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Delete after comparing b/w two tables

 
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chan2004

New User


Joined: 28 Mar 2007
Posts: 16
Location: India

PostPosted: Mon May 05, 2008 12:34 pm    Post subject: Delete after comparing b/w two tables
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Hi,

I want to delete all records from a table A after comparing it with another table,B.
Both tables have same structure.
They have a column called 'name'.
if a row is there that contains a value of 'john' in name field of table A and there is no such value in table B, i need to delete it from table A
how to delete all such rows with one sql command?
will this sql work

DELETE FROM tableA
WHERE
ID = :id
AND
NAME not in
(SELECT NAME FROM tableB)
;

will this delete all rows?
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guptae

Moderator


Joined: 14 Oct 2005
Posts: 1187
Location: Bangalore,India

PostPosted: Mon May 05, 2008 12:43 pm    Post subject:
Reply with quote

Hello Chan,

I have just viewing ur query but unable to understand why u have used ID Col.

Quote:
DELETE FROM tableA
WHERE
Code:
ID = :id

AND
NAME not in
(SELECT NAME FROM tableB)
;


I think below query is sufficent

Code:
DELETE FROM tableA
WHERE
NAME not in
(SELECT NAME FROM tableB)
;
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chan2004

New User


Joined: 28 Mar 2007
Posts: 16
Location: India

PostPosted: Mon May 05, 2008 1:21 pm    Post subject:
Reply with quote

[quote="guptae"]Hello Chan,

I have just viewing ur query but unable to understand why u have used ID Col.

Quote:
DELETE FROM tableA
WHERE
Code:
ID = :id

AND
NAME not in
(SELECT NAME FROM tableB)
;


I think below query is sufficent

thanks ekta for confirming the query
the id is just another condition that i need to check before deleting icon_smile.gif
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