How do I write Update Query with Multiple Conditions.

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I have following Account table

Acct_ID     AM_ID    DM_ID    Userfield
111          1          2         Null
123          3          4         Null
321          5          6         Null

and so on....

I want to Update AM_ID in DM_ID and DM_ID in Userfield.
Please let me know how can i do it.
Here Acct_ID is primary Key.
What can be possible Update Query.

Posted 7-Oct-14 5:14am

lovejeet0707

Updated 7-Oct-14 6:00am

Maciej Los

v2

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Herman<T>.Instance 7-Oct-14 11:15am

What have you tried?

[no name] 7-Oct-14 11:46am

where is your query

2 solutions

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PhilLenoir · Answer 1 · 2014-10-07T06:05:00

Solution 1

Your English isn't clear, but if I understand that you want to set the DM_ID field to the AM_ID value and the UserField to the DM_ID value? If so:

SQL

UPDATE Account
SET DM_ID = AM_ID, Userfield = DM_ID

This updates all rows. If you want to update a specific row:

SQL

UPDATE Account
SET DM_ID = AM_ID, Userfield = DM_ID
WHERE Acct_ID = SomeValue

Posted 7-Oct-14 6:05am

PhilLenoir

Comments

Maciej Los 7-Oct-14 13:02pm

+5!
Have a look at my answer ;)

King Fisher 8-Oct-14 0:43am

clear one . +5

Maciej Los · Answer 2 · 2014-10-07T06:05:00

I'm not sure understand you correctly, but..

Below query replaces NULL in UserField with DM_ID values.

SQL

UPDATE t1 SET t1.Userfield = t2.DM_ID, t1.DM_ID = t2.AM_ID 
FROM dbo.Account AS t1 INNER JOIN Account AS t2 ON t1.Acct_ID = t2.Acct_ID

Fully working sample:

SQL

DECLARE @Account TABLE (Acct_ID INT, AM_ID INT, DM_ID INT, Userfield INT NULL)

INSERT INTO @Account (Acct_ID, AM_ID, DM_ID)
VALUES(111, 1, 2),
(123, 3, 4),
(321, 5, 6)

SELECT *
FROM @Account

UPDATE t1 SET t1.Userfield = t2.DM_ID, t1.DM_ID = t2.AM_ID
FROM @Account AS t1 INNER JOIN @Account AS t2 ON t1.Acct_ID = t2.Acct_ID

SELECT *
FROM @Account

Results:
1. query

111 1   2   NULL
123 3   4   NULL
321 5   6   NULL

2. query

111 1   1   2
123 3   3   4
321 5   5   6