[SQL] Help with UPDATE syntax

[Jeff Putsch]

Howdy,

I am porting a bit of code from ORACLE to PostgreSQL 7.1 and am getting stuck on
an update statment. I am NOT a SQL expert, merely a beginner swimming hard,
so any help will be greatly appreciated. The specific query looks like this:

    begin transaction

    update   
        user_group_map map 
    set  
        user_id = 4
    where  
        user_id = 9
        not exists ( 
            select * from  
                user_group_map 
            where 
                user_id = 4 and
                group_id = map.group_id and 
                role = map.role 
        ) 

    commit

There are other updates taking place during the transaction, but this is the
one for which I can't figure out the PostgreSQL equivalent.

I've tried this:

    update
         user_group_map  
    set    
         user_id = 4  
    from user_group_map map  
    where    
         user_id = 9 and   
         not exists (   
             select * from    
                   user_group_map ug2  
             where   
                    user_id = 4 and   
                    ug2.group_id = map.group_id and   
                    ug2.role = map.role);  
    

for the update replacement, but get an error:
   NOTICE:  current transaction is aborted, queries ignored
      until end of transaction block 

As noted earlier, any guidance will be most appreciated.

Thanks,

Jeff.


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