SQL循序渐进(13)ORDER BY子句

发表于:2007-05-25来源:作者:点击数: 标签:sqlORDER子句循序渐进
ORDER BY子句 ORDER BY子句的语法为: SELECT column1, SUM(column2) FROM "list-of-tables" ORDER BY "column-list" [ASC | DESC]; [ ] = optional ORDER BY是一个可选的子句,它允许你根据指定要order by的列来以上升或者下降的顺序来显示查询的结果。例如
ORDER BY子句

ORDER BY子句的语法为:

SELECT column1, SUM(column2)

FROM "list-of-tables"

ORDER BY "column-list" [ASC | DESC];

[ ] = optional

ORDER BY是一个可选的子句,它允许你根据指定要order by的列来以上升或者下降的顺序来显示查询的结果。例如:

ASC = Ascending Order – 这个是缺省的

DESC = Descending Order

下面举个例子:

SELECT employee_id, dept, name, age, salary

FROM employee_info

WHERE dept = 'Sales'

ORDER BY salary;

这条SQL语句将从employee_info表中列dept等于'Sales'选择employee_id,、dept、 name、 age和 salary,并且根据他们的salary按升序的顺序来列出检索结果。

如果你想对多列排序的话,那么在列与列之间要加上逗号,比如 :

SELECT employee_id, dept, name, age, salary

FROM employee_info

WHERE dept = 'Sales'

ORDER BY salary, age DESC;

原文转自:http://www.ltesting.net