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sync data from different DB

Author

Topic

peace
Constraint Violating Yak Guru

420 Posts

Posted - 2013-03-25 : 10:20:54

how can i insert new record from DB 1 to DB 2.
if already exist, just need to update to sync it.

i tried this but it doesn't work.

if exists
(select distinct a.* from tableA a
inner join tableB b
on a.col1=b.col1
)

update tableA
set a.col1=b.col1,
a.col2=b.col2

from tableB b

inner join tableA a
on a.col1=b.col1

else

INSERT INTO tableA (col1,col2)
select * from tableB
where not exists (select * from tableA)

TG
Master Smack Fu Yak Hacker

6065 Posts

Posted - 2013-03-25 : 10:55:29

You should let us know why it "doesn't work" - ie: error, incorrect results, etc.

At first glance I'd guess the reason it "doesn't work" your final insert where not exists statement. If there are ANY rows in tableA then the where clause will never be satisfied.

Sql Server 2008 and later offers a MERGE statement. That may be better for you.

Be One with the Optimizer
TG

visakh16
Very Important crosS Applying yaK Herder

52326 Posts

Posted - 2013-03-25 : 11:21:50

it should be


if exists 
(select a.* from tableA a 
inner join tableB b 
on a.col1=b.col1 
)
update tableA
set a.col1=b.col1,
a.col2=b.col2
from tableB b
inner join tableA a
on a.col1=b.col1 
else
INSERT INTO tableA (col1,col2)
select * from tableB b
where not exists (select * from tableA where col1 = b.col1)

------------------------------------------------------------------------------------------------------
SQL Server MVP
http://visakhm.blogspot.com/

peace
Constraint Violating Yak Guru

420 Posts

Posted - 2013-03-25 : 11:26:34

Oh thanks. I missed out here:

.....
else
INSERT INTO tableA (col1,col2)
select * from tableB b
where not exists (select * from tableA
where col1 = b.col1)

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