A filtered index is an optimized disk-based rowstore nonclustered index especially suited to cover queries that select from a well-defined subset of data.
A filtered index is an optimized disk-based rowstore nonclustered index especially suited to cover queries that select from a well-defined subset of data.
Create a filtered index with SSMS Show 2 more Applies to: SQL Server Azure SQL Database Azure SQL Managed Instance SQL database in Microsoft FabricThis article describes how to create a filtered index using SQL Server Management Studio (SSMS) or Transact-SQL. A filtered index is an optimiz...
A filtered index is an optimized disk-based rowstore nonclustered index especially suited to cover queries that select from a well-defined subset of data.
# 创建索引CREATE UNIQUE INDEX idx_name ON member(name)# 修改表结构ALTER TABLE member ADD UNIQUE INDEX idx_name (name)#创建表直接指定CREATE TABLE mytable( id INT NOT NULL, username VARCHAR(16) NOT NULL, UNIQUE INDEX idx_name (username(2)) ) ...
CREATEINDEXidx_filtered_indexONtable_name(column_name)WHEREcondition; 1. idx_filtered_index是指定的索引名称。 table_name是要创建索引的表名称。 column_name是要创建索引的列名称。 condition是过滤条件,只有满足该条件的数据才会被索引。 使用Filtered Index ...
create unique index production.nullidx on production.product(code) where production.product(code) is not null So the filter takes out the nulls. Apparently this is also really useful if you are migrating your database from another provider to SQL Server. ...
Filtered index concept is new feature added from SQL Server 2008. A filtered index is an optimized nonclustered index, especially suited to cover queries that select from a well-defined subset of data. It uses a filter predicate to index a portion of rows in the table. Pros: Improved query...
During a recent SQL Server Performance Tuning consultation, I was asked a fascinating question by a Senior DBA working with me from the client-side. Let me share this query, as I believe you will find it intriguing as well. “We often create an index on the columns used in the WHERE cl...
In this article Design considerations Limitations and restrictions Permissions Create a filtered index with SSMS Show 2 more Applies to:SQL ServerAzure SQL DatabaseAzure SQL Managed Instance This article describes how to create a filtered index using SQL Server Management Studio (SSMS) or Transact-SQL...