MySQL – Sub-query Example, Multiple sub-query, DB De-Normalization, Data Duplication, Data Redundancy Example of: Data Redundancy Data Duplication DB De-Normalization Multiple sub-query MySQL – Sub-query Example, Multiple sub-query, DB De-Normalization, Data Duplication, Data Redundancy This post is to show the power of single query which can complete the records by matching and comparing the reference […]