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LeetCode(数据库)- 丢失信息的雇员


题目链接:​​点击打开链接​​

题目大意:略。

解题思路:略。

AC 代码

-- 解决方案(1)
with t as (
select employee_id from Employees
union all
select employee_id from Salaries)

select employee_id from t
group by employee_id
having count(employee_id)=1
order by employee_id

-- 解决方案(2)
WITH t AS (SELECT employee_id FROM Employees
UNION
SELECT employee_id FROM Salaries)

SELECT *
FROM t
WHERE employee_id NOT IN (SELECT e.employee_id FROM Employees e JOIN Salaries s USING(employee_id))
ORDER BY employee_id


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