力扣sql基础篇(五)

力扣sql基础篇(五)

1 页面推荐

1.1 题目内容

1.1.1 基本题目信息

1.1.2 示例输入输出

a 输入示例

b 输出示例

1.2 示例sql语句

# Write your MySQL query statement below
SELECT distinct page_id recommended_page 
FROM Likes
WHERE (user_id in
(
    SELECT user2_id
    FROM Friendship
    WHERE user1_id=1
)
OR
user_id in
(
    SELECT user1_id
    FROM Friendship
    WHERE user2_id=1
)
)
AND page_id NOT in
(
    SELECT page_id
    FROM Likes
    WHERE user_id=1
)

1.3 运行截图

2 至少有五名直接下属的经理

2.1 题目内容

2.1.1 基本题目信息

2.1.2 示例输入输出

2.2 示例sql语句

SELECT name
FROM Employee
WHERE id in
(
    SELECT managerId
    FROM Employee
    GROUP BY managerId
    HAVING count(*)>=5
)

2.3 运行截图

3 求团队人数

3.1 题目内容

3.1.1 基本题目信息

3.1.2 示例输入输出

3.2 示例sql语句

SELECT e.employee_id,t.team_size
FROM Employee e
INNER JOIN
(
SELECT team_id,count(team_id) team_size
FROM Employee
GROUP BY team_id
)t
ON e.team_id=t.team_id

3.3 运行截图