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Asked: 2026-05-31T21:01:54+00:00

The first column in a MySQL table of mine is the primary key with

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The first column in a MySQL table of mine is the primary key with auto increment. I am trying to add a new row with PHP like this.

mysql_query("INSERT INTO users VALUES ('', '$username', '$hashedPassword')");

What should I put in '' or the first field? It is auto generated, but I don’t want the field to be empty.

Interestingly, making the field empty works, but I am afraid if this breaks in certain circumstances I have not encountered. What is the standard entity to put there?

Also, does your solution also apply to timestamp fields that default to the current time?

I am new to PHP and MySQL. Thanks.

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1 Answer

  1. Editorial Team

    It’s good to get into the habit of specifying your fields like this

    INSERT INTO users (username,password) VALUES ( '$username', '$hashedPassword')

    Or if you want to specify the id field too use NULL

    INSERT INTO users (id,username,password) VALUES (NULL, '$username', '$hashedPassword')

    By specifying the fields, your code is less likely to break if, for example, you add an extra field to the table.

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