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sql-linux-quickstart-connect-query.md

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sql-linux-quickstart-connect-query.md

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author VanMSFT
ms.author vanto
ms.reviewer randolphwest
ms.date 05/20/2022
ms.prod sql
ms.technology linux

Connect locally

The following steps use sqlcmd to locally connect to your new SQL Server instance.

  1. Run sqlcmd with parameters for your SQL Server name (-S), the user name (-U), and the password (-P). In this tutorial, you are connecting locally, so the server name is localhost. The user name is sa and the password is the one you provided for the SA account during setup.

    sqlcmd -S localhost -U sa -P '<YourPassword>'

    You can omit the password on the command line to be prompted to enter it.

    If you later decide to connect remotely, specify the machine name or IP address for the -S parameter, and make sure port 1433 is open on your firewall.

  2. If successful, you should get to a sqlcmd command prompt: 1>.

  3. If you get a connection failure, first attempt to diagnose the problem from the error message. Then review the connection troubleshooting recommendations.

Create and query data

The following sections walk you through using sqlcmd to create a new database, add data, and run a simple query.

For more information about writing Transact-SQL statements and queries, see Tutorial: Writing Transact-SQL Statements.

Create a new database

The following steps create a new database named TestDB.

  1. From the sqlcmd command prompt, paste the following Transact-SQL command to create a test database:

    CREATE DATABASE TestDB;

  2. On the next line, write a query to return the name of all of the databases on your server:

    SELECT Name from sys.databases;

  3. The previous two commands were not executed immediately. You must type GO on a new line to execute the previous commands:

    GO

Insert data

Next create a new table, dbo.Inventory, and insert two new rows.

  1. From the sqlcmd command prompt, switch context to the new TestDB database:

    USE TestDB;

  2. Create new table named dbo.Inventory:

    CREATE TABLE dbo.Inventory (
   id INT, name NVARCHAR(50),
   quantity INT
);

  3. Insert data into the new table:

    INSERT INTO dbo.Inventory VALUES (1, 'banana', 150);
INSERT INTO dbo.Inventory VALUES (2, 'orange', 154);

  4. Type GO to execute the previous commands:

    GO

Select data

Now, run a query to return data from the dbo.Inventory table.

  1. From the sqlcmd command prompt, enter a query that returns rows from the dbo.Inventory table where the quantity is greater than 152:

    SELECT * FROM dbo.Inventory
WHERE quantity > 152;

  2. Execute the command:

    GO

Exit the sqlcmd command prompt

To end your sqlcmd session, type QUIT:

QUIT

Performance best practices

After installing SQL Server on Linux, review the best practices for configuring Linux and SQL Server to improve performance for production scenarios. For more information, see Performance best practices and configuration guidelines for SQL Server on Linux.

Cross-platform data tools

In addition to sqlcmd, you can use the following cross-platform tools to manage SQL Server:

Tool Description
Azure Data Studio A cross-platform GUI database management utility.
Visual Studio Code A cross-platform GUI code editor that run Transact-SQL statements with the mssql extension.
PowerShell Core A cross-platform automation and configuration tool based on cmdlets.
mssql-cli A cross-platform command-line interface for running Transact-SQL commands.

Connecting from Windows

SQL Server tools on Windows connect to SQL Server instances on Linux in the same way they would connect to any remote SQL Server instance.

If you have a Windows machine that can connect to your Linux machine, try the same steps in this topic from a Windows command-prompt running sqlcmd. You must use the target Linux machine name or IP address rather than localhost, and make sure that TCP port 1433 is open on the SQL Server machine. If you have any problems connecting from Windows, see connection troubleshooting recommendations.

For other tools that run on Windows but connect to SQL Server on Linux, see:

Other deployment scenarios

For other installation scenarios, see the following resources:

  • Upgrade: Learn how to upgrade an existing installation of SQL Server on Linux
  • Uninstall: Uninstall SQL Server on Linux
  • Unattended install: Learn how to script the installation without prompts
  • Offline install: Learn how to manually download the packages for offline installation

For answers to frequently asked questions, see the SQL Server on Linux FAQ.

Next steps