Hi Alfred,
I can see the issue from this ticket seems to be the same as on another ticket, where you also reported an SQL Query table has a filtering/search issue.
The solution should be the same for both, hopefully, so we will write the same instructions here.

Could you show me the SQL Query that was used for this table - and I can advise if maybe some small modification/correction is needed to get the search to work?

If the ticket won't allow you to write the Query code directly, please create a TXT file and try sending it as attachment, or wrap it inside a zipped file and send it that way.

You can also check these points to save time if you wish.

Our logic is based on a PHP SQL parser which has full support for the SQL dialect for the following statement types

SELECT, INSERT, UPDATE, DELETE, REPLACE, RENAME, SHOW, SET, DROP, CREATE INDEX, CREATE TABLE, EXPLAIN and DESCRIBE.

Some of them are disabled for security reasons.

Filtering, sorting, and search may not work properly if you include:

• Accent graves ( ` ) around the table name
• JOIN functions
• UNION functions
• CONCAT functions
• sub-queries

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So, first you can check for accent graves around the table name, if you have this, remove it...

Then, see if you used CONCAT to create any column.

If so, go into this column setting, and disable it from "global search" in the Filtering tab.

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If none of that helps,

you can try preparing a MySQL view (which will return the data that you need, call it e.g. “view1” and then build a wpDataTables based on a simple query like "SELECT * FROM view1″.

 If you need help with that, you can see our video, where we show an example of using View in our plugin.

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Let me know If that helped, and i can take a look at the Query, as well.

Thank you