How do I create a SQL query that groups in certain percent range

Question

I would like to create a SQL query that groups the increase price of items in certain percentage range. For example

2 items increased between 0 to 10 %

4 items i

Answer 1

SELECT SUM(CASE WHEN PercentChange >= 0 AND PercentChange <= 10 THEN 1 ELSE 0) END AS ZeroTen,
       SUM(CASE WHEN PercentChange > 10 AND PercentChange <= 20 THEN 1 ELSE 0) END AS TenTwenty,
       SUM(CASE WHEN PercentChange > 20 AND PercentChange <= 30 THEN 1 ELSE 0) END AS TwentyThirty
    FROM MagicChangeTable

Note: MagicChangeTable may in fact be a subquery to calculate the percent change.