MapReduce服务 MRS-SELECT:语法

时间：2023-11-01 16:25:24

MapReduce服务 MRS DQL 语法

[/*+ query_rewrite_hint*/]

[ WITH with_query [, ...] ]

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

[ FROM from_item [, ...] ]

JOIN table_reference

[ON join_equality_clauses | USING (col1[, col2 ...]] ...

[ 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 [, ...] ) ]
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 [, ...] )