sql - 当表具有来自 2 个不同表的 2 个外键时的删除操作

Question

假设我有一个表table3，它包含两个外键，每个外键引用一个不同的表。我想知道，我可以ON DELETE为他们定义两个不同的动作。

让我通过一个例子来解释它。

create table table3 (
    ID varchar(255),
    Name varchar(255),
    primary key(ID,Name),
    foreign key(ID) References user(id),
    foreign key(Name) References shops(StoreName)
       on update cascade
       on delete cascade // I want to cascade table if id is deleted
       on delete no actions); // and do not allowed  if StoreName is deleted.

有没有人可以帮助我？提前致谢。

Answer 1

不确定我是否完全理解您要执行的操作 - 但如果您希望对ON DELETE CASCADE表User的ON DELETE NO ACTIONSfk 引用和对表的 fk 引用有，则Shops需要使用此 T-SQL：

create table table3 (
    ID varchar(255),
    Name varchar(255),
    primary key(ID,Name),

    foreign key(ID) References user(id)
       on delete cascade,    // I want to cascade table if id is deleted        

    foreign key(Name) References shops(StoreName)
       on update cascade
       on delete no actions); // and do not allowed  if StoreName is deleted.

您需要使用定义指定ON DELETE ....操作权限foreign key