Question

How to update a table from another table using a stored procedure

Asked by: webprouk

I need to write a stored procedure that goes through each record in Table A and checks if it is present in Table B. If it is present update the record in Table B, if not present, insert the record into Table B. I'm using MS SQL 2000.

Thanks

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Asked On
2008-04-17 at 09:22:10ID23331528
Tags

mssql

Topics

SQL Query Syntax

,

MS SQL Server

Participating Experts
3
Points
500
Comments
5

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Answers

 

by: chapmandewPosted on 2008-04-17 at 09:27:00ID: 21378839

this should do it..you have to update then insert..2 statements.

create proc myproc
as
begin
update b
set fieldname = a.fieldname
from tablea a
join tableb b on a.pkey = b.pkey

insert into tableb
select a.*
from tablea a
left join tableb b on a.pkey = b.pkey
where b.pkey is null
end

 

by: jogosPosted on 2008-04-17 at 09:27:47ID: 21378849

when column C1 is the joining-column between tableA and table B

-- Update the existing
Update tableB
set TableB.c2 = TableA.C2
from tableB
inner join tableA on tableA.C1 = tableB.C1
where 
--- Insert when not existing
insert into tableB (c1,C2)
select  c1,c2
from tableA
where not exists in (select * from tableB where tableB.C1 = tableA.C1 )
                                              
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Select allOpen in new window

 

by: aneeshattingalPosted on 2008-04-17 at 09:28:15ID: 21378859

create proc testSp
@value1 int
,@Key int
as

set nocount on
update t
set Valu = @Value
where Key = @Key
if @@RoWCOUNT = 0
 insert into urTable select @Key,@value

 

by: jogosPosted on 2008-04-17 at 09:55:09ID: 21379094

the solllution fo aneeshattingal will only work if you want to update 1 specific  record

When you execute it in a loop record per record it will be very much slower as the first two.
and now I see that I forgot a little thing in the WHERE

-- Update the existing (and don't update if the result already has the right value (pretending there are no NULL-values in either column)
Update tableB
set TableB.c2 = TableA.C2
from tableB
inner join tableA on tableA.C1 = tableB.C1
where TableB.c2 <> TableA.C2

 

by: webproukPosted on 2008-04-18 at 02:54:44ID: 21384396

thanks everyone, i went with jogos solution as it was the easiest to follow, had to make 1 small change to remove the word "in" from the line : where not exists in (select * from tableB where tableB.C1 = tableA.C1 )

20120131-EE-VQP-002

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