时间:2021-07-01 10:21:17 帮助过:5人阅读
http://www.w3school.com.cn/sql/sql_distinct.asp
SQL SELECT DISTINCT
关键词DISTINCT用于返回唯一不同的值。
语法:
SELECT DISTINCT column_name from table_name
实例:
"Orders"表
Company | OrderNumber |
---|---|
IBM | 3532 |
W3School | 2356 |
Apple | 4698 |
W3School | 6953 |
select Company from Orders
返回结果:
Company |
---|
IBM |
W3School |
Apple |
W3School |
select distinct Company from Orders
返回结果:
Company |
---|
IBM |
W3School |
Apple |
SQL- select distinct
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