Question

Need help with complex query

Asked by: WNE

Hi,

I need help with a SQL query. I have two tables one with two fields named "Filename" and "Xref". The other table has "Main file" and "referenced file" as fields. I need to compare the "Xref" field with "referenced file" field. If they don't match i need to write a error message to another field so it must be a update query.

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Asked On
2002-09-05 at 01:24:12ID20350982
Tags

fields

,

update

,

xref

Topic

Visual Basic Programming

Participating Experts
3
Points
200
Comments
11

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Answers

 

by: nickwoolleyPosted on 2002-09-05 at 01:53:53ID: 7263938

Are you working with an Access database?

You might like to try the following, where field? is the 'another field' you want to update:

UPDATE [table?].[field?] LEFT JOIN [table2] ON [table1].[Xref] = [table2].[referenced file]
 SET [table?].[field?] = [table1].[Xref]
WHERE ((([table2].[referenced file]) Is Null))

 

by: khalikPosted on 2002-09-05 at 02:15:41ID: 7263979


try this

update table1 set err_msg = "No Match" from table1 ,table2 where filename=mainfile and xref<>referencedfile

 this will update the table 1 which i hope has the field for error message i give it a name err_msg with "No Match" where the file names are same and the ref file no same.

 

by: jeffstattPosted on 2002-09-05 at 08:52:53ID: 7264840

What specifically are your table and field names?
Is this SQL Server, Oracle or Access?

 

by: WNEPosted on 2002-09-05 at 23:51:13ID: 7266496

Table 1 is called "Xrefs" and table 2 "Index" and the "other" field is located in the "index" table and is called "errormessage". And the "filename" and "main file" field also have to match. So if i have a record in the "index" table where the "main file" is "Drawing1.dwg". I have to look in the "xrefs" table for a record where the "filename" field has the same value. Then i have to check if the "referenced file" field has the same value as the "xref" field.

I try to do this in Acces.

 

by: WNEPosted on 2002-09-05 at 23:52:35ID: 7266498

Nickwoolley and khalik,

Your query's don't work.

 

by: WNEPosted on 2002-09-06 at 00:07:41ID: 7266513

Nickwoolley and khalik,

Your query's don't work.

 

by: nickwoolleyPosted on 2002-09-06 at 01:47:47ID: 7266607

If you'd like to send a zipped copy of your DB's with half a dozen records in to nick65_uk@yahoo.co.uk then I will take another look for you.

 

by: nickwoolleyPosted on 2002-09-06 at 06:22:54ID: 7267110

WNE,

Try pasting the following into the SQL view of an Access query, it should update 3 records.

UPDATE Xrefs INNER JOIN [Index] ON Xrefs.Filename = Index.[Main file] SET [Index].ErrorMessage = "No Match"
WHERE (((Index.[Referenced file 1])<>[Xrefs].[Xref]));

 

by: nickwoolleyPosted on 2002-09-06 at 06:31:26ID: 7267136

This should work too:

UPDATE Xrefs, [Index] SET [Index].ErrorMessage = "No Match"
WHERE (((Xrefs.Filename)=[Index].[Main file]) AND ((Index.[Referenced file 1])<>[Xrefs].[Xref]));

I believe this may be processed quicker than using a join.

 

by: WNEPosted on 2002-09-06 at 06:52:38ID: 7267202

Thanks for the query's. They work pefectly.

 

by: nickwoolleyPosted on 2002-09-06 at 07:10:32ID: 7267240

Glad to be of some help.

20120131-EE-VQP-002

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