在 SQL 中使用别名计算新字段

问题描述

您好，我正在处理一些体育博彩数据并尝试划分列以尝试计算平均值和其他统计数据，基本上我想创建一个新列来计算以下内容 --> Covered/(Covered+Loss+推）作为 Covered_Average。我觉得在 excel 中执行此操作要容易得多，但想知道在 SQL 中是否有效。

select g1.team_id,t.abbreviation,count(case when cast(g2.pts as float)-cast(g1.pts as float) < cast(spread2 as float) then 'Covered' end) as Covered,count(case when cast(g2.pts as float)-cast(g1.pts as float) > cast(spread2 as float) then 'Loss' end) as Loss,count(case when cast(g2.pts as float)-cast(g1.pts as float) = cast(spread2 as float) then 'Push' end) as Push 
     from nba_games_all g1
     left outer join nba_games_all g2 on g1.game_id = g2.game_id
     and g1.team_id =g2.a_team_id
     left join nba_teams_all t on t.team_id=g1.team_id
     left join nba_betting_spread bs on g1.game_id = bs.game_id
     and book_name = 'Bovada'
     left join nba_betting_money_line ml on g1.game_id = ml.game_id
     and ml.book_name = 'Bovada'
     where g1.season_year = '2017' 
     and g1.season_type = 'Regular Season'
     and g1.fg_pct >= '0.5'
     and g1.game_date >= Convert(datetime,'2017-11-02')
     group by g1.team_id,t.abbreviation
     order by Covered desc

解决方法

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