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AND/OR - MySQL Conditions

In MySQL, the logical operators AND and OR are used to combine two or more conditions in a WHERE clause. These operators allow you to write complex queries that can filter data based on multiple conditions. In this tutorial, we'll learn how to use AND and OR in MySQL conditions.

Syntax

The basic syntax for using AND and OR in MySQL conditions is as follows:

SELECT column1, column2, ...
FROM table_name
WHERE condition1 AND/OR condition2;

Here, condition1 and condition2 are the two conditions that we want to combine using the AND or the OR operator.

Example

Let's say we have a table called "employees" with columns "id", "name", "age", and "salary". We can use the AND and OR operators to filter data based on multiple conditions:

SELECT id, name, age, salary
FROM employees
WHERE age > 30 AND salary > 50000;

This query will select all employees whose age is greater than 30 and whose salary is greater than 50000.

SELECT id, name, age, salary
FROM employees
WHERE age > 30 OR salary > 50000;

This query will select all employees whose age is greater than 30 or whose salary is greater than 50000.

Output

The output of these queries will be a list of all employees whose data matches the specified conditions.

Explanation

In the examples above, we used the AND and OR operators to combine two conditions in the WHERE clause of a MySQL query. The AND operator is used to select only rows that satisfy both conditions, while the OR operator is used to select rows that satisfy either of the conditions.

Use

Using AND and OR in MySQL conditions allows us to filter data based on multiple conditions, providing more powerful and flexible queries. This feature is especially useful when working with large datasets where we need to filter out specific records based on multiple criteria.

Important Points

  • Use parentheses () to group conditions when using both AND and OR in a query to ensure that the conditions are evaluated in the correct order.
  • The precedence of logical operators in MySQL is NOT, AND, OR.

Summary

In this tutorial, we learned how to use AND and OR in MySQL conditions to filter data based on multiple conditions. We discussed the syntax, example, output, explanation, use, and important points of using these operators in MySQL. With this knowledge, you can write more complex queries to filter data that matches specific criteria.

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