);-- create indexCREATEINDEXcollege_indexONColleges(college_code); 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, colu...
For our examples, we’ll work with a non-clustered index,IX_ExpectedDeliveryDate, on thePurchasing.PurchaseOrderstable in the WideWorldImporters sample database. To disable with SQL Server Management Studio (SSMS), expand down to the index in the Object Explorer Right-click on the index to di...
For columnstore indexes in SQL Server (Starting with SQL Server 2016 (13.x)) and Azure SQL Database, REORGANIZE performs the following extra defragmentation optimizations online:Physically removes rows from a rowgroup when 10% or more of the rows have been logically deleted. The deleted bytes ...
In the above example we use a create table statement to create a new table name as emp with different attributes such as emp_first_name, emp_last_name and email with text data type and not null constraint as shown in above statement. The end out of the above statement we illustrated by...
SQL CREATE UNIQUE INDEX A UNIQUE INDEX comes only once in a table. This INDEX assures that value of a column or value of a combination of one or more columns can not appear more than once in a table. Example : Sample table : customer ...
For more information, seeDynamic Management Views and Functions (Transact-SQL). Examples A. Returning information for a specified table The following example returns information for all indexes and partitions of thePerson.Addresstable in the AdventureWorks2022 database. Executing this query requires, at...
The PATINDEX function is used to get the first occurrence of a pattern from a string/expression. The function returns an integer value of where the pattern exists in the string if found otherwise it returns 0. Syntax PATINDEX('pattern', expression) ...
The following examples set the properties of indexes in the AdventureWorks database.SQL Copy ALTER INDEX AK_SalesOrderHeader_SalesOrderNumber ON Sales.SalesOrderHeader SET ( STATISTICS_NORECOMPUTE = ON, IGNORE_DUP_KEY = ON, ALLOW_PAGE_LOCKS = ON ) ; ...
It is the functional index defined on the virtual column of values from the SQL data type array that forms the multi-valued index. The examples in the following list show the three different ways in which a multi-valued index zips can be created on an array $.zipcode on a JSON column...
Oracle Database Concepts and Oracle Database SQL Tuning Guide for more information about using bitmap indexes CREATE TABLE for information on mapping tables "Bitmap Index Examples" schema Specify the schema to contain the index. If you omit schema, then Oracle Database creates the index in ...