Question

gradeid | startrange | endrange
----------------------
A    | 50000  | 1000000
B    | 25000  | 49999
C    | 10000  | 24999

Employee 
id | salary
-----------
1  | 23000
2  | 20000
3  | 100000

我想让所有员工在单一查询中获得成绩。由于没有公共字段，我可以使用两个子查询来完成此操作。

 select id from employee where salary 
    between (select startrange from grade where gradeid='A')
 and (select endrange from grade where gradeid='A')

还有其他更好的SQL查询吗？

Answer 1

您可以使用JOIN：

CREATE TABLE #grades(gradeid VARCHAR(100), startrange INT, endrange INT);

INSERT INTO #grades 
VALUES ('A', 50000, 1000000),('B', 25000, 49999),('C', 10000, 24999);

CREATE TABLE #Employee(id  INT, salary INT);

INSERT INTO #Employee VALUES(1, 23000),(2, 20000),(3, 100000);

SELECT e.*
FROM #Employee e
JOIN #grades g
  ON e.salary BETWEEN startrange AND endrange
WHERE g.gradeid = 'A';

的 LiveDemo

在单个查询之间和加入

1 个答案: