How do you set a primary key variable in SQL?

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You can test that the primary key constraint works by trying to insert duplicates: e.g., INSERT INTO @statistictemp(MajorName, SubName, .Creating an index on a table variable - Stack OverflowUsing Primary Key on Table Variable to improve seek performanceSQL Server: creating table variable, error in primary key constraint .Compound primary key in Table type variable - Stack OverflowДругие результаты с сайта stackoverflow.com

How do you set a primary key attribute in SQL?

The syntax to create a primary key using the ALTER TABLE statement in SQL is: ALTER TABLE table_name ADD CONSTRAINT constraint_name PRIMARY KEY (column1, column2, ... column_n); table_name.

How do you set a variable in SQL query?

When a variable is first declared, its value is set to NULL. To assign a value to a variable, use the SET statement. This is the preferred method of assigning a value to a variable. A variable can also have a value assigned by being referenced in the select list of a SELECT statement.

Can we create primary key on table variable in SQL Server?

Table variables allow us to create the following constraints: Primary Key. Unique.

Can you insert a primary key in SQL?

How to Add Primary Key to Existing Table in SQL? Now we will see how to add Primary Key to existing table in SQL: You can use the ALTER statement to create a primary key. However, the primary key can only be created on columns that are defined as NOT NULL.

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