I have a query which is running a bit slowly, and I'm wondering if anyone
has a design improvement. Basically it's a series of unions as follows:
Select ID, plan_name from table/view
Where plan_name = 'A'
And rownum = 1
UNION
Select ID, plan_name from table/view
Where plan_name = 'B'
And rownum = 1
UNION
Select ID, plan_name from table/view
Where plan_name = 'C'
And rownum = 1
UNION
Ad infinitum for about 100 iterations.
Any way to write this more efficiently?
Thanks!
---------------------------(end of broadcast)---------------------------
TIP 9: In versions below 8.0, the planner will ignore your desire to
choose an index scan if your joining column's datatypes do not
match
