Question

Conceptually, I have a table with a list of fruit items. I want, in a single query, to see counts of how many apples, oranges, ‘apples or oranges’, and ‘other fruit’ there are.

How can I achieve this in T-SQL?

Answer 1

SELECT
   COUNT(*) AS Allfruits,
   COUNT(CASE WHEN fruit = 'Apple' THEN 1 END) AS AppleCount,
   COUNT(CASE WHEN fruit = 'Orange' THEN 1 END) AS OrangeCount,
   COUNT(CASE WHEN fruit IN ('Apple','Orange') THEN 1 END) AS AppleOrOrangeCount,
   COUNT(*) - COUNT(CASE WHEN fruit IN ('Apple','Orange') THEN 1 END) AS OtherFruitCount
FROM
   MyTable

Note: CASE gives NULL without an ELSE clause or some explicit condition. COUNT ignores NULL.