Error in update statement

Question

Hai All
update dail set timeout=out_time where attend_date=r1.bardate and
(select bar_code from empl_barcode where empl_barcode.barcode=r1.barcode);
I got an error in my update statement. How can i write update statement with this or where i change..
Regards
Srikkanth.M

Answer 1

Hi,
review the syntax for the UNDATE statement. The following is okay:
UPDATE     dail
SET     timeout          = out_time
WHERE     attend_date     = x
AND     y          > z
;if all the columns (including x, y and z) are in dail.
If you need to get some of those values from another table, then you can do a scalar sub-query , that is, a query that returns 9at most) one row, enclosed in parentheses.
For example, if x is in another table (named r1), you might say:
UPDATE     dail     m
SET     timeout          = out_time
WHERE     attend_date     = (     -- Begin scalar sub-query
                    SELECT     MAX (bardate)
                    FROM     r1
                    WHERE     dail_id     = m.id
                 )     -- End scalar sub-query
AND     y          > z
;It looks like you're trying to do something similar.
I'm not sure exactly what x is supposed to be, and you're missing y (or z) as well as the operator between them.
MERGE is often easier to use than UPDATE, when you need to reference other tables.
If you'd like help, post a little sample data (CREATE TABLE and INSERT statements for all tables as they exist before the UPDATE) and the results you want from taht data (the contents of dail after the UPDATE).