mysql - 带限制条件的sql语句groupby

Question

我想做的是返回卡车车主总数超过指定限制的所有记录 在下面的情况下，假设总限制为 3，我想获取所有注册了 3 辆或更多卡车的车主

所以查询如果限制是 3 应该只返回 metro trans 因为他们有 3 辆或更多卡车

这是我的数据库结构

tbl_trucks
id   owner_id  .....
1    12
2    12
3    13
4    12

tbl_truck_owners
id   owner
12   metro trans
13   mush elec

如何将限制添加到我的sql语句中

这是我试过的

SELECT 
     COUNT(tbl_trucks.owner_id), tbl_truck_owners.owner
      FROM tbl_trucks
        LEFT JOIN tbl_truck_owners ON tbl_trucks.owner_id = tbl_truck_owners.id

        WHERE              //stuck at adding the limit

        GROUP BY owner_id"

如何添加限制

Answer 1

使用 HAVING 语句:

SELECT COUNT(tbl_trucks.owner_id), tbl_truck_owners.owner
FROM tbl_trucks
LEFT JOIN tbl_truck_owners ON tbl_trucks.owner_id = tbl_truck_owners.id
GROUP BY owner_id
HAVING COUNT(tbl_trucks.owner_id) >= 3