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

SELECT (count(*) from t1) - (count(*) from t2);

this worked for me.

Also if there is only one table you can also do:

SELECT (count(column1)) - count(column2)) from table;