Retrieving Individual Columns
What is SQL?
SQL is a programming language for user interaction with databases, used to query, update, and manage databases.
Database
A database is an organized structure designed to store, modify, and process large amounts of data.
Why SQL Matters
SQL is essential for managing and querying databases efficiently. It is widely used due to its standardization, scalability, and ability to ensure data integrity. SQL's integration with other technologies makes it a versatile tool in various applications, supporting real-time data processing and decision-making.
Let's get started! In this course, we will work with a country database containing a country table. You can see it under the code editor on the right bottom corner.
SQL Syntax Explanation
To retrieve data from a database, SQL uses the SELECT statement. Here's the basic syntax:
SELECT: specifies the columns to retrieve;
FROM: specifies the table from which to retrieve the data.
For example, to get the sample column from the sample_table table, the syntax is:
sql
The following query will return all entries in the continent column from the country table:
SELECT continent FROM country;
In our previous query, we utilized the SELECT to retrieve a single continent column from the country table.
It's important to note that you must specify the column name immediately after the SELECT keyword, and the FROM keyword specifies the name of the table from which we wish to retrieve data.
Swipe to start coding
Write an SQL query to retrieve a capital column from the country table.
Solution
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