Delete data from two tables at a time

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SQL-Server-2008R2

Table 1

OMID   ORDERNO
19     ORD-2222-REE
20     ORD-2223-REE

Table 2

ID  ORDERNOREF ITEM
1   19         A
2   20         B

This is my two table in sql.
In front i am selecting the ORDERNO from combo box.

Please tell me how to write the delete query to delete values from both the tables at a time.

Thank you

Posted 12-Nov-13 1:08am

SnehasishN

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♥…ЯҠ…♥ 12-Nov-13 7:48am

Which is parent table and child table?

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Ashish_Agrawal · Answer 1 · 2013-11-12T01:39:00

It is not possible to delete reocrds from multiple tables at once. A DML statement can affect only one table.
You can do this by following statements.

SQL

DELETE 
FROM T2 
Inner JOIN T1 ON T2.ORDERNOREF = T1.OMID
Where T1.ORDERNO = @ORDERNO

DELETE FROM T1 Where ORDERNO = @ORDERNO.

You can use a stored procedure to execute these statements.

Pheonyx · Answer 2 · 2013-11-12T01:17:00

Have you tried anything? I'm guessing not.

Here are some tips rather than a complete solution.

Use the order number to find the OMID.
Delete from Table 2 where ORDERNOREF = OMID
Delete from Table 1 where OMID = OMID

Another option would be to define a relationship in SQL, so that when you delete from table 1 the delete cascades to table 2, in turn deleting the lines.

The third option, is a take on the first one where you

delete from table 2 where ORDERNOREF in (Select OMID from Table 1 where ORDERNO = your selected value)
delete from table 1 where ORDERNO = your selected value

prashant patil 4987 · Answer 3 · 2013-11-12T01:17:00

Solution 2

try this

SQL

DELETE FROM TABLE_1 WHERE ORDERNOREF = 19;
DELETE FROM TABLE_2 WHERE OMID  = 19

Posted 12-Nov-13 1:17am

prashant patil 4987

v2

OriginalGriff · Answer 4 · 2013-11-12T01:18:00

Solution 3

Try:

SQL

DELETE t1,t2 FROM Table1 t1 JOIN Table2 t2 ON t1.OMID=t2.ORDERNOREF WHERE t1.ORDERNO='ORD-2222-REE'

Posted 12-Nov-13 1:18am

OriginalGriff

Comments

[no name] 12-Nov-13 7:53am

Griff it's giving error saying "Invalid object near t1"

OriginalGriff 12-Nov-13 8:16am

Sorry - That's MySql syntax, not MsSql - you can't do that in MsSql.
The best way would be to create a stored procedure to both deletes independently, inside a transaction so that if one fails, you can roll them both back - MsSql will not allow you to do multiple deletes in a single command (except cascade deletes) unfortunately.

Brain failure on my part - I need more coffee!

[no name] 12-Nov-13 23:14pm

:)

Delete data from two tables at a time

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