Our bike-sharing database contains a second table, stations. The stations table contains information about every station in the Hubway network and includes an id column that is referenced by the trips table. The first line is a SELECT clause to tell the database we want to see the bike_number column and a count of every row. It also uses AS to tell the database to display each column with a more useful name.

In the next dialog box that appears, simply add the name of your test database, like in the image below where I named my database as “MyTestDB”. This is a compilation of training tutorial video files gathered from various sources. After taking this training, I feel that Intellipaat is a good scope of learning.

FreeCodeCamp’s SQL Course

You can again use execute_query() to delete records from YOUR SQLite database. All you have to do is pass the connection object and the string query for the record you want to delete to execute_query(). Then, execute_query() will create a cursor object using the connection and pass the string query to cursor.execute(), which will delete the records.

• It helps to think of the query plan like the engine for a chess game on a computer.
• To learn more I recommend reading “Registering SQL Server instances for easier management” from mssqltips.com.
• A table can be joined to itself using self join, when you want to create a result set that joins records in a table with other records in the same table.
• Performance Monitor, or Perfmon, measures performance statistics on a regular interval, and saves those stats in a file.

When we talk about a SQL database, it will be a relational database. We start off by giving the keywords ALTER TABLE, then we will give in the name of the table. If you have worked with other languages, then you would know about the concept of Functions.

What are the different modes of training that Intellipaat provides?

In this tutorial we’ll be working with a dataset from the bike-sharing service Hubway, which includes data on over 1.5 million trips made with the service. This statement is used to create a full backup of an existing database. This statement is used to change the datatype of an existing column in a table. You can use the ALTER TABLE statement with ADD/DROP Column command according to your need. If you wish to add a column, then you will use the ADD command, and if you wish to delete a column, then you will use the DROP COLUMN command.

This post isn’t going to go through the ins-and-outs of installing or using SSMS. Note that, beginning with SSMS 18.7, Azure Data Studio is included in the install.

How to fetch alternate records from a table?

Super Key –The set of attributes which can uniquely identify a tuple is known as Super Key. So, a candidate key, primary key, and a unique key is a superkey, but vice-versa isn’t true. This type of back up only backs up the parts of the database, which have changed since the last complete backup of the database. This statement what is sql dba is used to drop an existing table or a database. As the name suggests, this statement is used to create a database. Data Manipulation Language – Consists of commands which are used to manipulate the data present in the database. Data Definition Language – Consists of commands which are used to define the database.

• I’ve taken the liberty of singling tempdb out from the result set since you do not back up that system database.
• The first of these is the physical operator followed by the logical operation .
• Now that you know the data definition commands, let me take you through the various types of Keys and Constraints that you need to understand before learning how to manipulate the databases.
• It also defines integrity constraints to enforce business rules on the data when it is entered into an application or a database.
• Another often overlooked part of testing is the usual myriad of connected services and applications.

High Availability is the solution\process\technology to make the application\database available 24×7 under either planned or un-planned outages. If you are creating a new database with the RESTORE command you may use the MOVE option like the following command. Restoring is the process of taking a backup file and turning it back into an operational database. Again click OK to create the ‘TestUser’ user as viewable in the Object Explorer. Connect to SQL Server instance and right-click on the databases folder. Click on new database and the ‘New Database’ screen will appear.