105        0

stockdetails:

C#

itemid   availabelqty  branch
101  	    20  	 1
101 	    30	         2
101         30  	 3
102         90           1
102         80           2
102         20           3
102         30           4
103         40           1
103         30           4
103         50           2
103         70  	 3

i want to update itemmaster table from sum of all stockdetails table availabelqty...

Have any single quries to update that table data's?
after the execution of queries the itemmaste table should be updated like this

C#

itemid  availableqty
100     0
101	80
102	220
103	190
104	0
105	0

i tried this using this query

SQL

update tblitemmaster set availableqty=(select sum(availableqty) from stockdetails where itemid =110)
where ItemID =102

but this is updating at time only one record.I want to update all record.Have any quries to update that table?

Any one please help me.

Posted 22-Sep-13 21:31pm

hebsiboy

Updated 22-Sep-13 21:49pm

Thanks7872

v3

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Maciej Los · Accepted Answer · 2013-09-22T21:42:00

Solution 1

Try something like this:

SQL

UPDATE t1
    SET t1.avaliblequality = t2.avaliblequality
FROM itemmaster AS t1 INNER JOIN (
    SELECT itemid, SUM(avaliblequality) AS avaliblequality
    FROM stockdetails
    GROUP BY itemid
    ) AS t2 ON t1.itemid = t2.itemid

Posted 22-Sep-13 21:42pm

Maciej Los

Comments

Maciej Los 23-Sep-13 4:20am

Please, mark my answer as a solution (green button) to remove your question from "unanswered list".

hebsiboy 23-Sep-13 4:31am

Thank you........\\
It is working fine..

Maciej Los 23-Sep-13 4:37am

Thank you and you're welcome ;)