What are the rules for using “and” and “or” in MySQL?

In MySQL, AND and OR are logical operators used to connect multiple conditions.

1. AND operator: The AND operator is used to combine multiple conditions, requiring all conditions to be true in order to return true. If any of the conditions are false, the entire expression will return false.

For example:
Retrieve all rows from the table where condition1 and condition2 are met.

1. OR Operator: The OR operator is used to combine multiple conditions, and the whole expression will return true as long as at least one condition is true. The whole expression will only return false when all conditions are false.

For example: Retrieve all data from the table where either condition1 or condition2 is met.

When combining multiple conditions using the AND and OR operators, you can use parentheses to specify the order of operations, for example:
SELECT * FROM table_name WHERE (condition1 AND condition2) OR condition3;

Summary: AND requires all conditions to be true, while OR only requires one condition to be true.