Question

我有一个包含以下架构的表

<Icon name="trash" className="trash-icon" onClick={() =>
  console.log(this.props.movies[i].id),
  this.props.onMovieClick(this.props.movies[i].id)
}/>

我想做点什么

id data rank usage 1 hi 19 H 2 he 14 M 3 me 9 L 4 ke 23 H 5 jo 11 M 6 km 2 L 7 lo 4 L 8 no 12 M 9 my 20 H

SQL不支持如下语句：

If max(rank) where usage='L'>=25 Then Select all records where usage='H' Else If max(rank) where usage='M'>=25 Select all records where usage='L' and records where usage='M' ELSE Select all records

那么，我应该怎么写这个查询呢？

Answer 1

select  id,data,rank,usage

from   (select  *
               ,max(case usage when 'L' then rank end) over () max_rank_L   
               ,max(case usage when 'M' then rank end) over () max_rank_M

        from    mytable 
        ) t

where   usage rlike case
                        when max_rank_L >= 25 then '^(H)$'
                        when max_rank_M >= 25 then '^(L|M)$'
                        else                       '()'
                    end

Answer 2

您可以在过滤器中应用逻辑。此查询应该为您提供所需内容：

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具有复杂case-when语句的SQL查询

2 个答案: