Question

IMDB database Image to database structure FletNix

INSERT INTO FletNix_2.dbo.Movie_Cast
    SELECT cast(Pid AS int) AS person_id,
    cast(Mid AS int) AS movie_id,
    LEFT(Role, 255) AS role
    FROM MYIMDB.dbo.Imported_Cast

INSERT INTO FletNix_2.dbo.Movie_Directors
    SELECT cast(Did AS int) AS person_id,
    cast(Mid AS int) AS movie_id
    FROM MYIMDB.dbo.Imported_Movie_Directors

错误信息：

消息2627，级别14，状态1，第71行违反主键   约束“ pk_moviecast”。无法在对象中插入重复键   'dbo.Movie_Cast'。重复的键值为（（未知））。

消息547，级别16，状态0，第77行INSERT语句冲突   具有FOREIGN KEY约束“ fk_directors_Person”。冲突   发生在数据库“ FletNix_2”的表“ dbo.Person”的列中   “ person_id”。

我知道我需要使用distinct，但是当我这样做时

INSERT INTO FletNix_2.dbo.Movie_Cast
    SELECT cast(Pid AS int) AS person_id,
    cast(Mid AS int) AS movie_id,
    distinct LEFT(Role, 255) AS role
    FROM MYIMDB.dbo.Imported_Cast

它给出一个错误：语法不正确

当我在SELECT之后放不同时，我仍然收到错误：

违反主键约束“ pk_moviecast”。无法插入对象“ dbo.Movie_Cast”中的重复键。重复的键值为（（未知））

AND

INSERT语句与FOREIGN KEY约束冲突 “ fk_directors_Person”。数据库“ FletNix_2”中发生了冲突，表“ dbo.Person”的“ person_id”列。

Answer 1

区别应该在select

之后

    INSERT INTO FletNix_2.dbo.Movie_Cast
    SELECT distinct cast(Pid AS int) AS person_id,
    cast(Mid AS int) AS movie_id,
    LEFT(Role, 255) AS role
    FROM MYIMDB.dbo.Imported_Cast

由于您的角色列是主要角色，因此不必重复，因此我使用row_number（）生成唯一编号

     select 
    cast(Pid AS int) AS person_id,
    cast(Mid AS int) AS movie_id,        
    row_number()over( order by (select null)) as role
    FROM MYIMDB.dbo.Imported_Cast

我无法插入sql

1 个答案: