Question

sql - full record update w/o each field defined

Asked by: dcass

I have to update all records if duplicates in table, but don't have to type in 100 variables and worry about table design changes.  Is there any way to do this without specified each record in ASP (html/vbscript)?

if UpdateNotesFlag = "1" then 
 ' update other records for (multiple records) with new changes
        dupctr = 0
        SQL = "SELECT var1,id FROM OContacts WHERE var1 = '" + CustName + "'"
        SQL_Rs.open SQL,SQL_Cn,3
        if SQL_Rs.RecordCount > 1 then
            dupctr = cint(SQL_rs.recordcount)
        end if
        SQL_rs.close
        if dupctr > 1 then
              SQL = "update OContacts set var5='"+var5sv+"' where var1='" + CustName + "'"
              SQL_Rs.open SQL,SQL_Cn,3
        end if  
 end if

                                  
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Asked On
2009-10-20 at 07:56:37ID24827119
Tags

sql

Topic

SQL Query Syntax

Participating Experts
2
Points
500
Comments
5

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Answers

 

by: BrandonGalderisiPosted on 2009-10-20 at 20:02:10ID: 25620541

You can read the table definition by querying information_schema.columns to get the list of columns.  But you have to specify column names on update.

 

by: mark_willsPosted on 2009-10-20 at 20:28:57ID: 25620629

If the duplicate is being determined by "custname" (rather the column var1) and it looks like there is an ID in there as well, then you can update all dupes in one hit...

Doing what you are currently doing will update every instance of the duplicate to have the same values in var5 - not really getting rid of duplicates, just making all duplicates the same var5 value - is that what you are really trying to do ?

Normally when there is an ID, can run duplicate testing like :

select var1, id
from Ocontacts
where id <> (select max(id) from ocontacts c where c.var1 = ocontacts.var1)

That way it preserves the max(id) and shows the lesser ID's for the same var1 - and it will report on the entire table at the same time...

So, what you might typically do is to "manage" the duplicates leaving one "real" one something like :

update Ocontacts set var5 = 'This is old and a dupe'
from Ocontacts  
where id <> (select max(id) from ocontacts c where c.var1 = ocontacts.var1)


Does that make sense ?

 

by: dcassPosted on 2009-10-21 at 09:03:58ID: 25625343

Sorry - I wasn't very clear.
It's not the duplicates that are the problem, it's having to type in 100 + variables to update.
Just wondering if there is an easier way to update that will update all variables without having to type them all in on the update statement.

 

by: dcassPosted on 2009-10-28 at 21:04:18ID: 25690572

No satisfactory answer.

 

by: mark_willsPosted on 2009-10-29 at 04:06:56ID: 25692316

It is not so much as there is no satisfactory answer as much as what you are asking is not readily possible without considerably more effort than the 100+ variables to update.

You can use dynamic SQL to get the list of columns - hence possible variable names, but somewhere you will need to "match" them up...

If you could give a better example of what you are trying to do - with say 5 "variables" then we might be able to better understand what you are really asking.

20120131-EE-VQP-002

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