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MySQL Database Constraints
2022-07-06 13:14:00 【Born like summer flowers LXM】
The definition of constraints
Classification of constraints
Primary key constraint
A primary key composed of multiple columns : Combined the primary key
The primary key grows by itself
Uniqueness constraint
Non null and default constraints
Default constraint
Check constraint
Foreign key constraints ( Most used constraints )
Write the primary key first and then the foreign key
Comprehensive practice
The database model can use this software
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