在mysql中分两次查询

Question

我写了以下查询

 SELECT Registration.FName,RequestPooja.RitualId AS RitualId FROM RequestPooja INNER JOIN Registration
 ON RequestPooja.UserId = Registration.Id   WHERE Registration.Id=2
 UNION ALL
 SELECT Registration.FName,AaparaKarma.RitualId AS RitualId  FROM AaparaKarma INNER JOIN Registration
 ON AaparaKarma.UserId = Registration.Id  
 WHERE Registration.Id=2

产生结果

FName   RitualId
Shreyas 24
Shreyas 37
Shreyas 37
Shreyas 37

现在我有一个Rituals表

SELECT Rituals.Id,Rituals.Name FROM Rituals

将输出

 Id    Name
 24    ABC
 37    xyz

现在我想对这两个问题进行分析，我希望得到所需的结果

 FName  RitualId    Name
 Shreyas    24     ABC
 Shreyas    37     xyz
 Shreyas    37     xyz  
 Shreyas    37     xyz

我应该使用连接还是内部查询来获得所需的结果。任何帮助表示感谢。

Answer 1

检查这个。 使用Join可以提高性能。

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