Question

I have to do an UPDATE table that includes a SELECT COUNT but that takes way too long.
That was my original query

 UPDATE list SET count = 
 (SELECT COUNT(*) FROM set_1 WHERE set_1.start BETWEEN list.start AND list.end); 

I just have 100 rows to update so I was thinking of just do a select count and display it on screen. And then I’ll copy/paste the result on my excel spreadsheet.

I was intended to do this, but it returns only one number (and not 100 rows of number)

 SELECT COUNT(*) FROM set_1,list WHERE set_1.start BETWEEN list.start AND list.end;

But that doesn’t work it returns one big number of all the SELECT COUNT together ..

Anyone can help me out with this ?

Answer 1

You are doing a cartesian product between set1 and list

select        
   (SELECT COUNT(*) FROM set_1 
         WHERE set_1.start BETWEEN list.start AND list.end) as [count]
from list