SELECT (Transact-SQL)
从数据库中检索行，并允许从一个或多个表中选择一个或多个行或列。 虽然 SELECT 语句的完整语法较复杂，但其主要子句可归纳如下：
[ WITH <common_table_expression>]
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 ] ]
可在查询之间使用 UNION、EXCEPT 和 INTERSECT 运算符将查询结果合并或比较到一个结果集中。
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语法
SELECT statement ::=
[WITH <common_table_expression> [,...n]]
<query_expression>
[ ORDER BY { order_by_expression | column_position [ ASC | DESC ] }
[ ,...n ] ]
[ COMPUTE
{ { AVG | COUNT | MAX | MIN | SUM } ( expression ) } [ ,...n ]
[ BY expression [ ,...n ] ]
]
[ <FOR Clause>]
[ OPTION ( <query_hint> [ ,...n ] ) ]
<query_expression> ::=
{ <query_specification> | ( <query_expression> ) }
[ { UNION [ ALL ] | EXCEPT | INTERSECT }
<query_specification> | ( <query_expression> ) [...n ] ]
<query_specification> ::=
SELECT [ ALL | DISTINCT ]
[TOP expression [PERCENT] [ WITH TIES ] ]
< select_list >
[ INTO new_table ]
[ FROM { <table_source> } [ ,...n ] ]
[ WHERE <search_condition> ]
[ GROUP BY [ ALL ] group_by_expression [ ,...n ]
[ WITH { CUBE | ROLLUP } ]
]
[ HAVING < search_condition > ]
备注
由于 SELECT 语句的复杂性，下面按子句说明详细的语法元素和参数：