Question

我有2张桌子
第一个名字是（employee）有3列（emp_id，first_name，last_name）
第二个表的名称是（works_with），也有3列（emp_id，client_id，total_sales）
在（works_with）表中，相同的emp_id可以与不同的client_id相关联

我需要从（work_with）表中提取（雇员）表的（first_name）和（last_name）表格以及它们的（total_sales）超过30000

我用这段代码给了我（emp_id）*，其（total_sales）超过30000

SELECT SUM(works_with.total_sales), works_with.emp_id
FROM works_with
WHERE works_with.emp_id IN (SELECT works_with.emp_id
                            FROM works_with 
                            WHERE works_with.total_sales > 30000) 
GROUP BY works_with.emp_id;

然后我用这段代码给我（emp_id）*的（first_name）和（last_name）*

SELECT employee.first_name, employee.last_name
FROM employee
WHERE employee.emp_id IN (SELECT works_with.emp_id
                          FROM works_with
                          WHERE works_with.total_sales > 30000);

是否有一种方法可以加入这两个代码，或者以其他任何方式获得我想要的结果

谢谢

Answer 1

您只是在寻找JOIN吗？

SELECT e.first_name, e.last_name, SUM(ww.total_sales)
FROM works_with ww JOIN
     employee e
     ON ew.emp_id = ww.emp_id
WHERE ww.emp_id IN (SELECT ww2.emp_id
                    FROM works_with  ww2
                    WHERE ww.total_sales > 30000
                   ) 
GROUP BY e.emp_id, e.first_name, e.last_name;

不需要子查询。它正在实现此逻辑：

SELECT e.first_name, e.last_name, SUM(ww.total_sales)
FROM works_with ww JOIN
     employee e
     ON ew.emp_id = ww.emp_id
GROUP BY e.emp_id, e.first_name, e.last_name
HAVING MAX(ww.total_sales) > 30000;

但是，我怀疑您想要

SELECT e.first_name, e.last_name, SUM(ww.total_sales)
FROM works_with ww JOIN
     employee e
     ON ew.emp_id = ww.emp_id
GROUP BY e.emp_id, e.first_name, e.last_name
HAVING SUM(ww.total_sales) > 30000;

Answer 2

Contributing here since I noticed an error in the other answer. See here for how different types of JOINs work: (Link).

SELECT 
    Employee.First_Name, 
    Employee.Last_Name, 
    SUM(WW.Total_Sales)
FROM 
    Works_With AS WW
        INNER JOIN Employee AS Employee
            ON Employee.EMP_ID = WW.EMP_ID
GROUP BY 
    Employee.EMP_ID, 
    Employee.First_Name, 
    Employee.Last_Name
HAVING 
    SUM(WW.Total_Sales) > 30000;

如何加入两个sql子查询

2 个答案: