leetcode 627. Swap Salary 数据库带判断的更新操作

https://leetcode.com/problems/swap-salary/description/

用  set keyWord = Case depentedWord

when haha then baba

else lala

end

最后需要end

# Write your MySQL query statement below
update salary 
set sex = case sex 
when 'm' then 'f' 
else 'm'
end;