Monday, 5 July 2021

SQL Snack: Create readonly DB user in Azure SQL DB

Case
I want to create a SQL Server user in my Azure SQL Database that can only read tables and view from a specific schema so I can use it for example to import data in to Power BI.
Azure SQL Database user
























Solution
Since Azure SQL DB has no gui for this task we have to write some (simple) T-SQL code. So login in your Azure SQL DB with your favorite SQL editor. For example  Azure Data Studio or the good old SQL Server Management Studio.

1) Create Login
First step is to create a Login with a password. This is done on the Master database.
-- Create Login on Master DB
CREATE LOGIN PowerBI
    WITH PASSWORD = 'B0bd4f211122cf9a03f64c81ba0f0d8f!';
Create Login on Master DB













2) Create User
The next step is to create the actual user connected to the Login from step 1. The username can differ from the Login name, but in most cases they will match. The next step must be executed on the DB where you want to give this user access.
-- Create user on DB
CREATE USER PowerBI
    FOR LOGIN PowerBI
Create user for Login on DB (not master)















However you can also execute it on the Master database as well (with the extra default). This will save you filling in the database name when you create the connection, which is very annoying especially within SSMS where you have to set it on the Connections Property tab.
-- Create user on Master DB (note the extra default schema)
CREATE USER PowerBI
    FOR LOGIN PowerBI
    WITH DEFAULT_SCHEMA=[dbo];
Create user for Login  on Master DB as well














Connect to specific DB
























3) Grant access to Schema
Last step is to grant SELECT access on a specific database schema. This is instead of using using fixed database roles such as db_datareader.
-- Allow only SELECT queries on the DB schema 'DWH'
GRANT SELECT ON SCHEMA :: DWH 
    TO PowerBI
    WITH GRANT OPTION;


















Conclusion
In this post you learned how to add a SQL Server user that can only execute select queries on tables and views in a specific database schema. Super handy when you created some views for your dataset in Power BI, but you don't want to show all tables and view in Power BI.

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