Why do I need to use foreign key if I can use WHERE?(如果可以使用 WHERE，为什么还需要使用外键?)

MySQL with Soft-Deletion, Unique Key and Foreign Key Constraints(具有软删除、唯一键和外键约束的 MySQL)

Exact Meaning of MySQL#39;s Foreign Key #39;on delete restrict#39; Clause(MySQL的外键on delete restrict子句的确切含义)

SQL Server 2008: The columns in table do not match an existing primary key or unique constraint(SQL Server 2008:表中的列与现有的主键或唯一约束不匹配)

Is string or int preferred for foreign keys?(外键首选字符串还是整数?)

Use of non-clustered index on guid type column in SQL Server(在 SQL Server 中的 guid 类型列上使用非聚集索引)

Is it possible to drop all foreign key constraints on a table at once in mySQL 5?(是否可以在 mySQL 5 中一次删除表上的所有外键约束?)

unable to drop the foreign key(无法删除外键)

SQL design around lack of cross-database foreign key references(围绕缺乏跨数据库外键引用的 SQL 设计)

Deleting a row with a self-referencing foreign key(删除具有自引用外键的行)

Enforce a foreign-key constraint to columns of same table(对同一表的列实施外键约束)

Can you have a Foreign Key onto a View of a Linked Server table in SQLServer 2k5?(您可以在 SQLServer 2k5 中的链接服务器表的视图上使用外键吗?)

Foreign key to composite key(外键到复合键)

Foreign Keys - What do they do for me?(外键——它们对我有什么作用?)

MySQL table with a varchar column as foreign key(以 varchar 列作为外键的 MySQL 表)

Mysql: adding foreign key does not give warning/error on MyISAM tables(Mysql:添加外键不会在 MyISAM 表上给出警告/错误)

Changing MySQL primary key when foreign key contraints exist(存在外键约束时更改 MySQL 主键)

Identifying Sybase tables, fields, keys, constraints(识别 Sybase 表、字段、键、约束)

For a composite foreign key, is a/why is a composite UNIQUE constraint in the referenced table required for a column combination with a primary key?(对于复合外键，与主键的列组合是否需要/为什么引用表中的复合 UNIQUE 约束?)

Mysql query to dynamically convert rows to columns on the basis of two columns(Mysql查询根据两列动态将行转换为列)