MySQL 语法SQL 命令解析-Toy模板网

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MySQL 是一种常用的关系型数据库管理系统，使用 SQL（Structured Query Language）作为操作数据库的语言。

一、数据库操作

CREATE DATABASE database_name;

DROP DATABASE database_name;

USE database_name;

1.创建 table_name 的表，包含指定的列和约束文章来源地址https://www.toymoban.com/news/detail-516238.html

CREATE TABLE table_name (
  column1 datatype constraint,
  column2 datatype constraint,
  ...
);

DROP TABLE table_name;

ALTER TABLE table_name
  ADD column_name datatype constraint,
  MODIFY column_name datatype constraint,
  DROP column_name;

INSERT INTO table_name (column1, column2, ...)
VALUES (value1, value2, ...);

SELECT column1, column2, ...
FROM table_name
WHERE condition;

UPDATE table_name
SET column1 = value1, column2 = value2, ...
WHERE condition;

DELETE FROM table_name
WHERE condition;

SELECT column1, column2, ...
FROM table_name
WHERE condition;

SELECT column1, column2, ...
FROM table_name
ORDER BY column1 ASC, column2 DESC;

SELECT COUNT(column), SUM(column), AVG(column), MAX(column), MIN(column)
FROM table_name;

SELECT column1, aggregate_function(column2)
FROM table_name
GROUP BY column1;

SELECT column1, column2, ...
FROM table1
INNER JOIN table2
ON table1.column = table2.column;

SELECT column1, column2, ...
FROM table1
LEFT JOIN table2
ON table1.column = table

2.column;

CREATE INDEX index_name
ON table_name (column1, column2, ...);

EXPLAIN SELECT column1, column2, ...
FROM table_name
WHERE condition;

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