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What is an index in SQL?
https://stackoverflow.com/questions/2955459/what-is-an-index-in-sql
QuestionAnswer442edited Jan 9, 2023 at 8:24An index is used to speed up searching in the database. MySQL has some good documentation on the subject (which is relevant for other SQL servers as well):
http://dev.mysql.com/doc/refman/5.0/en/mysql-indexes.html
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CREATE INDEX (Transact-SQL) - SQL Server | Microsoft Learn
https://learn.microsoft.com/en-us/sql/t-sql/statements/create-index-transact-sql?view=sql-server-ver16
Starting with SQL Server 2016 (13.x) and in Azure SQL Database, you can create a nonclustered index on a table stored as a clustered columnstore index. If you first cr… Applies to: SQL Server Azure SQL Database Azure SQL Managed Instanc… Creates a relational index on a table or view. Also called a rowstore index beca… UNIQUE Creates a unique index on a table or view. A unique index is one in which no two rows are permitted to have the same ind… The CREATE INDEX statement is optimized like any other query. To save on I/O operations, the query processor ma…
Starting with SQL Server 2016 (13.x) and in Azure SQL Database, you can create a nonclustered index on a table stored as a clustered columnstore index. If you first cr…
Applies to: SQL Server Azure SQL Database Azure SQL Managed Instanc…
Creates a relational index on a table or view. Also called a rowstore index beca…
UNIQUE
Creates a unique index on a table or view. A unique index is one in which no two rows are permitted to have the same ind…
The CREATE INDEX statement is optimized like any other query. To save on I/O operations, the query processor ma…
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indexing - What is an index in SQL? - Stack Overflow
https://stackoverflow.com/questions/2955459/what-is-an-index-in-sql
WEBJun 2, 2010 · An index is an on-disk structure associated with a table or view that speeds retrieval of rows from the table or view. An index contains keys built from one or more columns in the table or view. …
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Understanding SQL Server Indexing
https://www.mssqltips.com/sqlservertip/1206/understanding-sql-server-indexing/
WEBSolution. From a simple standpoint SQL Server offers two types of indexes clustered and non-clustered. In its simplest definition a clustered index …
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Indexes - SQL Server | Microsoft Learn
https://learn.microsoft.com/en-us/sql/relational-databases/indexes/indexes?view=sql-server-ver16
WEBApr 4, 2023 · The following table lists the types of indexes available in SQL Server and provides links to additional information. Expand table. Note. SQL Server documentation …
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An Essential Guide to SQL Server Indexes
https://www.sqlservertutorial.net/sql-server-indexes/
WEBIndexes are special data structures associated with tables or views that help speed up the query. SQL Server provides two types of indexes: clustered index and non …
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SQL Server CREATE INDEX Statement
https://www.sqlservertutorial.net/sql-server-indexes/sql-server-create-index/
WEB1) Using the CREATE INDEX statement to create a nonclustered index for one column example. This statement finds customers who are located in Atwater: SELECT . …
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SQL CREATE INDEX Statement - W3Schools
https://www.w3schools.com/sql/sql_create_index.asp
WEBCREATE INDEX Example. The SQL statement below creates an index named "idx_lastname" on the "LastName" column in the "Persons" table: CREATE INDEX …
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Clustered and nonclustered indexes - SQL Server
https://learn.microsoft.com/en-us/sql/relational-databases/indexes/clustered-and-nonclustered-indexes-described?view=sql-server-ver16
WEBAug 14, 2023 · SQL Server automatically creates indexes when PRIMARY KEY and UNIQUE constraints are defined on table columns. For example, when you create a …
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