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CREATE UNIQUE INDEX. The CREATE UNIQUE INDEX command creates a unique index on a table (no duplicate values allowed) Indexes are used to retrieve data from the database very fast. The users cannot see the indexes, they are just used to speed up searches/queries.
- CREATE VIEW
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- CREATE VIEW
5 Μαΐ 2023 · This topic describes how to create a unique index on a table in SQL Server by using SQL Server Management Studio or Transact-SQL. A unique index guarantees that the index key contains no duplicate values and therefore every row in the table is in some way unique.
Learn about SQL Server unique indexes and how to use them to enforce the uniqueness of values in one or more columns of a table.
The objective of this SQL Server tutorial is to teach you what is a unique index and how to create it on a table or view. Introduction to SQL Server Unique Index. A unique index is an index with a unique key.
2 Αυγ 2021 · Learn how to create and use a Unique Index to enforce uniqueness on a column other than the Primary Key. See examples, syntax, tips and tricks, and the difference between a Unique Index and a Unique Constraint.
20 Δεκ 2023 · You can create a unique constraint in SQL Server by using SQL Server Management Studio or Transact-SQL to ensure no duplicate values are entered in specific columns that don't participate in a primary key. Creating a unique constraint automatically creates a corresponding unique index.
You can create nonclustered indexes in SQL Server by using SQL Server Management Studio or Transact-SQL. A nonclustered index is an index structure separate from the data stored in a table that reorders one or more selected columns.
