xgqfrms / mysql

MySQL All in One (relational database management system / 关系数据库管理系统)
https://mysql.xgqfrms.xyz
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MySQL 创建数据表 #8

Open xgqfrms opened 1 year ago

xgqfrms commented 1 year ago

MySQL 创建数据表

https://leetcode.cn/study-plan/sql/?progress=sjohlim

https://leetcode.cn/problems/employees-with-missing-information/

表: Employees

Column Name Type
employee_id int
name varchar

employee_id 是这个表的主键。 每一行表示雇员的id 和他的姓名。

表: Salaries

Column Name Type
employee_id int
salary int

employee_id is 这个表的主键。 每一行表示雇员的id 和他的薪水。

xgqfrms commented 1 year ago

sql

# CREATE TABLE table_name (column_name column_type);

CREATE TABLE IF NOT EXISTS `Employees` (
   `employee_id` INT UNSIGNED AUTO_INCREMENT,
   `name` VARCHAR(100),
   PRIMARY KEY ( `employee_id` )
)ENGINE=InnoDB DEFAULT CHARSET=utf8;
# CREATE TABLE table_name (column_name column_type);

CREATE TABLE IF NOT EXISTS `Salaries` (
   `employee_id` INT UNSIGNED AUTO_INCREMENT,
   `salary` INT,
   PRIMARY KEY ( `employee_id` )
)ENGINE=InnoDB DEFAULT CHARSET=utf8;

空格 bug ❌

image

OK ✅

image

https://www.runoob.com/mysql/mysql-create-tables.html