MySQL是一種流行的關系型數(shù)據(jù)庫管理系統(tǒng)，它具有高度可靠性和卓越的性能。MySQL的基礎知識對于想要深入學習和了解數(shù)據(jù)管理的人來說是非常重要的。在這篇文章中，我們將介紹MySQL的16個基礎知識。

1. 安裝MySQL

在Linux上安裝MySQL：
sudo apt-get update
sudo apt-get install mysql-server

2. 創(chuàng)建數(shù)據(jù)庫

CREATE DATABASE dbname;

3. 創(chuàng)建表格

CREATE TABLE tablename (
column1 datatype,
column2 datatype,
column3 datatype,
.....
);

4. 插入數(shù)據(jù)

INSERT INTO tablename (column1, column2, column3, ...) VALUES (value1, value2, value3, ...);

5. 選擇數(shù)據(jù)

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

6. 更新數(shù)據(jù)

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

7. 刪除數(shù)據(jù)

DELETE FROM tablename WHERE condition;

8. 過濾數(shù)據(jù)

SELECT column1, column2, ... FROM tablename WHERE column1 = value1;

9. 排序數(shù)據(jù)

SELECT column1, column2, ... FROM tablename ORDER BY column1 ASC|DESC;

10. 限制數(shù)據(jù)

SELECT column1, column2, ... FROM tablename LIMIT 10;

11. 連接表格

SELECT column1, column2, ... FROM tablename1 INNER JOIN tablename2 ON condition;

12. 組合查詢結果

SELECT column1, column2, ... FROM tablename1 UNION SELECT column1, column2, ... FROM tablename2;

13. 聚合函數(shù)

SELECT COUNT(*) FROM tablename;

14. 分組數(shù)據(jù)

SELECT column1, COUNT(column2) FROM tablename GROUP BY column1;

15. 多層嵌套子查詢

SELECT column1 FROM tablename WHERE column2 IN (SELECT column2 FROM tablename WHERE condition);

16. 索引優(yōu)化

CREATE INDEX indexname ON tablename (columnname);