Question

我遇到了这个SQL语句的问题。我试图通过ID＆＃39; 25＆＃39;将结果限制在玩家身上。和＆＃39; 87＆＃39;查询没有错误（我通过此查询得到每个PID）这是语句。

SELECT Rosters.PID, SUM( Rosters.Goals ) Goals, SUM( Rosters.Assists ) Assists, SUM( Rosters.PIM ) PIM, Rosters.TID, Players.pid, Players.firstname, Players.lastname, 
       SUM((Rosters.Goals + Rosters.Assists)) AS Points, Teams.tid, Teams.teamname
       FROM Rosters
       INNER JOIN Players
       ON Rosters.PID = Players.pid
       INNER JOIN Teams 
       ON Rosters.TID = Teams.tid
       WHERE ((Rosters.TID BETWEEN 9 AND 16) AND (Players.pid = 25 OR 87))
       GROUP BY 
       Players.pid
       ORDER BY Points DESC

我几乎可以肯定这是我缺乏SQL理解的原因，但是W3C学校并没有提供更复杂的解决方案，而且我查找的Stack线程已经非常本地化了。

Here is the current output. It should just be the players with Id's 25 and 87

Answer 1

Players.pid附近的条件有误。

应该是

(Players.pid = 25 OR Players.pid = 87)

逻辑OR运算符组合了两个逻辑条件。 Players.pid = 25是有效条件，它评估为布尔true或false。但是87肯定不会计算为布尔值。

Answer 2

只需将代码的一部分从Players.pid = 25 OR 87更改为Players.pid = 25 OR Players.pid = 87

Answer 3

或者您可以使用IN构造将Players.pid与可能值列表进行匹配（请注意，不再需要外括号）：

QXmlStreamReader

Answer 4

另外如果您认为Players.pid会增加以检查条件，您可以使用IN操作并像这样使用

AND Players.pid IN (25,87) // You can add here more id to check

代替您的代码

AND (Players.pid = 25 OR 87)

SQL加入＆＃34; AND＆＃34; +＆＃34;或＆＃34;声明

4 个答案: