SELECT (Transact-SQL)
從資料庫中擷取資料列，可讓您從一或多份資料表中選取一或多個資料列或資料行。SELECT 陳述式的完整語法很複雜，但主要子句可以摘要如下：
[ 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 ] ]
您可以在查詢之間使用 UNION、EXCEPT 和 INTERSECT 運算子來比較它們的結果，或將它們的結果結合在單一結果集中。
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 > ]
