MySQL - 使用條件與計數？

Question

我有以下SQL語句：

select val, count(*) as tally from sometable group by val order by tally desc 

將會產生以下的（例子）表：

val | tally 
----+------- 
4 | 20 
5 | 10 
6 | 5 
7 | 3 
8 | 2 

現在，我想只顯示行，其中tally > 5，這樣的結果將是：

val | tally 
----+------- 
4 | 20 
5 | 10 

我想這個說法，但它不工作（它說：「理貨」未知）：

select val, count(*) as tally from sometable where tally > 5 group by val order by tally desc 

Answer 1

嘗試有（more information）：

select val, count(*) as tally from sometable group by val having tally > 5 order by tally desc 

Answer 2

，有兩種方式可以採取：

1：使用HAVING。這意味着，查詢結果將被過濾爲每HAVING條款，只有一些原始的結果行會退還給你：

SELECT val, COUNT(*) AS tally 
FROM sometable 
GROUP BY val 
ORDER BY tally DESC 
HAVING tally > 5 

2：使用子選擇。這可能會給你更好的表現（我沒有sql guru，所以我不能自信地說）：

SELECT val, tally 
FROM (SELECT val, COUNT(*) AS tally 
     FROM sometable 
     GROUP BY val 
     ORDER BY tally DESC) 
     temp 
WHERE tally >1