577. 員工獎金（SQL）
阿新 • • 發佈：2021-01-29
技術標籤：databaseleetcode easyleetcode
題目：https://leetcode-cn.com/problems/employee-bonus/
選出所有 bonus < 1000 的員工的 name 及其 bonus。
Employee 表單
+-------+--------+-----------+--------+
| empId | name | supervisor| salary |
+-------+--------+-----------+--------+
| 1 | John | 3 | 1000 |
| 2 | Dan | 3 | 2000 |
| 4 | Thomas | 3 | 4000 |
+-------+--------+-----------+--------+
empId 是這張表單的主關鍵字
Bonus 表單
+-------+-------+
| empId | bonus |
+-------+-------+
| 2 | 500 |
| 4 | 2000 |
+-------+-------+
empId 是這張表單的主關鍵字
輸出示例：
+-------+-------+
| name | bonus |
+-------+-------+
| John | null |
| Brad | null |
+-------+-------+
程式碼：
SELECT E.name, B.bonus FROM Employee E LEFT JOIN Bonus B ON E.empId = B.empId WHERE B.bonus < 1000 or B.bonus IS NULL