SELECT

语法

[/*+ query_rewrite_hint*/]

[ WITH [ RECURSIVE ] with_query [, ...] ]

SELECT [ ALL | DISTINCT ] select_expression [, ...]

[ FROM from_item [, ...] ]

[ WHERE condition ]

[ GROUP BY [ ALL | DISTINCT ] grouping_element [, ...] ]

[ HAVING condition]

[ { UNION | INTERSECT | EXCEPT } [ ALL | DISTINCT ] select ]

[ ORDER BY expression [ ASC | DESC ] [, ...] ]

[ OFFSET count [ ROW | ROWS ] ]

[ LIMIT { count | ALL } ]

[ FETCH { FIRST | NEXT } [ count ] { ROW | ROWS } { ONLY | WITH TIES } ]

• from_item可以是以下形式：
  • table_name [ [ AS ] alias [ ( column_alias [, ...] ) ] ]
  • from_item join_type from_item [ ON join_condition | USING ( join_column [, ...] ) ]
  • table_name [ [ AS ] alias [ ( column_alias [, ...] ) ] ]

    MATCH_RECOGNIZE pattern_recognition_specification

    [ [ AS ] alias [ ( column_alias [, ...] ) ] ]

• join_type可以是以下形式：
  • [ INNER ] JOIN
  • LEFT [ OUTER ] JOIN
  • RIGHT [ OUTER ] JOIN
  • FULL [ OUTER ] JOIN
  • LEFT [SEMI] JOIN
  • RIGHT [SEMI] JOIN
  • LEFT [ANTI] JOIN
  • RIGHT [ANTI] JOIN
  • CROSS JOIN
• grouping_element可以是以下形式：
  • ()
  • expression
  • GROUPING SETS ( ( column [, ...] ) [, ...] )
  • CUBE ( column [, ...] )
  • ROLLUP ( column [, ...] )

描述

从零个或多个表中检索行数据。

查询stu表的内容。

SELECT id,name FROM stu;