show duplicates
Hi all please help me understand this simple logic, why join did merge cartision?I joined the table 1 and table 2, who did the same opl_seq for the leg_id. but the join is cartesion and display of the o/p
SELECT opl_seq
FROM s_order_product_leg opl
WHERE leg_id = 'F4287678';
O/P126031589
123903654
SELECT opl_seq
FROM s_opl_link_data_fe fe
WHERE leg_id = 'F4287678';
O/P126031589
123903654
SELECT opl.opl_seq
FROM s_order_product_leg opl, s_opl_link_data_fe fe
WHERE fe.leg_id = 'F4287678' AND fe.leg_id = opl.leg_id
o/p126031589
123903654
126031589
123903654
Why not?
Databases are born to join, they love the joins!
However: you can use DISTINCT or GROUP BY.
select distinct opl.opl_seq
from s_order_product_leg opl
, s_opl_link_data_fe fe
where fe.leg_id = 'F4287678'
and fe.leg_id = opl.leg_id;
select opl.opl_seq
from s_order_product_leg opl
, s_opl_link_data_fe fe
where fe.leg_id = 'F4287678'
and fe.leg_id = opl.leg_id
group by opl.opl_seq
Published by: hoek on November 25, 2009 18:05
Tags: Database
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