Update access table

  • Thread starter Thread starter MiRoT
  • Start date Start date
M

MiRoT

i create this sql query to auto-update fields when updatess.kwdikos_pelath =
pelates.kwdikos_pelath, but when i execute it asks me for values like
updatess.poso_kefalaiou and updates.kwdikos_pelath.
Can anyone tell me what is wrong with this code?

UPDATE pelates SET poso_kefalaiou = (SELECT updatess.poso_kefalaiou FROM
updatess WHERE updatess.kwdikos_pelath = pelates.kwdikos_pelath)
WHERE EXISTS (SELECT updatess.poso_kefalaiou FROM updatess WHERE
updatess.kwdikos_pelath = pelates.kwdikos_pelath);

Thanks.
 
I'm not sure what you mean by auto-update fields and how you execute this
query and - more important - against what kind of database backend you are
working. This newsgroup is about ADP and SQL-Server so I suppose that this
query is written in T-SQL and that you are using an ADO call to execute it
against a SQL-Server backend.

To me, your query looks perfectly fine and unless you have made some
spelling error, you should be able to execute it perfectly well on
SQL-Server. If this doesn't work, you should post here the T-SQL statements
used to recreate the tables pelates and updatess along with some data in
them so that people could try to reproduce your result. You should also
mention the version of the SQL-Server and of the ADP projects that you are
using as well as the ADO statement used to execute this query.

As a note, in T-SQL, the EXISTS condition is tested on the presence of
row(s), not on the values of fields, so you should use "SELECT * ..."
instead of "SELECT updatess.poso_kefalaiou ..." for the EXISTS statement.
You should also add a TOP 1 to make sure that the subquery for the SELECT is
always returning a single row:

UPDATE pelates SET poso_kefalaiou = (SELECT TOP 1 updatess.poso_kefalaiou
FROM
updatess WHERE updatess.kwdikos_pelath = pelates.kwdikos_pelath)
WHERE EXISTS (SELECT * FROM updatess WHERE
updatess.kwdikos_pelath = pelates.kwdikos_pelath);

However, these shouldn't be the source of your error in my opinion.

--
Sylvain Lafontaine, ing.
MVP - Windows Live Platform
Email: sylvain2009 sylvainlafontaine com (fill the blanks, no spam please)
Independent consultant and remote programming for Access and SQL-Server
(French)
 
MiRoT said:
i create this sql query to auto-update fields when updatess.kwdikos_pelath =
pelates.kwdikos_pelath, but when i execute it asks me for values like
updatess.poso_kefalaiou and updates.kwdikos_pelath.
Can anyone tell me what is wrong with this code?

UPDATE pelates SET poso_kefalaiou = (SELECT updatess.poso_kefalaiou FROM
updatess WHERE updatess.kwdikos_pelath = pelates.kwdikos_pelath)
WHERE EXISTS (SELECT updatess.poso_kefalaiou FROM updatess WHERE
updatess.kwdikos_pelath = pelates.kwdikos_pelath);

Thanks.
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