Hi All,
I have the two following queries alongwith the results. Can anybody
interpret the results (fourth sql) and let me know why it works like this
(fourth sql).
SQL> select * from a;
NUM
- - - - - - -
1
2
3
SQL> select * from b;
NUM1 NUM2
- - - - - - - - - - - -
1 << NUM2 is null in this
record
2 2
3 1
SQL> select NUM, NUM1, NUM2 from a, b
Where nvl(num2,1) = 1 and num=num1(+);
NUM1 NUM2 NUM3
- - - - - - - - - - - - - - - - - -
1 1
3 3 1
SQL> select NUM, NUM1, NUM2 from a, b
Where nvl(num2(+),1) = 1 and num=num1(+);
NUM1 NUM2 NUM3
- - - - - - - - - - - - - - - - - -
1 1
2
3 3 1
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