oracle - Difference of NOT IN and NOT EQUALS different behaviour in SQL query -



oracle - Difference of NOT IN and NOT EQUALS different behaviour in SQL query -

i thought not in behaves same != in query. query using != returns more rows query using not in:

select count(a.no) a.code != 'a' , a.code != 'b' , a.code != 'c' , a.name != 'd' , a.name != 'e'

returns 1566 rows, whereas

select count(a.no) a.code not in ('a','b','c') , a.name not in ('d','e')

returns 1200 rows.

i suppose not in excludes null values - difference?

i have tried replecate problem using this simplified sql fiddle, however, returns same number both versions.

what differant data?

sql oracle

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