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

今天聊點不一樣的東西，有點不起眼卻很重要的小玩意：UUID (或是微軟的GUID)。 ... 有順序的UUID 除了排序時方便，在當作MySQL 的主鍵(primary key)， ... 閒...

What is UUID? UUIDs stands for Universally Unique Identifiers, used to uniquely identify the tabl...

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

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

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