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SQL Users

By Ravi KhatriRavi Khatri

SQL Users

Introduction to SQL Users

In SQL Server a database user can be created either by using Transact-SQL or using SQL Server Management Studio (SSMS). Different types of users can be created in SQL but before understanding the types of users let us first understand the user creation flow. Following is the flow for login to the creation of the user and assigning permission.

Typical SQL Users workflow

Below is the workflow of SQL User:

1. Creating Login

Step 1: First, we need to create a login for a user and to do that navigate to Security -> Login

SQL Users1

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Step 2: Next, we enter the login name and select SQL server authentication with password

SQL Users2

Step 3: This creates the login

SQL Users3

The same result can be achieved using the following T-SQL command:

CREATE LOGIN MyLogin WITH PASSWORD = 'abc';

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2. Creating User

Step 1: To create a user first go the database folder in the object explorer and identify the database for which you have to create the user. In the security folder, there is an option to create a user.

identify the database

Step 2: Then you will get the following screen in which set the user name and select the login which we have just created as we are creating user of type SQL user with login.

SQL Users5

Step 3: The same result can be achieved using the following T-SQL query. To view, the query clicks the script button on create database user window and it will open in a query window.

SQL Users6

USE [AdventureWorks2017] GO
CREATE USER [test1] FOR LOGIN [MyLogin] GO

We can see that the user is created and if not visible then refresh the Users folder.

3. Assigning permissions to User

Step 1: Go to the properties of the user test1 using right-click and select the Securables option on the left and click on Search.

Securables option

Step 2: Then we select all objects belonging to the schema and the schema which we select is dbo. We have selected dbo(database owner) since it has permissions to perform all activities of the database.

database owner

Step 3: Now select a table and in explicit permissions, we give Grant to select.

explicit permissions

Same can be achieved using the following T-SQL query

use [AdventureWorks2017] GO
GRANT SELECTON [dbo].[sysdiagrams] TO [test1] GO

The permissions will be granted to the user and now we have seen the general workflow of a user. Now we will get into the specifics and look at different types of users.

Types of Users

There are 3 main types of users

  • Mapped users are users which are created based on a SQL Server Login
  • Unmapped users are users which are created without a SQL Server Login
  • Contained users are users that are created without a SQL Server Login, but both the username and password are stored within the database.

Now let’s create the users

SQL User with login

We have seen this type in user creation flow

SQL User without login

1. CREATE USER (Transact-SQL)

SQL Users11

In this type of user, we do not provide any login information and just give the user name and can select the default schema.

Same can be achieved using the following T-SQL query

USE [AdventureWorks2017] GO
CREATE USER [test2] WITHOUT LOGIN
GO

Explanation: Login based users are created if the person who is making a connection cannot authenticate with windows who are generally persons outside of the organization e.g.  Customer who is connecting to your server. For people inside your organization, the windows authentication is a better choice as they will not have to remember an additional password and it also offers a feature of Kerberos.

2. Contained user

A contained user is not associated with login in the master database. This makes the database portable and this is a good choice if you want to move the database between the instances of SQL Server. To create this type of user the admin must enable the use of the contained database for SQL Server and the database should be first enabled for containment.

To enable containment, go to server properties and set Enable Contained Databases to True.

Contained user

Next, select the properties of your selected database go-to options section and set containment type to partial

database go-to

Now let us create a new user using SQL user with password and we have the option to add default language and select default schema.

SQL Users14

Same can be achieved using the following T-SQL query

USE [AdventureWorks2017] GO
CREATE USER [test3] WITH PASSWORD = N'Password1', DEFAULT_SCHEMA = [dbo] GO

General options while adding user

Depending on the user type selected the options may change and some options have a default value so it can be left blank.

Username –You can enter the user name or you can select the Windows user from the type list by clicking the ellipsis (…) and choose from the dialog of Select User

Login name – Enter the login for the user or select from the dialog by clicking the ellipsis (…) and choose from the dialog of Select Login. It is available if Windows useror SQL user with login is selected.

Password and Confirm password –They are used for contained databases where you have to enter a password for the user to authenticate.

Default language – Select the default language for the user.

Default schema – This schema will own objects created by useror select from the dialog by clicking ellipsis (…) and choose from the dialog of Select Schema. For the User type, it is available for Windows user, SQL user with login and SQL user without login

Certificate name – Here you can enter the certificate to be used for the user or select from the dialog by clicking the ellipsis (…) and choose from the dialog of Select Certificate. For the User type, it is available for User mapped to a certificate

Asymmetric key name–We can enter the key to be used for user or select from the dialog by clicking the ellipsis (…) and choose from the dialog of Select Asymmetric key. For the User type, it is available for User mapped to an asymmetric key

Conclusion

So, in this article we have looked at the user creation workflow in SQL server database along with that we have also seen at the types of user which we can create in SQL server management studio as well in T-SQL queries.

Recommended Articles

This is a guide to SQL Users. Here we discuss an introduction to SQL Users, step by step workflow, different types explained in detailed. You can also go through our other related articles to learn more –

  1. MySQL Administration
  2. PostgreSQL Tablespaces
  3. PostgreSQL cluster
  4. SQL Bulk Insert
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