SQL has become the standard language for interacting with relational databases. An SQL database uses tables to store and manage structured data with a focus on data integrity and relationships. MySQL, ...

既然 sql_require_primary_key 参数控制了强制检验主键，而且又是可动态修改的，临时关闭，再打开即可。 MySQL 支持多个语句一次 ...

enable-foreign-keys.mysql.sql File metadata and controls Code Blame 14 lines (13 loc) · 1.08 KB Raw ...

The similar syntax is used in MariaDB: drop foreign key if exists fk_symbol but the original MySQL doesn't supports if exists statement yet. The H2 with enabled MODE=MySQL is also ignores if exists so ...

MySQL报错cannot add foreign key constr 2018-10-09 13:36 这种报错是提示无法正确的插入外键约束，那我分析一下，设置外键有以下几个条件： 1、要设置外键的字段不能为主键 2、改建所参考的字段必须为主键 3、两个字段必须具有相同的数据类型和约束 ...

Indexes in MySQL are used to speed up access in the database and help enforce database constraints (such as UNIQUE and FOREIGN KEY). Database indexes are much like book indexes.