Shulou(Shulou.com)05/31 Report--

In this issue, the editor will bring you about how to create new tables and multi-table queries in mysql. The article is rich in content and analyzes and describes for you from a professional point of view. I hope you can get something after reading this article.

DROP TABLE IF EXISTS cart

CREATE TABLE cart (

Id int primary key auto_increment

MemberId int

Comment test

);

Clear the cart table if it exists

New cart table, id, type int, primary key

MemberId, type int

Comment type test

DROP TABLE IF EXISTS member

CREATE TABLE member (

Id int primary key auto_increment

Name varchar (10) default null unique key

Pwd varchar (30) default 123456

);

Clear if the member table exists

New member table, id, type int, primary key

Name type varchar, cannot be repeated and cannot be empty

Pwd type varchar defaults to 123456

Check the purchases and comments made by tom and jack respectively, and write them in two ways.

The above is how to create new tables and multi-table queries in mysql shared by Xiaobian. If you happen to have similar doubts, you might as well refer to the above analysis to understand. If you want to know more about it, you are welcome to follow the industry information channel.

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