how to find count over rows selected by union

Question

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how to find count over rows selected by union .

My sql Query is:

SQL

select Table1.ID,Table1.RollNo
from 
Table1 inner join Table2 on Table1.RollNo = Table2.RollNo and Table1.ID = Table2.ID
where Table1.Subject='Maths' and Table2.Category='Complusary'
union
select Table1.ID,Table1.RollNo
from
Table1 inner join Table2 on Table1.RollNo = Table2.RollNo and Table1.ID = Table2.ID
where Table1.Subject='Maths' and Table2.Category='Elective'

It reurns two rows i want output like
Count
2

Posted 31-Jul-12 0:51am

Pratika05

Updated 31-Jul-12 0:53am

Kenneth Haugland

v3

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3 solutions

Solution 3

Actually there are no need to use Union first of all try this.

SQL

select Table1.ID,Table1.RollNo
from
Table1 inner join Table2 on Table1.RollNo = Table2.RollNo and Table1.ID = Table2.ID
where (Table1.Subject='Maths' and (Table2.Category='Complusary' or Table2.Category='Elective')

and also this

SQL

select Table1.ID,Table1.RollNo
from
Table1 inner join Table2 on Table1.RollNo = Table2.RollNo and Table1.ID = Table2.ID
where Table1.Subject='Maths' and Table2.Category in ('Complusary','Elective')

Posted 31-Jul-12 1:15am

Santhosh Kumar Jayaraman

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Santhosh Kumar Jayaraman · Accepted Answer · 2012-07-31T01:03:00

SQL

with Cte_Test as 
select Table1.ID,Table1.RollNo
from
Table1 inner join Table2 on Table1.RollNo = Table2.RollNo and Table1.ID = Table2.ID
where Table1.Subject='Maths' and Table2.Category='Complusary'
union
select Table1.ID,Table1.RollNo
from
Table1 inner join Table2 on Table1.RollNo = Table2.RollNo and Table1.ID = Table2.ID
where Table1.Subject='Maths' and Table2.Category='Elective')
select count(1) from cte_test

or something like this

SQL

Select count(1) from (select Table1.ID,Table1.RollNo
from
Table1 inner join Table2 on Table1.RollNo = Table2.RollNo and Table1.ID = Table2.ID
where Table1.Subject='Maths' and Table2.Category='Complusary'
union
select Table1.ID,Table1.RollNo
from
Table1 inner join Table2 on Table1.RollNo = Table2.RollNo and Table1.ID = Table2.ID
where Table1.Subject='Maths' and Table2.Category='Elective')as  A

Sebastian T Xavier · Accepted Answer · 2012-07-31T01:04:00

Try it as follows

SQL

Select count(*) from (
select Table1.ID,Table1.RollNo
from 
Table1 inner join Table2 on Table1.RollNo = Table2.RollNo and Table1.ID = Table2.ID
where Table1.Subject='Maths' and Table2.Category='Complusary'
union
select Table1.ID,Table1.RollNo
from
Table1 inner join Table2 on Table1.RollNo = Table2.RollNo and Table1.ID = Table2.ID
where Table1.Subject='Maths' and Table2.Category='Elective') as test

Regards
Sebastian

how to find count over rows selected by union

3 solutions

Solution 1

Solution 2

Solution 3

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