When you start with T-SQL probably you will get this error: The server principal "your-user" is not able to access the database "testDB" under the current security context.
That's how I solved this fail and that is just a question of the steps to follow to install t-sql in your machine.
What the sources that I used:
<ul>
<li>install mssql using the terminal: <a href="https://computingforgeeks.com/how-to-install-ms-sql-on-ubuntu/" class="autolinkedURL autolinkedURL-url" target="_blank">computingforgeeks.com/how-to-install-ms-sql..</a></li>
<li>changed the port to be able to access by dbeaver-ce: <a href="https://docs.microsoft.com/en-us/sql/linux/sql-server-linux-configure-mssql-conf?view=sql-server-ver15" class="autolinkedURL autolinkedURL-url" target="_blank">docs.microsoft.com/en-us/sql/linux/sql-serv..</a></li>
<li>create user and give admin access: <a href="https://tableplus.com/blog/2018/10/how-to-create-user-with-admin-access-in-sql-server.html" class="autolinkedURL autolinkedURL-url" target="_blank">tableplus.com/blog/2018/10/how-to-create-us..</a></li>
</ul>
<pre><code>$ sqlcmd -S localhost,5500 -U SA
1&gt; ALTER SERVER ROLE sysadmin ADD MEMBER username;
2&gt; GO
1&gt; exit
$ sqlcmd -S localhost,5500 -U username
1&gt; CREATE DATABASE testDB;
2&gt; GO
1&gt; SELECT name FROM sys.databases;
2&gt; GO
</code></pre><ul>
<li>download dbeaver community: <a href="https://dbeaver.io/download/" class="autolinkedURL autolinkedURL-url" target="_blank">dbeaver.io/download</a></li>
<li>install dbeaver: <a href="https://askubuntu.com/questions/788197/graphical-ms-sql-clients-for-a-ubuntu-desktop" class="autolinkedURL autolinkedURL-url" target="_blank">askubuntu.com/questions/788197/graphical-ms..</a></li>
</ul>
If you follow this steps, now you can create database, import csv file and so on.

When you start with T-SQL probably you will get this error: The server principal "your-user" is not able to access the database "testDB" under the current security context.

That's how I solved this fail and that is just a question of the steps to follow to install t-sql in your machine.

What the sources that I used:
- install mssql using the terminal: https://computingforgeeks.com/how-to-install-ms-sql-on-ubuntu/
- changed the port to be able to access by dbeaver-ce: https://docs.microsoft.com/en-us/sql/linux/sql-server-linux-configure-mssql-conf?view=sql-server-ver15
- create user and give admin access: https://tableplus.com/blog/2018/10/how-to-create-user-with-admin-access-in-sql-server.html


```
$ sqlcmd -S localhost,5500 -U SA
1> ALTER SERVER ROLE sysadmin ADD MEMBER username;
2> GO
1> exit
$ sqlcmd -S localhost,5500 -U username
1> CREATE DATABASE testDB;
2> GO
1> SELECT name FROM sys.databases;
2> GO

``` 

- download dbeaver community: https://dbeaver.io/download/
- install dbeaver: https://askubuntu.com/questions/788197/graphical-ms-sql-clients-for-a-ubuntu-desktop

If you follow this steps, now you can create database, import csv file and so on.


Solving the error: is not able to access the database of SQL Server

SQL Server (T-SQL) - handle the fail to access the database (Ubuntu users)