How to Fix \'Column Count Mismatch\' Error When Transferring Data Between MySQL Tables?

How to Transfer Data from One Table to Another in MySQL

When faced with the task of transferring data from one table to another, the INSERT statement can come in handy. In your specific case, you encountered an error with your query:

INSERT INTO mt_magazine_subscription ( 
      magazine_subscription_id, 
      subscription_name, 
      magazine_id, 
      status ) 
  VALUES ( 
      (SELECT magazine_subscription_id, 
              subscription_name, 
              magazine_id 
       FROM tbl_magazine_subscription 
       ORDER BY magazine_subscription_id ASC), '1')

The error message indicates that the number of columns in the INSERT statement doesn't match the number of values provided. The issue here is that you're attempting to insert the results of a subquery as a single value, which is not possible.

The Solution: INSERT...SELECT Syntax

To address this, you should use the INSERT...SELECT syntax, which allows you to directly insert data from one table into another. Here's the corrected query:

INSERT INTO mt_magazine_subscription ( 
      magazine_subscription_id, 
      subscription_name, 
      magazine_id, 
      status ) 
SELECT magazine_subscription_id, 
       subscription_name, 
       magazine_id, 
       '1'
FROM tbl_magazine_subscription
ORDER BY magazine_subscription_id ASC

In this revised query:

• The subquery is used to select the appropriate data from tbl_magazine_subscription.
• The '1' value for the status column is directly quoted within the SELECT clause.
• The columns in the INSERT statement and the SELECT clause now match, resolving the column count mismatch issue.

With this correction, your query should successfully insert the data from tbl_magazine_subscription into mt_magazine_subscription with the specified status value.

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