Title: Database merge question
Last modified: August 18, 2016

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# Database merge question

 *  Resolved [sepp](https://wordpress.org/support/users/sepp/)
 * (@sepp)
 * [20 years, 7 months ago](https://wordpress.org/support/topic/database-merge-question/)
 * Hi
    I’m trying to merge two databases: a) WP1.3-alpha-2, updated to 1.5.2 DB 
   b) old Pivot entries, imported into 1.5.2 DB
 * luckily, my post ID’s do not overlap, the same goes to categories, and since 
   pivot didn’t have any linkmanager or postmeta, they don’t need to be merged…
 * but i have some questions about other ID’s:
 * wp_post2cat.rel_id
    wp_comments.comment_ID
 * are they used in any manner exept for being an ID.
    if i change them, will i 
   break something? if not, how can i reset them a la “give each row a new unique
   ID, start from number 1234” (let’s say, i have wp_comments.comment_ID’s 1-1233
   in the first db)
 * TIA
 * sepp

The topic ‘Database merge question’ is closed to new replies.

## Tags

 * [database](https://wordpress.org/support/topic-tag/database/)
 * [upgrade](https://wordpress.org/support/topic-tag/upgrade/)

 * In: [Installing WordPress](https://wordpress.org/support/forum/installation/)
 * 0 replies
 * 1 participant
 * Last reply from: [sepp](https://wordpress.org/support/users/sepp/)
 * Last activity: [20 years, 7 months ago](https://wordpress.org/support/topic/database-merge-question/)
 * Status: resolved

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