mysql - 在mysql中俱乐部两个查询

Question

我编写了以下查询

 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

其产生的结果为

FName   RitualId
Shreyas 24
Shreyas 37
Shreyas 37
Shreyas 37

现在我有一个仪式表

SELECT Rituals.Id,Rituals.Name FROM Rituals

输出为

 Id    Name
 24    ABC
 37    xyz

现在我想将这两个查询合并在一起，并且希望得到所需的结果

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

我应该使用联接还是内部查询来获得所需的结果？任何帮助表示赞赏。

Answer 1

检查这个。 使用 Join 因为它可以提供更快的性能。

SELECT Registration.FName,RequestPooja.RitualId AS RitualId ,Rituals.Name 
FROM RequestPooja 
INNER JOIN Registration  ON RequestPooja.UserId = Registration.Id   
INNER JOIN Rituals ON  Rituals.Id=RequestPooja.RitualId
WHERE Registration.Id=2

UNION ALL

 SELECT Registration.FName,AaparaKarma.RitualId AS RitualId  ,Rituals.Name 
 FROM AaparaKarma 
 INNER JOIN Registration  ON AaparaKarma.UserId = Registration.Id  
 INNER JOIN Rituals ON  Rituals.Id=AaparaKarma.RitualId
 WHERE Registration.Id=2