>I have a table TableA with the following data:
>
>LINE USED
> 1 F
> 2 F
> 3 F
> 95 F
> 96 F
>
>and a table TableB with the following data:
>
>LINE
> 1
> 2
> 3
> 4
>
>and I need to put a 'T' on the USED column when the line's number is the
>same in both tables (in this case, when it is 1, 2 or 3). Of course, there
>are much more numbers and I dont know them.
>
>How I can make an update on TableA when it has the same numbers that TableB
>has?

Hi Walter,

UPDATE TableA TA
SET TA.USED = 'T'
WHERE EXISTS(SELECT * FROM TableB TB
WHERE TA.LINE = TB.LINE)

Set