Generate Unique Key In C To Sql

12.04.2020 admin

By: Percy Reyes Updated: 2019-10-31 Comments (16) Related: More >Constraints

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Sep 25, 2009 SQL Server contains the NEWID function. This function creates a unique value of type uniqueidentifier. We can use this function in several ways to generate unique numbers to suit our requirements: NEWID generate alphanumeric value of 36 char. A Surrogate Key can be implemented by an auto-incremented key. SQL Server supports an IDENTITY column to perform the auto-increment feature. It allows a unique number to be generated when a new record is inserted into the database table.Syntax for Introducing Auto identity column with Create Table. SQL – PRIMARY KEY: PRIMARY KEY is a constraint in SQL which is used to identify each record uniquely in a table. By default, PRIMARY KEY is UNIQUE. PRIMARY KEY can’t have null values. A table can have only one PRIMARY KEY either on one column or multiple columns. When multiple columns are defined as PRIMARY KEY, then, it is called COMPOSITE KEY. For example, the following SQL query creates a new table called CUSTOMERS and adds five columns. Here, the AGE column is set to UNIQUE, so that you cannot have two records with the same age. CREATE TABLE CUSTOMERS( ID INT NOT NULL, NAME VARCHAR (20) NOT NULL, AGE INT NOT NULL UNIQUE, ADDRESS CHAR (25), SALARY DECIMAL (18, 2), PRIMARY KEY (ID) ).

Problem

As SQL Server DBAs we may need to generate a script for the creation of all Primary Keys, Unique and Foreign Key constraints. We know with the SQL Server native tools that there is not a way to meet this need all at the same time. In this tip we look at two simple scripts to generate the SQL Server Primary Keys, Unique and Foreign Key constraints and also provide two scripts for dropping these constraints.

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Solution

Common SQL Server constraints are for Primary and Foreign Keys as well as Unique constraints. They are very important for data integrity in SQL Server databases. This is why we need to be able to take a backup of each type of constraint in an efficient manner so that we can recreate them in case they are dropped by accident or if you need to recreate the same constraints in another copy of the same database for testing, development or training purposes. The scripts below have been written in SQL Server 2014 but they should also work on SQL Server 2005/2008/2008R/2012.

SQL Server Primary Key and Unique Constraint Creation Script

The following script is for the creation of all Primary Keys and Unique Constraints in the SQL Server database:

Script to Drop all SQL Server Primary Key and Unique Constraints

The following script is to drop all Primary Keys and Unique Constraints in the SQL Server database:

SQL Server Foreign Key Constraint Creation Script

The following script is for the creation of all Foreign Keys Constraints in the SQL Server database:

Script to Drop all SQL Server Foreign Key Constraints

The following script is to drop all Foreign Key Constraints in the SQL Server database:

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