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I noticed in chapter 4 that the author includes a value of NULL when inserting a record into a database table in which the field corresponding to the NULL value is defined as a primary key whose value is not NULL.


$query = "INSERT INTO employees VALUES (NULL, $did, '$fn', '$ln', '$e', $ext)";

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Right. That's pretty much standard. When you provide a NULL value for a column defined as NOT NULL, MySQL will use the default value instead. For the auto incremented primary key, the default value will be the next logical integer value. Again, this is standard procedure.

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