Answer / infant gerald

Join is a And Statement of a where clause
Unios is an Or Statemen of matching datatype

Answer / krish

how to fine top 3 emp(sal) from each deptno
i want the out put like this
sal deptno
100 20
200 20
300 20
150 30
250 30
350 30
so top 3 from each dept
thank u

Answer / vishnu e s

join-is used to join two tables which have the same field
and same data type.
union-is to join two sql querrys....

Answer / sompalli krishna

Join: joins are used to combine the columns from one or
more tables(join using one table is possible for self
join).output should B more than one column.
It is constraint based.Columns r joined based on similar
column names and datatypes also on both the tables.

union: union is used to combine the columns from one or
more tables.Output should B one column.
It is not constraint based.Any no. of columns can be
combined without using any condition.But the data types
should be same immaterial to column names.
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Answer / vijay kulkarni

In Join, matching rows are joined side-by-side to make the
result table but whereas in Union rows are joined one-below
the other to make the result table.

Answer / sat kumar

Union:- Union return the common data in the form of rows

Join:- Joins always returncommon Data in the form of Column
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Answer / venki

A join is used to combine rows from multiple tables. A join
is performed whenever two or more tables is listed in the
FROM clause of an SQL statement.


Combines the results of two SELECT statements into one
result set, and then eliminates any duplicate rows from
that result set

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