分组依据和限制mySql中的输出

Question

我在语法上遇到了困难。我知道错误在哪里，但不能正确的行。

让我们说尝试计算食物组，我想看看食物组的详细数量。

这很有效：

SELECT FoodGroup, Count(*) as mycount
FROM Food
Group By FoodGroup

我得到了一个不错的输出

Vegies 190
Spices  64
breads  16

但我希望将输出限制为包含50个或更多项目的输出

SELECT FoodGroup, Count(*) as mycount
FROM Food
Where mycount > 49   <--this line in the issue
Group By FoodGroup

WHERE子句应该看起来像什么？

Answer 1

请试试这个：

SELECT FoodGroup, Count(*) as mycount
FROM Food
Group By FoodGroup
Having mycount > 49

Answer 2

您可以使用HAVING子句代替WHERE来实现此目的，如下所示

SELECT FoodGroup, Count(*) as my_count
FROM Food  
GROUP BY FoodGroup
HAVING my_count > 49