WebMar 29, 2024 · CREATE UNIQUE NONCLUSTERED INDEX Users_400k_Club_NoInclude ON dbo.Users ( DisplayName, Id ) WHERE Reputation & gt; 400000; This index takes the users who have more than 400k reputation, and orders them by DisplayName and Id. It can be unique because (assumedly) the Id column is already unique. WebFeb 8, 2016 · Filtered indexes do not allow the IGNORE_DUP_KEY option. There is a workaround, however, if you can afford a small change to the table's structure. With the …
SQL Server Filtered Index by Examples - SQL Server …
WebNov 12, 2013 · What You Can do in a Filtered Index… Use equality or inequality operators, such as =, >=, <, and more in the WHERE clause. Use IN to create an index for a range of values. (This can support a query … When a column only has a few relevant values for queries, you can create a filtered index on the subset of values. The resulting index will be smaller and cost less to maintain than a full-table nonclustered index defined on the same key columns. For example, consider a filtered index in the following data scenarios. … See more Requires ALTER permission on the table or view. The user must be a member of the sysadmin fixed server role or the db_ddladmin and db_owner fixed database roles. To modify the filtered index expression, … See more This example uses the AdventureWorks2024 database, available for download at AdventureWorks sample databases. 1. In Object Explorer, connect to an instance of Database Engine. 2. On the Standard bar, … See more include graphics h
Create Unique Indexes - SQL Server Microsoft Learn
WebMySQL currently doesn't support conditional indexes. To achive what you are asking (not that you should do it ;) ) you can start creating an auxiliary table: CREATE TABLE `my_schema`.`auxiliary_table` ( `id` int unsigned NOT NULL, `name` varchar (250), /* specify the same way as in your main table */ PRIMARY KEY (`id`), KEY `name` (`name ... WebCreate a unique non-clustered index using CREATE INDEX. CREATE TABLE MyTable ( Col1 INT NOT NULL PRIMARY KEY CLUSTERED, Col2 VARCHAR (20) NOT NULL ); CREATE UNIQUE NONCLUSTERED INDEX IDX1 ON MyTable (Col2); Filtered Indexes and Covering Indexes SQL Server also supports two special options for non-clustered … WebThe following syntax illustrates how to create a filtered index: CREATE INDEX index_name ON table_name (column_list) WHERE predicate; Code language: SQL (Structured Query Language) (sql) In this syntax: First, specify the name of the filtered index after the CREATE INDEX clause. incyte grants and giving