Question

I want to update multiple rows that have specific count number (count(*)=2) with number 40. Consider the following example:

create table test(id int not null primary key, day date not null, tst int not null  );
insert into test(id, day, tst) values(1, '2006-10-08', 0);

insert into test(id, day, tst) values(2, '2006-10-08', 0);

insert into test(id, day,tst) values(3, '2006-10-09', 0);

I have used the following query UPDATE test SET tst = 40 WHERE (select day from test GROUP BY day having count(*)=2);

But it never works. Any help please…

Thanks.

Aymen

Answer 1

Thanks God… Finally, we came up with working query:

UPDATE test1 SET tst = 40 WHERE EXISTS (SELECT day FROM (SELECT day from test1 ) 
AS tmpb WHERE test1.day = tmpb.day GROUP BY day HAVING COUNT(*) = 2)