Here, the SQL command creates an index namedcollege_indexon theCollegestable using thecollege_codecolumn. SQL CREATE INDEX Syntax The syntax of the SQLCREATE INDEXstatement is: CREATEINDEXindex_nameONtable_name (column_name1, column_name2, ...); Here, index_nameis the name given to the in...
CREATE INDEX ExampleThe SQL statement below creates an index named "idx_lastname" on the "LastName" column in the "Persons" table:CREATE INDEX idx_lastname ON Persons (LastName); If you want to create an index on a combination of columns, you can list the column names within the ...
CREATE INDEX 语句用于对数据库表定义索引。 可以对 XML 数据或关系数据定义索引。 CREATE INDEX 语句还用于创建索引规范(就是用来向优化器指示数据源表具有索引的元数据)。 调用 此语句可以嵌入在应用程序中,也可通过动态 SQL 语句来发出。 它是一个可执行语句,仅当 DYNAMICRULES 运行行为对于程序包有效时才能动态...
1 CREATE INDEX idx_full_name ON employees (first_name, last_name); Example of creating a unique index: 1 CREATE UNIQUE INDEX idx_unique_email ON users (email); By identifying the particular columns utilized in filtering, joining, sorting, and text-based search operations and employing the CR...
"Bitmap Index Example" schema Specify the schema to contain the index. If you omitschema, then Oracle Database creates the index in your own schema. index Specify the name of the index to be created. See Also: "Creating an Index: Example"and"Creating an Index on an XMLType Table: Exam...
For information on creating an XML index, seeCREATE XML INDEX (Transact-SQL). WHERE <filter_predicate> Creates a filtered index by specifying which rows to include in the index. The filtered index must be a nonclustered index on a table. Creates filtered statistics for the data rows in the...
Also, using column prefixes for indexes can make the index file much smaller, which could save a lot of disk space and might also speed up INSERT operations. Functional Key Parts A “normal” index indexes column values or prefixes of column values. For example, in the following table, ...
CREATE INDEXTYPE CREATE INMEMORY JOIN GROUP CREATE JAVA 14 SQL Statements: CREATE LIBRARY to CREATE SCHEMA 15 SQL Statements: CREATE SEQUENCE to DROP CLUSTER 16 SQL Statements: DROP CONTEXT to DROP JAVA 17 SQL Statements: DROP LIBRARY to DROP SYNONYM 18 SQL Statements: DROP TABLE to LOCK TABLE...
Create an indexed view: a T-SQL example The following example creates a view and an index on that view, in the AdventureWorks database. SQL Copy --Set the options to support indexed views. SET NUMERIC_ROUNDABORT OFF; SET ANSI_PADDING, ANSI_WARNINGS, CONCAT_NULL_YIELDS_NULL, ARITHABORT, ...
Copy and paste the following example into the query window and selectExecute. SQL USEAdventureWorks2022; GO-- Find an existing index named IX_ProductVendor_VendorID and delete it if found.IF EXISTS (SELECTnameFROMsys.indexesWHEREname= N'IX_ProductVendor_VendorID')DROPINDEXIX_ProductVendor_Vendor...