Hi

can any one tell me the difference between "union all" and "full outer join"

thanks in advance

The output record set in union all contains same number of columns as in the input tables. But it concatenates all the records of both the input tables in the output. Both the input tables should have the same number of columns and same data types for those columns.

But the full outer join concatenates the columns in both the table. No need for the input tables to have same number of records.

Hi Barbie

That was a significant input thank you

UNION ALL: there is restriction for set operators, i.e. the columns in query 1 must match the columns in query2 in data type,order and number.

some e.g.:
display those who are emp as well managers(INTERSECT)
display those who are not managers (MINUS)
display those depts which do not have emp(MINUS)
dispaly those depts which have emp(INTERSECT) try these......


OUTER-JOIN: used on those tables that keep common columns just like EQUI-JION. but, the o/p will display some extra information which is available in only one of the two tables......

E.G.:
display emp details along with coressponding department details and also display that department details which there are no emp....

than q
sateesh

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