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第 24 章 SQL Statement Syntax

Structured Query Language

目录

24.1. DISTINCT
24.2. JOIN
24.2.1. LEFT JOIN / LEFT OUTER JOIN
24.2.2. JOIN / INNER JOIN
24.3. order by 排序
24.3.1. 处理 null
24.4. group by
24.4.1. 忽略 NULL
24.5. HAVING
24.6. REGEXP
24.7. IN / NOT IN
24.8. ALL / Any
24.9. exists, not exists
24.10. UNION
24.10.1. UNION ALL
24.10.2. 两张表字段不对等解决方法
24.11. OUTFILE/LOAD DATA INFILE
24.11.1. Export data to CSV from MySQL
24.11.2. Import data from CSV file.
24.12. CASE Syntax
24.13. 查询结果放入变量
24.14. MySQL 专有命令
24.14.1. SQL_NO_CACHE
24.14.2. SIGNAL Syntax
24.15. SQL 92

24.1. DISTINCT

SELECT DISTINCT user.name FROM user

SELECT DISTINCT user.name FROM user