云数据库 GAUSSDB-CREATE INDEX:语法格式

时间：2024-11-13 14:46:21

云数据库 GAUSSDB C

语法格式

在表上创建索引。

    
         CREATE [ UNIQUE ] INDEX [ CONCURRENTLY ] [ IF NOT EXISTS ] [ [schema_name.] index_name ] ON table_name [ USING method ]
    ({ { column_name [ ( length ) ] | ( expression ) } [ COLLATE collation ] [ opclass ] [ ASC | DESC ] [ NULLS { FIRST | LAST } ] }[, ...] )
    [ INCLUDE ( column_name [, ...] ) ]
    [ WITH ( {storage_parameter = value} [, ... ] ) ]
    [ TABLESPACE tablespace_name ] 
    { [ COMMENT 'string' ] [ ... ] }
    [ { VISIBLE | INVISIBLE } ]
    [ WHERE predicate ];

在分区表上创建索引。

    
         CREATE [ UNIQUE ] INDEX [ CONCURRENTLY ] [ [schema_name.] index_name ] ON table_name [ USING method ]
    ( { { column_name [ ( length ) ] | ( expression ) } [ COLLATE collation ] [ opclass ] [ ASC | DESC ] [ NULLS LAST ] } [, ...] )
    [ LOCAL
        [ ( { PARTITION index_partition_name [ FOR { partition_name | ( partition_value [, ...] ) } ] [ TABLESPACE index_partition_tablespace ]
                [ ( [SUBPARTITION index_subpartition_name] [ FOR { partition_name | ( partition_value [, ...] ) } ]  [ TABLESPACE index_partition_tablespace ]
                    [, ...] ) ]
            [, ...] } ) ]
        | GLOBAL ]
    [ INCLUDE ( column_name [, ...] ) ]
    [ WITH ( { storage_parameter = value } [, ...] ) ]
    [ TABLESPACE tablespace_name ] 
    { [ COMMENT 'string' ] [ ... ] }
    [ { VISIBLE | INVISIBLE } ];