INSERT INTO with SELECT - SQL Server Forums

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INSERT INTO with SELECT

Author

Topic

dcarva
Posting Yak Master

140 Posts

Posted - 2011-08-10 : 22:24:28

Hello,

I need to perform an INSERT INTO and make sure that it does not insert duplicates that may already be in the row. Ex:

insert into table1 (field1, field2, field3)
select uc.field1, uc.field2, uc.field3
from table2

Some records in table2 already exist in table1. In above inserts, I don't want it to insert duplicate records into table1.

Thanks!

khtan
In (Som, Ni, Yak)

17689 Posts

Posted - 2011-08-10 : 22:27:17

you can check for existence of record using NOT EXISTS


insert into table1 . . .
from   table2 t2
where  not exists (select * from table1 x where x.pk = t2.pk)

KH
[spoiler]Time is always against us[/spoiler]

dcarva
Posting Yak Master

140 Posts

Posted - 2011-08-10 : 23:14:15

Thank you!

That helped. I initially tried something similar and I could not get it to work. I ended up:

insert into table1 (field1, field2, field3)
select uc.field1, uc.field2, uc.field3
from table2
where NOT exists(select field1, field2, field3
from table1 t1
where t1.field1=t2.field1 and t1.field2 = t2.field2 and t1.field3=t2.field3)

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