In summary, primary keys uniquely identify rows in a table. You can create a primary key in a cou...

What I always do, even if it's redundant is I create primary key ... CREATE TABLE users( pk INT N...

UUID as Primary Key. 22 March 2014. 最近有個小小專案，該專案用PostgreSQL，該案按照我們新專案的慣例，採用UUID 當做主鍵，而不是用資料庫自動產生的...

With uuid as a primary key, it could have been generated on the client side (the app), so that th...

A primary key is, by definition unique within its scope. It is, therefore, an obvious thing to us...

The clustered index orders the rows automatically by the primary key. When you insert a new row w...