Newbie: UPDATE a Table

Xref: TK2MSFTNGP08.phx.gbl microsoft.public.sqlserver.programming:529989
Hi,
I want to insert some new data in a Table. There is a possibility that there
are duplicate rows .
An Insert is obviously not allowed due to PK violatons.
The new data reside on a temporary Table and there are NO duplicates!
Will an Update do?
I simply want to :
"If the row exists replace it, if not insert the new one"
TIA
-steveIf you know you are replacing the old rows when you have a match, then
why not just delete them and then insert this scrubbed data, like this?
BEGIN
DELETE FROM Foo
WHERE Foo.key_col
IN (SELECT key_col FROM Bar);
INSERT INTO Foo
SELECT * FROM Bar;
END;|||Ok, thanx!
But, for info, there is no command that will do this in one step ?
and in my case the PK consists of multiple columns. However i get an error:
DELETE FROM tblMeasQAHor
WHERE
(tblMeasQAHor.MENVid, tblMeasQAHor.date_time, tblMeasQAHor.CodePol,
tblMeasQAHor.Valide, tblMeasQAHor.val)
IN
(SELECT MENVid, date_time, CodePol, Valide, val FROM tempQAHor)
why? i tried a few combinations and it doesn't work. If i only leave one
column then it's OK.
TIA
"--CELKO--" <jcelko212@.earthlink.net> a crit dans le message de news:
1117220035.893367.120570@.g14g2000cwa.googlegroups.com...
> If you know you are replacing the old rows when you have a match, then
> why not just delete them and then insert this scrubbed data, like this?
>
> BEGIN
> DELETE FROM Foo
> WHERE Foo.key_col
> IN (SELECT key_col FROM Bar);
> INSERT INTO Foo
> SELECT * FROM Bar;
> END;
>|||You'll need to do this in 2 steps. Delete then Insert
For the delete, test this out before you execute it on production code.
Replace temp1
with whatever your temp table name is
DELETE FROM tblMeasQAHor
FROM tblMeasQAHor t1
JOIN temp1 t2 on t1.MENVid = t2.MENVid
AND t1.date_time = t2.date_time
AND t1.CodePol = t2.CodePol
AND t1.Valide = t2.Valide
AND t1.val = t2.val
"steve" <steve@.here.com> wrote in message
news:n1Lle.40566$8j3.864446@.weber.videotron.net...
> Ok, thanx!
> But, for info, there is no command that will do this in one step ?
> and in my case the PK consists of multiple columns. However i get an
error:
> DELETE FROM tblMeasQAHor
> WHERE
> (tblMeasQAHor.MENVid, tblMeasQAHor.date_time, tblMeasQAHor.CodePol,
> tblMeasQAHor.Valide, tblMeasQAHor.val)
> IN
> (SELECT MENVid, date_time, CodePol, Valide, val FROM tempQAHor)
>
> why? i tried a few combinations and it doesn't work. If i only leave one
> column then it's OK.
> TIA
> "--CELKO--" <jcelko212@.earthlink.net> a crit dans le message de news:
> 1117220035.893367.120570@.g14g2000cwa.googlegroups.com...
>|||I just want to clarify. If you want to do it the way Joe recommends, you'll
need to do it in 2 steps. You could also do a correlated subquery
(untested)
INSERT INTO tblMeasQAHor
SELECT *
FROM temp1 t1
WHERE NOT EXISTS (
SELECT 'X' FROM tblMeasQAHor t2 WHERE t1.MENVid = t2.MENVid
AND t1.date_time = t2.date_time
AND t1.CodePol = t2.CodePol
AND t1.Valide = t2.Valide
AND t1.val = t2.val)
I'm not sure which you prefer. Also, I generally recommend using column
names in the insert and select. I don't know what the table looks like
structurally so I went with the select * approach.
"Armando Prato" <aprato@.REMOVEMEkronos.com> wrote in message
news:eY77X9vYFHA.3712@.TK2MSFTNGP09.phx.gbl...
> You'll need to do this in 2 steps. Delete then Insert
> For the delete, test this out before you execute it on production code.
> Replace temp1
> with whatever your temp table name is
> DELETE FROM tblMeasQAHor
> FROM tblMeasQAHor t1
> JOIN temp1 t2 on t1.MENVid = t2.MENVid
> AND t1.date_time = t2.date_time
> AND t1.CodePol = t2.CodePol
> AND t1.Valide = t2.Valide
> AND t1.val = t2.val
>
> "steve" <steve@.here.com> wrote in message
> news:n1Lle.40566$8j3.864446@.weber.videotron.net...
> error:
this?
>