Subtraction between two sql queries

Question

I have 2 queries in MS SQL that return a number of results using the COUNT function.

I can run the the first query and get the first result and then run the other on

Answer 1

You should be able to use subqueries for that:

SELECT
    (SELECT COUNT(*) FROM ... WHERE ...)
  - (SELECT COUNT(*) FROM ... WHERE ...) AS Difference

Just tested it:

Difference
-----------
45

(1 row(s) affected)

Answer 2

select @result = (select count(0) from table1) - (select count(0) from table2)

Answer 3

The query is like below :

((SELECT SUBSTRING_INDEX(SUBSTRING_INDEX(m,'/',2),'/',-1) 
FROM ms WHERE ms.id=t.m_id)-(SELECT COUNT(id) FROM t AS tr WHERE tr.m_id=t.m_id)) AS remaining

Answer 4

This will return the difference

SELECT COUNT(Attribute) - COUNT(DISTINCT Attribute) FROM table_name;

Answer 5

The query is like below :

SELECT (select COUNT(FIRSTNAME) FROM TRMDW.EMPLOYEE1) - (SELECT COUNT(DISTINCT FIRSTNAME) FROM TRMDW.EMPLOYEE1) as difference from dual;