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知乎专栏

第 6 章 SQL Statement Syntax

Structured Query Language

目录

6.1. DISTINCT
6.2. JOIN
6.2.1. LEFT JOIN / LEFT OUTER JOIN
6.2.2. JOIN / INNER JOIN
6.3. order by 排序
6.3.1. 处理 null
6.4. group by
6.4.1. 忽略 NULL
6.5. HAVING
6.6. REGEXP
6.7. IN / NOT IN
6.8. ALL / Any
6.9. exists, not exists
6.10. UNION
6.10.1. UNION ALL
6.10.2. 两张表字段不对等解决方法
6.11. OUTFILE/LOAD DATA INFILE
6.11.1. Export data to CSV from MySQL
6.11.2. Import data from CSV file.
6.12. CASE Syntax
6.13. 查询结果放入变量
6.14. MySQL 专有命令
6.14.1. SQL_NO_CACHE
6.14.2. SIGNAL Syntax
6.15. SQL 92

6.1. DISTINCT

SELECT DISTINCT user.name FROM user

SELECT DISTINCT user.name FROM user