以下是SELECT子句的语法形式示例:SELECT [ ALL | DISTINCT ] [ TOP n [ PERCENT ] [ WITH TIES ] ] < select_list > ::= { * | { table_name | view_name | table_alias }.* | { column_name | expression | IDENTITYCOL | ROWGUIDCOL } [ [ AS ] column_alias ] | column_alias = expression } [ ,...n ]