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  1. learn.microsoft.com › en-us › sqlCreate primary keys in SQL Server - SQL Server | Microsoft Learn

    18 Απρ 2024 · You can define a primary key in the SQL Server Database Engine by using SQL Server Management Studio or Transact-SQL. Creating a primary key automatically creates a corresponding unique clustered index. However, your primary key can be specified as a nonclustered index instead.

  2. www.w3schools.com › sql › sql_primarykeySQL PRIMARY KEY Constraint - W3Schools

    The PRIMARY KEY constraint uniquely identifies each record in a table. Primary keys must contain UNIQUE values, and cannot contain NULL values. A table can have only ONE primary key; and in the table, this primary key can consist of single or multiple columns (fields).

  3. database.guide › how-to-create-a-primary-key-in-sql-server-t-sql-examplesHow to Create a Primary Key in SQL Server (T-SQL Examples) -...

    5 Αυγ 2019 · This article demonstrates how to create a primary key in SQL Server when creating a table using Transact-SQL. A primary key is one or more columns that have been configured as the unique identifier for a given table. Primary keys can be used to enforce data integrity in the table.

  4. database.guide › how-to-add-a-primary-key-to-an-existing-table-in-sql-server-tHow to Add a Primary Key to an Existing Table in SQL Server...

    5 Αυγ 2019 · This article demonstrates how to add a primary key to an existing table in SQL Server using Transact-SQL. A primary key is a column that has been configured as the unique identifier for a given table.

  5. www.sqlservertutorial.net › sql-server-basics › sql-server-primary-keySQL Server PRIMARY KEY - SQL Server Tutorial

    A primary key is a column or a group of columns that uniquely identifies each row in a table. You create a primary key for a table by using the PRIMARY KEY constraint. If the primary key consists of only one column, you can define use PRIMARY KEY constraint as a column constraint: CREATE TABLE table_name (.

  6. www.guru99.com › sql-server-primary-keySQL PRIMARY KEY: How to Create & Add to Existing Table - Guru99

    28 Ιουν 2024 · T-SQL: Create a Primary key while creating a New Table. Below is the syntax to create table with Primary Key from T-SQL. Syntax: CREATE TABLE <Table_Name> ( Column1 datatype, Column2 datatype,CONSTRAINT <Name> PRIMARY KEY (Column name) . ); Let’s create a Table with One Column as a SQL Primary Key. Query:

  7. www.sqlservertutorial.org › sql-server-primary-keySQL Server PRIMARY KEY Constraint - SQL Server Tutorial

    A PRIMARY KEY can be defined on a column or multiple columns while creating a table or later. It is also possible to drop a PRIMARY KEY in a table if not required. SQL Server PRIMARY KEY Syntax. The basic syntax of adding PRIMARY KEY using CREATE TABLE and ALTER TABLE statements and dropping PRIMARY KEY using DROP TABLE statement is given below.

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