Relational operators are used for comparing numbers and strings. If a string is compared to a number, MySQL will try to convert the string to a number. If a TIMESTAMP column is compared to a string or a number, MySQL will attempt to convert the string or number to a timestamp value. If it's unsuccessful at converting the other value to a timestamp, it will convert the TIMESTAMP column's value to a string or a number.
Re: Relational Operators
Relational operators are used for comparing numbers and strings. If a string is compared to a number, MySQL will try to convert the string to a number. If a TIMESTAMP column is compared to a string or a number, MySQL will attempt to convert the string or number to a timestamp value. If it's unsuccessful at converting the other value to a timestamp, it will convert the TIMESTAMP column's value to a string or a number.