Employee Bonus --leetcode

leetCode sql沒幾道題 就開始 收費模式了

Select all employee's name and bonus whose bonus is < 1000.

Table:Employee

+-------+--------+-----------+--------+
| empId |  name  | supervisor| salary |
+-------+--------+-----------+--------+
|   1   | John   |  3        | 1000   |
|   2   | Dan    |  3        | 2000   |
|   3   | Brad   |  null     | 4000   |
|   4   | Thomas |  3        | 4000   |
+-------+--------+-----------+--------+
empId is the primary key column for this table.
Table: Bonus

+-------+-------+
| empId | bonus |
+-------+-------+
| 2     | 500   |
| 4     | 2000  |
+-------+-------+
empId is the primary key column for this table.
Example ouput:

+-------+-------+
| name  | bonus |
+-------+-------+
| John  | null  |
| Dan   | 500   |
| Brad  | null  |
+-------+-------+

這些被鎖的題目  不能在線驗證了

solution：

SELECT
    Employee.name, Bonus.bonus
FROM
    Employee
        LEFT JOIN
    Bonus ON Employee.empid = Bonus.empid
WHERE
    bonus < 1000 OR bonus IS NULL
;

Note: "LEFT OUTER JOIN" could be written as "LEFT JOIN".