MySQL case when 用法

MySQL case when 用法

eg:

SELECT type,
    CASE
        WHEN `type` = 1 THEN
            '熱門優惠'
        WHEN `type` = 2 THEN
            '新優惠'
        WHEN `type` = 3 THEN
            '現金券'
        WHEN `type` = 4 THEN
            '1蚊福利'
        WHEN `type` = 5 THEN
            '積分換領'
        WHEN `type` = 6 THEN
            'mCoin現金券'
        ELSE
            'mCoin現金券'
    END as type
FROM fook_business_product