1. 题目

编写一个 SQL 语句，获取球员 (players) 表中第二高的身高 (height)

表定义: players (球员表)

https://www.lintcode.com/problem/1918

2. 解题

• if(a,b,c), a true，执行 b， 否则 c

-- Write your SQL Query here --
-- example: SELECT * FROM XX_TABLE WHERE XXX --
select
(if((select count(*) from (select distinct height from players) p) >= 2,(select distinct height from players order by height desc limit 1 offset 1),NULL)
) second_height

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