Comments - PHP query is not working.
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Try to keep using consistent case with column names so use the mixed case for CatalogNumber. Check the php error log to see if something occurred in the query being in error rather than the result set.
Your multiple side database with multiple columns for MatrixCode looks odd as this is normally done in multiple tables with JOINs. Relook at the structure if the SQL you are writing is seeming abnormally complex.
Thank You I did solve the issue and changed all the case to lower, which just helps in being organized. Thank You Again!