SQL Clone
SQLServerCentral is supported by Redgate
 
Log in  ::  Register  ::  Not logged in
 
 
 


update MySQL from SQL Server


update MySQL from SQL Server

Author
Message
martin.kerr 34088
martin.kerr 34088
Old Hand
Old Hand (348 reputation)Old Hand (348 reputation)Old Hand (348 reputation)Old Hand (348 reputation)Old Hand (348 reputation)Old Hand (348 reputation)Old Hand (348 reputation)Old Hand (348 reputation)

Group: General Forum Members
Points: 348 Visits: 94
Hi All,

I have managed to set up a linked server to a MySQL database and i want to update the MySQL database using a table within SQL Server. I tried the below code:
UPDATE OPENQUERY(DQ_TESTDATA,'select webmaster_id, dupe_master_id, dupe_flag from webmaster')
SET dupe_master_id = r.MID,
dupe_flag = 'M'
FROM (Select * from dbo.DQResults) as r INNER JOIN
OPENQUERY(DQ_TESTDATA,'select webmaster_id from webmaster') AS w
ON r.MID = w.webmaster_id


but it updated every record in the database (just over 2 million).
it should only be updating around 662510.

Can anyone see why this is happening and what the SQL update query should be?

Thanks
Lowell
Lowell
SSC Guru
SSC Guru (69K reputation)SSC Guru (69K reputation)SSC Guru (69K reputation)SSC Guru (69K reputation)SSC Guru (69K reputation)SSC Guru (69K reputation)SSC Guru (69K reputation)SSC Guru (69K reputation)

Group: General Forum Members
Points: 69870 Visits: 40918
martin.kerr 34088 (5/13/2013)
Hi All,

I have managed to set up a linked server to a MySQL database and i want to update the MySQL database using a table within SQL Server. I tried the below code:
UPDATE OPENQUERY(DQ_TESTDATA,'select webmaster_id, dupe_master_id, dupe_flag from webmaster')
SET dupe_master_id = r.MID,
dupe_flag = 'M'
FROM (Select * from dbo.DQResults) as r INNER JOIN
OPENQUERY(DQ_TESTDATA,'select webmaster_id from webmaster') AS w
ON r.MID = w.webmaster_id


but it updated every record in the database (just over 2 million).
it should only be updating around 662510.

Can anyone see why this is happening and what the SQL update query should be?

Thanks


there's no WHERE statement to discriminate/filter which rows you want to affect.

don't you need something like

WHERE dupe_master_id = r.MID
AND dupe_flag <> 'M'



so it only affects the rows that are not yet "M" for the dupe_flag?

Lowell
--help us help you! If you post a question, make sure you include a CREATE TABLE... statement and INSERT INTO... statement into that table to give the volunteers here representative data. with your description of the problem, we can provide a tested, verifiable solution to your question! asking the question the right way gets you a tested answer the fastest way possible!
Go


Permissions

You can't post new topics.
You can't post topic replies.
You can't post new polls.
You can't post replies to polls.
You can't edit your own topics.
You can't delete your own topics.
You can't edit other topics.
You can't delete other topics.
You can't edit your own posts.
You can't edit other posts.
You can't delete your own posts.
You can't delete other posts.
You can't post events.
You can't edit your own events.
You can't edit other events.
You can't delete your own events.
You can't delete other events.
You can't send private messages.
You can't send emails.
You can read topics.
You can't vote in polls.
You can't upload attachments.
You can download attachments.
You can't post HTML code.
You can't edit HTML code.
You can't post IFCode.
You can't post JavaScript.
You can post emoticons.
You can't post or upload images.

Select a forum

































































































































































SQLServerCentral


Search