复杂 sql 查询多对多

Question

我的数据库是这样创建的：

我想 select 同一个人的人名和电影名充当 "Oyuncu" 和 "Senarist"

请帮帮我。我写了一个这样的查询；

select 
    MovieName,PersonName,RoleName 
from 
    Movies,
    MoviesPersonRole,
    PersonRole,
    Person,
    Role
where 
    Movies.Id = MoviesPersonRole.MovieId 
    and 
    PersonRole.Id = MoviesPersonRole.PersonRoleId 
    and 
    PersonRole.RoleId = Role.Id 
    and 
    PersonRole.PersonId = Person.Id

结果是

MovieName         PersonName    RoleName
Pulp Fiction       Mehmet        Oyuncu
Pulp Fiction       Mehmet        Senarist
Matrix             Aylin         Oyuncu
LOTR               Gökberk       Oyuncu
LOTR               Gökberk       Senarist
Pulp Fiction       Aylin         Oyuncu

Answer 1

将此行添加到您的查询中

and Role.RoleName in('Oyuncu' ,'Senarist')

Answer 2

第二个 Join on Role 应该可以做到：

SELECT  MovieName ,
        PersonName ,
        RoleName
FROM    Movies
        JOIN MoviesPersonRole ON Movies.Id = MoviesPersonRole.MovieId
        JOIN PersonRole ON PersonRole.Id = MoviesPersonRole.PersonRoleId
        JOIN Person ON PersonRole.PersonId = Person.Id
        JOIN Role Role1 ON PersonRole.RoleId = Role1.Id
        JOIN Role Role2 ON PersonRole.RoleId = Role2.Id
WHERE   Role1.RoleName = 'Oyuncu'
        AND Role2.RoleName = 'Senarist'

Answer 3

尝试以下查询：

SELECT  MovieName ,
        PersonName ,
        RoleName
FROM    Movies,
        MoviesPersonRole,
        PersonRole,
        Person,
        Role
WHERE   Role1.RoleName = 'Oyuncu'
        AND Role2.RoleName = 'Senarist'
        AND Movies.Id = MoviesPersonRole.MovieId 
        AND PersonRole.Id = MoviesPersonRole.PersonRoleId 
        AND PersonRole.RoleId = Role.Id 
        AND PersonRole.PersonId = Person.Id

Answer 4

您可以尝试这样的操作：

SELECT X.MovieName, X.PersonName FROM (
  SELECT M.MovieName, PE.PersonName, COUNT(*) AS RoleCount
    FROM Movies M
    INNER JOIN MoviesPersonRole MPR ON (MPR.MovieId=M.Id)
    INNER JOIN PersonRole PR ON (PR.Id = MPR.PersonRoleId)
    INNER JOIN Person PE ON (PE.Id = PR.PersonId)
    INNER JOIN Role R ON (R.Id = PR.RoleId)
    WHERE R.RoleName='Oyuncu' OR R.RoleName='Senarist' 
    GROUP BY M.MovieName, PE.PersonName
  ) X WHERE X.RoleCount>1

复杂 sql 查询多对多

complex sql query many to many

sql

sql-server

tsql

many-to-many