The default database main key, foreign key, and the only key index

引言 在这篇文章中,We'll see in useOracle、SQL Server、PostgreSQL和MySQL时,Default database primary key、What are foreign key and unique key indexing strategies.所以,If you're wondering if these top-level relational databases are adding primary keys to you、Default indexes are created when foreign key or unique key constraints are used,Then this article will give you the answers you've been waiting for.数据库表 Let's assume we have the followingpost和post_comment表,They form a one-to-many table relationship.该...阅读更多

The postDefault Database Primary, Foreign, and Unique Key Indexingappeared first onVlad Mihalcea.