CREATE [TEMPORARY] TABLEtable(field1 type[(size)] [NOT NULL] [WITH COMPRESSION | WITH COMP] [index1] [,field2type[(size)] [NOT NULL] [index2] [, ...]] [, CONSTRAINTmultifieldindex[, ...]]) The CREATE TABLE statement has these parts: Remarks Use the CREATE TABLE statement to d...
The DROP INDEX statement is used to delete an index in a table.MS Access:DROP INDEX index_name ON table_name; SQL Server:DROP INDEX table_name.index_name; DB2/Oracle:DROP INDEX index_name; MySQL:ALTER TABLE table_nameDROP INDEX index_name; ...
You can create a multi-valued index in a CREATE TABLE, ALTER TABLE, or CREATE INDEX statement. This requires using CAST(... AS ... ARRAY) in the index definition, which casts same-typed scalar values in a JSON array to an SQL data type array. A virtual column is then generated trans...
CREATE [TEMPORARY] TABLE table (field1 type [(size)] [NOT NULL] [WITH COMPRESSION | WITH COMP] [index1] [, field2 type [(size)] [NOT NULL] [index2] [, …]] [, CONSTRAINT multifieldindex [, …]])The CREATE TABLE statement has these parts:...
1In a federated system,table-namemust identify a table in the federated database. It cannot identify a data source table. 2Ifnicknameis specified, the CREATE INDEX statement creates an index specification. In this case, INCLUDE,xml-index-specification, CLUSTER, EXTEND USING, PCTFREE, MINPCTUSED...
See Section 13.7.5.22, “SHOW INDEX Statement”. KEY | INDEX KEY is normally a synonym for INDEX. The key attribute PRIMARY KEY can also be specified as just KEY when given in a column definition. This was implemented for compatibility with other database systems. UNIQUE A UNIQUE ...
<index_column_name> ::= <column_name> [ASC|DESC] ExamplesSQL Tutorial, IndexesExplanationIndexes provide access to the table data via non-key columns. Maintaining these indexes, however, can be quite complex in the case of an INSERT, UPDATE, or DELETE statement....
在上下文 CREATE INDEX中, "default"[default] 不指示数据库默认文件组。 它们指示基表或视图使用的文件组或分区方案。 这不同于 CREATE TABLE数据库默认文件组上表的位置 "default" 和[default] 位置。 [ FILESTREAM_ON { filestream_filegroup_namepartition_scheme_name | "NULL" } ] 在创建聚集索引时,指定...
CREATE [ UNIQUE ] INDEXindex ONtable(field[ASC|DESC][,field[ASC|DESC], ...]) [WITH { PRIMARY | DISALLOW NULL | IGNORE NULL }] The CREATE INDEX statement has these parts: Remarks To prohibit duplicate values in the indexed field or fields of different records, use the UNIQUE reserved ...
CREATE TABLE { database_name.schema_name.table_name | schema_name.table_name | table_name } ( { <column_definition> | [ <table_constraint> ] [ ,... n ] | [ <table_index> ] [ ,... n ] } [ PERIOD FOR SYSTEM_TIME ( system_start_time_column_name , system_end_time_column_...