What is the difference between join and union.
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Answer Posted / nitin
for SET operators the resultant column set should be same for the tables.
i.e.
select * from boy
union
select * from girl
will give an error if they have different column
but in join you can corellete the column to each other.
select * from boy,girl where boy.id_gender=girl.id_gender;
will give result
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