[sql-server-2008] Restrict SQL Server Login access to only one database

I have a SQL Server server which has around 50 databases on it.

I wish to create a new Login for a client who wishes to have access to their database.

But I don't want to give them access to the other 49 databases.

How can I do this?

For anyone else out there wondering how to do this, I have the following solution for SQL Server 2008 R2 and later:

USE master
go
DENY VIEW ANY DATABASE TO [user]
go

This will address exactly the requirement outlined above..

I think this is what we like to do very much.

--Step 1: (create a new user)
create LOGIN hello WITH PASSWORD='foo', CHECK_POLICY = OFF;


-- Step 2:(deny view to any database)
USE master;
GO
DENY VIEW ANY DATABASE TO hello; 


 -- step 3 (then authorized the user for that specific database , you have to use the  master by doing use master as below)
USE master;
GO
ALTER AUTHORIZATION ON DATABASE::yourDB TO hello;
GO

If you already created a user and assigned to that database before by doing

USE [yourDB] 
CREATE USER hello FOR LOGIN hello WITH DEFAULT_SCHEMA=[dbo] 
GO

then kindly delete it by doing below and follow the steps

   USE yourDB;
   GO
   DROP USER newlogin;
   GO

For more information please follow the links:

Hiding databases for a login on Microsoft Sql Server 2008R2 and above

this is to topup to what was selected as the correct answer. It has one missing step that when not done, the user will still be able to access the rest of the database. First, do as @DineshDB suggested

  1. Connect to your SQL server instance using management studio
   2. Goto Security -> Logins -> (RIGHT CLICK) New Login
   3. fill in user details
   4. Under User Mapping, select the databases you want the user to be able to access and configure

the missing step is below:

5. Under user mapping, ensure that "sysadmin" is NOT CHECKED and select "db_owner" as the role for the new user.

And thats it.