在 MySQL 中删除主键

Remove Primary Key in MySQL

mysql sql database-design primary-key mysql-error-1075
提问时间: 2010-01-21 17:20:38

更改表以添加复合主键

ALTER TABLE to add a composite primary key

mysql sql primary-key alter-table composite-primary-key
提问时间: 2012-01-14 01:20:26

是否有真正的性能差异 INT 和 VARCHAR 主键?

Is there a REAL performance difference between INT and VARCHAR primary keys?

mysql performance primary-key innodb myisam
提问时间: 2008-12-01 21:26:49

无法更新 EntitySet-因为它有 DefiningQuery 和 < UpdateFunction > 元素不存在

Unable to update the EntitySet - because it has a DefiningQuery and no <UpdateFunction> element exist

c# asp.net .net entity-framework primary-key
提问时间: 2011-09-28 13:09:36

插入如果不存在' 如何在 MySQL 中?

How to 'insert if not exists' in MySQL?

php sql mysql performance primary-key
提问时间: 2009-09-01 08:56:41

MySQL 中存在键、 主键、 唯一键和索引之间的区别

Difference between Key, Primary Key, Unique Key and Index in MySQL

mysql indexing primary-key unique-key sqlperformance
提问时间: 2010-10-02 08:05:07

可以在单个表中有多个主键?

Can I have multiple primary keys in a single table?

database database-design primary-key
提问时间: 2008-10-20 09:56:23

如何重置 postgres 的主键序列,它降不同步?

How to reset postgres' primary key sequence when it falls out of sync?

database postgresql primary-key
提问时间: 2008-10-28 18:08:21