力扣sql简单篇练习(三十一)

力扣sql简单篇练习(三十一)

1 整理奥运表

1.1 题目内容

1.1.1 基本题目信息

1.1.2 示例输入输出

1.2 示例sql语句

# Write your MySQL query statement below
SELECT country,gold_medals,silver_medals,bronze_medals
FROM Olympic
ORDER BY gold_medals desc,silver_medals desc,bronze_medals desc,country asc

1.3 运行截图

2 形成化学键

2.1 基本题目内容

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

# Write your MySQL query statement below
SELECT e1.symbol metal,e2.symbol nonmetal
FROM
(
    SELECT symbol
    FROM Elements
    WHERE type='Metal'
)e1
CROSS JOIN 
(
    SELECT symbol
    FROM Elements
    WHERE type='nonmetal'
)e2

2.3 运行截图

3 把名字和职业联系起来

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

# Write your MySQL query statement below
SELECT person_id,concat_ws('',name,'(',LEFT(profession,1),')') name
FROM Person
ORDER BY person_id desc

3.3 运行截图