DROP INDEX StatementThe 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; ...
The CREATE INDEX statement creates a partitioning index or a secondary index and an index space at the current server. The columns included in the key of the index are columns of a table at the current server. Invocation for CREATE INDEX This statement can be embedded in an application ...
The statement has been terminated. F. 使用 IGNORE_DUP_KEY 选项 以下示例首先在该选项设置为 IGNORE_DUP_KEY 时在临时表中插入多行,然后在该选项设置为 ON 时执行相同操作,以演示 OFF 选项的影响。 单个行被插入 #Test 表,在执行第二个多行 INSERT 语句时将导致出现重复值。 表中的行计数会返回插入的...
You can use CREATE INDEX to create a pseudo index on a linked table in an ODBC data source, such as Microsoft® SQL Server™, that does not already have an index. You do not need permission or access to the remote server to create a pseudo index, and the remote database is unawar...
CREATE LOGIN (Transact-SQL) CREATE MASTER KEY (Transact-SQL) CREATE MESSAGE TYPE (Transact-SQL) CREATE PARTITION FUNCTION (Transact-SQL) CREATE PARTITION SCHEME (Transact-SQL) CREATE PROCEDURE (Transact-SQL) CREATE QUEUE (Transact-SQL) CREATE REMOTE SERVICE BINDING (Transact-SQL) ...
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...
On multiprocessor computers that are running SQL Server 2016 (13.x) and later versions, index operations can use parallelism to perform the scan and sort operations associated with the index statement. You can use the MAXDOP index option to control the degree of parallelism of the online index ...
These include user-defined type variables or functions and user-defined functions, but can't reference a Transact-SQL statement. partition_number must exist or the statement fails. WITH ( <single_partition_rebuild_index_option> ) SORT_IN_TEMPDB, MAXDOP, DATA_COMPRESSION, and XML_COMPRESSION are...
For a unique index, an error occurs regardless of SQL mode because reducing the index length might enable insertion of nonunique entries that do not meet the specified uniqueness requirement. The statement shown here creates an index using the first 10 characters of the name column (assuming th...
When creating an ordered clustered columnstore index, use the MAXDOP = 1 option for the highest quality sorting, in exchange for a significantly longer duration of the CREATE INDEX statement. To create the index as fast as possible, don't limit MAXDOP. The highest quality of compression and so...