Why is the Page ID not sequential?

[Martin Min]

Hi, I have followed this tutorial to created the database and populated the tables.  I am wondering why the page id is not sequential. The following are the first 20 page ids from the database:

MariaDB [Wikipedia]> select Page.id,Page.pageId from Page limit 0,20;

+-----+--------+

| id  | pageId |

+-----+--------+

|  12 |     12 |

|  25 |     25 |

|  39 |     39 |

| 290 |    290 |

| 303 |    303 |

| 305 |    305 |

| 307 |    307 |

| 308 |    308 |

| 309 |    309 |

| 316 |    316 |

| 324 |    324 |

| 330 |    330 |

| 332 |    332 |

| 334 |    334 |

| 336 |    336 |

| 339 |    339 |

| 340 |    340 |

| 344 |    344 |

| 358 |    358 |

| 359 |    359 |

+-----+--------+

Also, is the "id" field redundant here? 

[Alberto Barron Cedeno]

Hi Martin,

as far as I know, the ids are the unique identifiers from the Wikipedia edition itself. If article associated to id 13 was removed or is not accessible for some reason, you will not have it. 

Best regards,

Alberto

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[Martin Min]

Thank you, Alberto. Just want to get a confirmation on this.

Martin