【文件属性】:
文件名称:SQL语法参考手册-有示例
文件大小:460KB
文件格式:DOC
更新时间:2013-09-19 07:29:14
SQL 语法 手册
Select
用途:
从指定表中取出指定的列的数据
语法:
SELECT column_name(s) FROM table_name
解释:
从数据库中选取资料列,并允许从一或多个资料表中,选取一或多个资料列或资料行。SELECT 陈述式的完整语法相当复杂,但主要子句可摘要为:
SELECT select_list
[ INTO new_table ]
FROM table_source
[ WHERE search_condition ]
[ GROUP BY group_by_expression ]
[ HAVING search_condition ]
[ ORDER BY order_expression [ ASC | DESC ] ]
例:
“Persons” 表中的数据有
LastName FirstName Address City
Hansen Ola Timoteivn 10 Sandnes
Svendson Tove Borgvn 23 Sandnes
Pettersen Kari Storgt 20 Stavanger
选出字段名” LastName”、” FirstName” 的数据
SELECT LastName,FirstName FROM Persons
返回结果: