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How do I create a complete organisation's database, where I can access tables and perform custom SQL requests. I can use PHP and mySQL, I am actually working on a WordPress theme. And I am trying to do something like this:

+----------+     +------------+     +------------+
| Book     |     | Borrow     |     | Reader     |
|----------|     |------------|     |------------|
|codeBook# |_____|codeBook#   |     |codeReader# |
|title     |     |codeReader# |_____|name        |
|datepub   |     |date        |     |age         |
+----------+     +------------+     |contacts    |
                                    +------------+

Some explanation and link will be great

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You can do that accessing the phpmyadmin dashboard of your host, but that is no the right way to do it, i recommend you to research and learn about:

| improve this answer | |
  • Thanks @David for the hints, I have posted an answer, because it was too big for a comment – Ninda Feb 21 '17 at 15:24
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I found a solution:

  • I have already created custom post type for different needs(eg. Book and Reader).
  • I will manually create the remaining tables(eg. Borrow) in phpMyAdmin
  • Then use comment $wpdb->get_results( 'SELECT....'); for custom query
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  • It's better to use built-in functionality. In this case, set up Borrow as a custom taxonomy. Then you're not adding non-WP tables and running custom queries. – WebElaine Feb 21 '17 at 20:24

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