MySQL查詢找到最流行的入門

Question

我的表如下所示：

hook_bait | brand | flavour 
---------------------------------- 
corn  |   | 
bread  |   | 
boily  | variable | variable 

我需要運行一個MySQL查詢，這將使我最流行的hook_bait的名稱，如果一個boily - 什麼牌子和口味最流行的boily是。

我不知道從哪裏開始

Answer 1

您可以通過查詢得到最流行的hook_bait這樣的：

SELECT 
    hook_bait, 
    COUNT(hook_bait) AS popularity 
FROM sample_table 
GROUP BY hook_bait 
ORDER BY popularity DESC 
LIMIT 0, 1 

完整的示例查詢：

SELECT 
    hook_bait, 
    IF(hook_bait = 'boily', (SELECT brand FROM sample_table t2 WHERE t2.hook_bait = t1.hook_bait GROUP BY brand ORDER BY COUNT(brand) DESC LIMIT 1), '-') AS brand, 
    IF(hook_bait = 'boily', (SELECT flavour FROM sample_table t2 WHERE t2.hook_bait = t1.hook_bait GROUP BY flavour ORDER BY COUNT(flavour) DESC LIMIT 1), '-') AS flavour 
FROM sample_table t1 
GROUP BY hook_bait 
ORDER BY COUNT(hook_bait) DESC 
LIMIT 0, 1