Need to update column in table from joining the two tables

Question

Hi
i want to update a table by joining two table but i m getting the below error
single row subquery returns more than one value.
i m using following query
update table2
set deposite_date=(select a.deposit_date from table1 a,table2 b
where a.ban=b.ban and (a.deposit_date between b.cy_start_date and b.due_date))
table2
ban due_date cy_start_date deposite_date
100 5/6/2011 22/05/2011
101 7/11/2011 22/05/2011
102 5/25/2011 22/05/2011
table1
ban      deposit_date
100      04/12/2011
100      04/15/2011
102      03/25/2011
101      04/26/2011
101      05/06/2011
101      07/26/2011
can i insert latest deposit_date from table1 which lies between b.cy_start_date and b.due_date
Thanks

Answer 1

Hi,
Welcome to the forum!
876466 wrote:
Hi
i want to update a table by joining two table but i m getting the below error
single row subquery returns more than one value.Exactly!
(   SELECT  a.deposit_date
    FROM    ...returns all deposit_dates.
(   SELECT  MAX (a.deposit_date)
    FROM    ...would return only the latest one.
Also, you need to correlate the sub-query to the main query, so that it only looks for rows with the same ban.
i m using following query
update table2
set deposite_date=(select a.deposit_date from table1 a,table2 b
where a.ban=b.ban and (a.deposit_date between b.cy_start_date and b.due_date))
table2
ban due_date cy_start_date deposite_date
100 5/6/2011 22/05/2011
101 7/11/2011 22/05/2011
102 5/25/2011 22/05/2011
table1
ban      deposit_date
100      04/12/2011
100      04/15/2011
102      03/25/2011
101      04/26/2011
101      05/06/2011
101      07/26/2011
can i insert latest deposit_date from table1 which lies between b.cy_start_date and b.due_datePerhaps you need something like this:
UPDATE  table2     b
SET     deposit_date     =
         (    SELECT  MAX (a.deposit_date)
               FROM      table1           a
           WHERE      a.ban          = b.ban
           AND      a.deposit_date BETWEEN b.cy_start_date
                           AND     b.due_date
;Notice that table1 is the only table in the FROM clause of the sub-query, but the sub-query is correlated to table2, so we can reference columns from table2 in the sub-query.
Whenever you have a problem, post CREATE TABLE and INSERT statements for your sample data.
Also post the results you want from that data, and an explanation of how you get those results from that data, with specific examples.
If you're asking about a DML statement, such as UPDATE, the CREATE TABLE and INSERT statements should re-create the tables as they are before the DML, and the results will be the contents of the changed table(s) when everything is finished.
Always say which version of Oracle you're using.
Edited by: Frank Kulash on Aug 1, 2011 1:58 PM