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What is a SQL database?
What is SQL & how does it work?
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How many basic SQL query examples are there?
Nov 17, 2022 · In this article, we’ll start by explaining what a database is and showing some examples. We’ll move on to how databases can be used to efficiently work with large amounts of structured data. Then we’ll show you some examples of different types of SQL databases and when to use them.
- Selecting All Columns From One Table. This query is useful when you want to quickly get all the columns from a table without writing every column in the SELECT statement.
- Selecting One Column From One Table. You can use this query when you only need one column from the table.. Query. SELECT first_name FROM employees; Explanation.
- Selecting Two Columns From One Table. This query is useful when selecting two (or more) columns from one table. Query. SELECT first_name, last_name FROM employees;
- Selecting Two (or More) Columns From One Table and Filtering Using Numeric Comparison in WHERE. Knowing this SQL query will allow you to filter data according to numeric values.
SQL stands for Structured Query Language. SQL lets you access and manipulate databases. SQL became a standard of the American National Standards Institute (ANSI) in 1986, and of the International Organization for Standardization (ISO) in 1987.
Jul 8, 2020 · SQL databases have been used for decades — and they're still in use today. In this blog, we give a basic overview of what a SQL database is and compare a few of the most commonly used ones: MariaDB, MySQL, and PostgreSQL (sometimes referred to as Postgres).
What is SQL – give you a brief overview of the SQL language and its popular dialects. SQL Syntax – provide you with the syntax of the SQL language. SQL Sample Database – introduce you to an HR sample database.
Get certified by completing the SQL course. Well organized and easy to understand Web building tutorials with lots of examples of how to use HTML, CSS, JavaScript, SQL, Python, PHP, Bootstrap, Java, XML and more.
Dec 7, 2020 · A database is a structured set of data held in a computer, especially one that is accessible in various ways. It is essentially an organized set of data on a computer, which can be accessed electronically from a computer system.
