Database - Read For Learn

dbDelta() doesn’t properly parse or compare foreign key constraints — it’s built to detect differences in columns, indexes, and primary keys, but it doesn’t have full logic to recognise existing CONSTRAINT … FOREIGN KEY clauses. The result is that on the second activation it sees your CONSTRAINT line as “missing” and tries to run something … Read more

How can I temporarily set sql_mode=only_full_group_by in $wpdb query?

Problem while importing a site in WPLocal: SQL files fail to import

Recursion using year loop in sql

Database not loading after transfer via phpmyadmin

In order for WP to pick up on the custom table prefix you need to set it in wp-config.php. Locate this section: /** * WordPress database table prefix. * * You can have multiple installations in one database if you give each * a unique prefix. Only numbers, letters, and underscores please! */ $table_prefix = … Read more

How to sync non-wp database with wp-database?

As Tom J Nowell pointed out in the comments, this is a very specific situation, which makes the question rather difficult to answer. If the source system has suitable code for pushing data to other systems, then you could consider registering a custom REST endpoint at the WordPress end. The endpoint would receive, validate and … Read more

I need to downgrade from 5.9.9 to latest 5.8.x – where is the db instructions executed when upgrading?

“First time for me trying to downgrade a WP” That would be one time too much… I am actually not familiar with any software that you can downgrade (for many tools, the version is just misleadingly give the impression there is some incremental continuation while the truth is that it is a totally different product, … Read more

Error of ‘P404 Migration skipped. Already completed.’ on error_log file

Same problem here.I may have identified the cause of the error. Are you using the “All 404 Redirect to Homepage” plugin ?

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Fix: WordPress.DB.PreparedSQL.NotPrepared Plugin Check (PCP)

Custom DB tables, being neat and tidy on delete

DB table creation on reactivation – dbDelta errors on CONSTRAINTS