### I have an idea! ```SQL CREATE TABLE Customers ( Age INT DEFAULT 18 CHECK(Age >0 AND Age < 100), ) ``` Or ```SQL CREATE TABLE Customers ( Age INT DEFAULT 18, CHECK((Age >0 AND Age<100) AND (Email !='') AND (Phone !='')) ); ``` [See](https://dev.mysql.com/doc/refman/8.0/en/create-table-check-constraints.html)
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