MS访问SQL：更换一个字段的字符串+

Question

我试图更新MS Access数据库中的表，它包含了一些电影资料其他行值

 

    [Table:Movies] 
    MovieName CrewId CrewMember 
    The Big Lebowski  1  Joel Coen 
    The Big Lebowski  2  Ethel Coen 
    The Big Lebowski  3  Carter Burwell 
    The Big Lebowski  4  Roger Deakins 
    The Matrix    1  Andy Wachowski 
    The Matrix    2  Lana Wachowski 
    The Matrix    3  Don Davis 
    The Matrix    4  Bill Pope 

CrewId 1是导演和2是CO /助理导演等等。

什么，我试图做的是与“导演姓名的助手”“船员”替换列联合导演的名字，像下面

 

    [Table:Movies] 

    MovieName CrewId CrewMember 
    The Big Lebowski  1  Joel Coen 
    The Big Lebowski  2  Assistant of Joel Coen 
    The Big Lebowski  3  Carter Burwell 
    The Big Lebowski  4  Roger Deakins 
    The Matrix    1  Andy Wachowski 
    The Matrix    2  Assistant of Andy Wachowski 
    The Matrix    3  Don Davis 
    The Matrix    4  Bill Pope 

我使用下面的查询这是给语法错误（缺少操作员）。

 

    UPDATE t1 
    SET t1.CrewMember = 'Assistant of '+ t2.CrewMember 
    FROM Movies t1, Movies t2 
    WHERE t1.MovieName = t2.MovieName 
    AND t1.CrewId = 2 
    AND t2.CrewId = 1; 

请帮我这个查询使用

Answer 1

试试这个：

UPDATE Movies as t1, Movies as t2 
SET t1.CrewMember = 
'Assistant of ' + t2.CrewMember 
WHERE t1.MovieName=t2.MovieName AND t1.CrewId=2 AND t2.CrewId=1 

Answer 2

在Access中，字符串concatonation完成 “&”

所以它应该是：

UPDATE t1 
    SET t1.CrewMember = 'Assistant of '& t2.CrewMember 
    FROM Movies t1, Movies t2 
    WHERE t1.MovieName = t2.MovieName 
    AND t1.CrewId = 2 
    AND t2.CrewId = 1; 

Answer 3

我猜测的原因是因为Access中的字符串连接运算符是&而不是+。另外，我觉得接入需要as对表的别名，你可以使用一个join的条件：

UPDATE t1 
    SET t1.CrewMember = 'Assistant of '+ t2.CrewMember 
    FROM Movies as t1 join 
     Movies as t2 
     on t1.MovieName = t2.MovieName 
    where t1.CrewId = 2 AND t2.CrewId = 1;