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Introduction
SQL or Structured Query Language is a standard and universal language used to communicate with databases. Creation, deletion, fetching rows and modifying rows in a table are some of the tasks that can be done using SQL. One of the most basic and fundamental among these operations is creating a user. This task involves coding a series of structured commands to form a new user entity in a database, granting the user access and specifying roles.
Creating a User in SQL
In SQL, users are not created directly in the database, instead they are created in an instance of the SQL Server. The “CREATE USER” command is used to accomplish this. The basic structure for creating a user in SQL is
CREATE USER [user_name] FOR LOGIN [login_name] WITH DEFAULT_SCHEMA=[schema_name]
In this structure, [user_name] is the name of the new user, [login_name] refers to the SQL Server login which the new user is based on, and [schema_name] is the default schema that is assigned to the new user.
Understanding the code
- The “CREATE USER” command: This is used to create a new user. It’s followed by the user name, which is chosen by the developer.
- FOR LOGIN clause: This connects the new user to a login. If the login is not already present, SQL Server will create one.
- WITH DEFAULT_SCHEMA: This clause is optional, but if used, assigns the default schema or the logical container in which the new user’s database objects are stored. If not specified, SQL Server will use “dbo” as default schema.
Explanation of Steps in Implementation
Creating a user in SQL involves a series of steps, each revolving around an SQL command.
Step One: Log into SQL Server Management Studio using your SQL Server login credentials.
//login to SQL server management studio
Step Two: Open a new query window.
Step Three: Execute the CREATE USER command:
CREATE USER JohnDoe FOR LOGIN JohnLogin WITH DEFAULT_SCHEMA=[website_data];
Related Functions and Libraries
Apart from the CREATE USER command, other SQL commands related to user management include:
- ALTER USER: Used to modify a SQL Server user.
- DROP USER: Used to delete a user.
- GRANT: Used to give privileges to users.
In conclusion, creating a user in SQL requires understanding the structure of the “CREATE USER” SQL command. Implementing such involves executing this command in the SQL Server Management Studio. Similar commands include ALTER USER, DROP USER, and GRANT, which respectively are used for modifying, deleting and assigning privileges to users.
