How To Start Using Sql – If you’re new to learning SQL, you’ve probably played around with one of the following resources: codeacademy, datacamp, and khan academy. Each of these sites offers an interactive, hands-on approach to learning SQL for beginners.
But what happens next? How do you bridge the gap between “I know a little SQL” and “I’m good at asking questions and analyzing large data sets in SQL”?
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In this post, I’ll walk you through a series of simple steps you can follow to improve your skills at home, for free.
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Of course, there are options for learning SQL online without software. But there are some important things you need to do yourself:
There are many options to choose from, but MySQL is the most popular, so I’ll leave some notes on how to set it up below.
MySQL Workbench: This is the SQL editor or “GUI” you use to interact with the database. Download it from: MySQL Workbench.
The next step is to open the MySQL workspace, click on the local instance and enter the root password:
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To create a database, we simply enter the following command in the query window and execute it by clicking on the lightning symbol:
Next, we need to create our first table in our database. We open the query tab again, then use the “create table” command:
Now that we know how to create a table, it’s time to get some data for analysis. There are a few ways to do this.
This method is useful because it allows you to create reference tables. But it will be too manual to generate enough data for training.
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Another more scalable option is to search the web for a csv file that we can download and import into a table. For example, we can get free COVID19 data from kaggle.com.
Then right-click on “Tables” under the database you want to use and select “Table Import Wizard”:
This will take you to the screen where you can import the csv into a new table. Then we can click on the “Browse” button and find the file downloaded from the Internet. Finally, we name the table and confirm the data types:
The last way to import data is to search online for free SQL databases. For example, the MySQL Tutorial site has a free sample database here.
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All we need to do is download it, double-click it to open it in MySQL, and then run the script to create the database.
This is good because it gives us a database with lots of tables – a perfect opportunity to practice joining data.
You’ve come a long way. He downloaded SQL software, learned how to create databases and tables, and how to import data from various sources.
To be a good data analyst or data scientist, you need to be curious about your data. You need to ask the right questions and try to understand what is going on in your target area.
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Download data sets from different sources and practice combining them into new tables. Work with the newly created tables to answer difficult and interesting questions. Explore the most popular SQL techniques and see how they relate to the data you have. Google will answer if you get stuck.
In this post, we’ve gone through four steps to set up SQL and get ready to practice at home. The great thing about learning data analytics is that you can learn by doing. And action means: looking for data, formulating ideas, asking interesting questions and looking for meaningful insights.
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Open Run by pressing the Windows and R keys together. Since I am using SQL Server 2016, I typed sqlservermanager13.msc to open SQL Server Configuration Manager.
You can also open it by clicking the Start button and searching for SQL Server Configuration Manager as shown in the image below, and then clicking SQL Server Configuration Manager (version) to open it.
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After opening Configuration Manager, click SQL Server Services, which will display SQL Server services for all instances, as well as SQL Server Agent services.
Select the SQL Server service instance that you want to start in single-user mode. Right-click the service and click Properties as shown in the image below:
Go to the Startup parameters tab. Type -m and click Add as shown in the image below:
Click Apply, which adds the -m startup parameter to the list of startup parameters for this instance of SQL Server. Click OK in the warning window.
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Right-click the SQL Server service and click Restart to restart the SQL Server instance. SQL Server starts in single-user mode.
Now connect to SQL Server using SQL Server Management Studio or SQLCMD. You can find the failed link as shown in the image below. This is because the SQL Server Agent service is running and will only use available connections.
Be sure to stop the SQL Server Agent service for the SQL Server instance as SQL Server Agent and try to connect to SQL Server using SQLCMD or SQL Server Management Studio (SSMS).
We recommend that you use SQLCMD if you want to query SQL Server started in single-user mode as a direct connection and query using SQL Server Management Studio that uses more than one connection. To query SQL Server in single-user mode using SQL Server Management Studio, open SQL Server Management Studio and do not connect directly to SQL Server. Close the login window and click the New Query button as shown in the image below to open the query editor in SQL Server Management Studio:
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All users in the Local Administrator group can connect to SQL Server with sysadmin server-level role rights.
To start SQL Server in multiuser mode, remove the extra -m startup parameter from the SQL Server service properties and restart the SQL Server service.
The SQL Server user can also be started using the command line. Open the Start menu and search for services as shown in the image below. Click Services, which will open the Services window.
In the Services window, locate the SQL Server instance service that you want to start in single-user mode. Right-click the service and click Properties as shown in the image below:
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You can see the service name and display name in the Properties window. Now copy the name of the service that you will use on the command line to start an instance of SQL Server in single-user mode.
Open Run by pressing the Windows and R keys together. Type cmd and press enter which will open the command prompt.
Run the following command to stop the SQL Server service. In this case, MSSQLSERVER is the SQL Server service name. Replace it with your own:
If the services stopped successfully, start the SQL Server service by passing the m parameter. Open a command prompt and run the following command to start the SQL Server service in single-user mode. Look at the picture below:
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Open a command prompt and navigate to the folder where sqlservr.exe is located. Since I’m using the default case, the method is:
In this section, we looked at how to start SQL Server in single-user mode using SQL Server Configuration Manager by adding -m to the start parameter and using the command line. If you have any questions, feel free to ask them in the comment section below.
SQL Server DBA, Developer with experience in SQL Server administration, deployment, tuning, monitoring, high availability and disaster recovery technologies.
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