Mysql boolean settings

Mysql's boolean setting does not have the boolean Type in MySQL. This is also a strange phenomenon. For example, create table xs (id int primary key, bl boolean) can be created successfully, but you can check the statements after the table is created, mysql replaces it with tinyint (1 ). That is to say, mysql has boolean = tinyInt. When a boolean type is saved in MYSQL, 1 indicates TRUE, 0 indicates FALSE, and BOOLEAN indicates tinyint (1) in MySQL. MySQL has four constants: true, false, TRUE, FALSE. They represent 1, 0, and 1, 0, respectively.