MariaDB Select

MariaDB is a popular open-source relational database management system. One of the most commonly used commands in MariaDB is the SELECT statement, which is used to retrieve data from one or more tables in a database.

Syntax

The basic syntax for the SELECT statement in MariaDB is as follows:

SELECT column1, column2, ...
FROM table_name;

This will select all columns from the specified table. If you only want to select specific columns, you can list them after the SELECT keyword.

SELECT column1, column2
FROM table_name;

You can also use the * to select all columns from the table:

SELECT *
FROM table_name;

Filtering Data

The WHERE keyword is used in the SELECT statement to filter data based on specified conditions. For example, to select all rows from the "users" table where the "age" column is greater than 30:

SELECT *
FROM users
WHERE age > 30;

You can use various comparison operators in the WHERE clause, including:

• = (equals)
• != (not equals)
• < (less than)

• (greater than)

• <= (less than or equal to)

• = (greater than or equal to)

You can also use logical operators (AND, OR, and NOT) to combine conditions:

SELECT *
FROM users
WHERE age > 30 AND gender = 'Female';

Sorting Data

The ORDER BY keyword is used to sort the results of a SELECT statement. For example, to select all rows from the "users" table and sort them by the "age" column in ascending order:

SELECT *
FROM users
ORDER BY age ASC;

You can also sort in descending order by using the DESC keyword:

SELECT *
FROM users
ORDER BY age DESC;

You can specify multiple columns to sort by, separating them with commas:

SELECT *
FROM users
ORDER BY age DESC, last_name ASC;

Conclusion

The SELECT statement is a fundamental tool for working with data in MariaDB. It allows you to retrieve specific data from one or more tables and filter and sort that data according to your needs. With a good understanding of SELECT syntax and functionality, you can effectively manipulate data within your MariaDB database.