How to use or in mysql

OR operator is used in MySQL to join conditions, if any condition is true, then the expression is true. The syntax is <condition1> || <condition2>, where the condition can be a Boolean expression. You can use the OR operator to query records that meet multiple conditions. It has a lower priority than the AND operator. If necessary, use parentheses.

OR operator in MySQL

1. Overview

The OR operator (||) is used in MySQL to logically connect two or more conditions. The result is as follows:

• If any one condition is true, the entire expression is true.
• If all conditions are false, the entire expression is false.

2. Syntax

The syntax of the OR operator is as follows:

<code><condition1> || <condition2></code>

where<condition1> and <condition2> is a Boolean expression.

3. Usage Examples

The following are some examples of using the OR operator:

• Query with "John" or "Jane" Name records:

<code class="sql">SELECT * FROM users WHERE name = "John" OR name = "Jane";</code>

• Query records with product price greater than 100 US dollars or inventory greater than 50 pieces:

<code class="sql">SELECT * FROM products WHERE price > 100 OR quantity > 50;</code>

• Query records with "administrator" " or "Editor" role user:

<code class="sql">SELECT * FROM users WHERE role = "Admin" OR role = "Editor";</code>

4. Other notes

• OR operator has a higher priority than AND operator Low, so parentheses should be used to enforce order of operations when needed.
• If both conditions are NULL, the result of the OR operator is NULL.
• The OR operator can also be used to join multiple subqueries.

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