Thread: new calculated column

new calculated column

From
andres javier garcia garcia
Date:
Hi;

I've got a table with two fields and about 3000 rows, the second one is a 
character field, what can have about twenty different values; of course these 
values are repeated a lot of times in the table. I need to create a new 
column of type integer, whose value depens on the character fields. The 
values of the new column are not important, the important thing is who can I 
create this column and assign a different integer to a different char value 
in the other column.
Thanks
--------------
Javier


Re: new calculated column

From
Viacheslav N Tararin
Date:
For implicit modification you can use a trigger on the table. If you 
wan't store this data, you can use view.

andres javier garcia garcia ?????:

>Hi;
>
>I've got a table with two fields and about 3000 rows, the second one is a 
>character field, what can have about twenty different values; of course these 
>values are repeated a lot of times in the table. I need to create a new 
>column of type integer, whose value depens on the character fields. The 
>values of the new column are not important, the important thing is who can I 
>create this column and assign a different integer to a different char value 
>in the other column.
>Thanks
>--------------
>Javier
>
>---------------------------(end of broadcast)---------------------------
>TIP 3: if posting/reading through Usenet, please send an appropriate
>subscribe-nomail command to majordomo@postgresql.org so that your
>message can get through to the mailing list cleanly
>
>
>  
>