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Editorial Team
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Asked: 2026-06-18T00:13:26+00:00

I have a table users that has an auto-incrementing id column. For every new

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I have a table users that has an auto-incrementing id column. For every new user, I essentially need to insert three rows into three different tables, which are 1. user, 2. user_content, and 3. user_preferences. The rows inserted into user_content and user_preferences are referenced by their id‘s which correspond to each user’s id (held in user)

How do I accomplish this?

Should I do the INSERT INTO user query first, obtaining that auto-incremented id with last_insert_id(), and then the other two INSERT INTO queries using the obtained user id? Or, is there a more concise way to do this?

(note: I am using MySQL and PHP, and if it makes a difference, I am using a bigint to store the id values in all three tables.)

Thank you!

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1 Answer

  1. Editorial Team

    The approach that you’ve described (insert into user first, take the result of last_insert_id(), and use that to insert to the other two tables) is perfectly reasonable; I see nothing wrong with it.

    It might be technically possible to combine the three queries and use the LAST_INSERT_ID() MySQL function to insert values to the other two tables, but this would be significantly more complex without any corresponding benefits. Not really worth doing, in other words.

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