Article written by Sreenivas Mothukuru Most recently our team has received a user story from Product Owner (PO) where in we are asked to compare the records in excel sheet with the data in MySQL database to look for the matching records. At first glance the requirement sounds pretty simple and for a few minutes I was in an impression that the task can be done quickly. Now the million dollar question is "When the requirement is so simple ... what made PO delegate the task to our team?" This question encouraged me to revisit and review the user story requirements in detail. Then I understood that we need to compare each record from Excel sheet (i.e., ~1200 records) with the data in MySQL table (i.e., ~ 190,00,000 records ) to look for the matching records. In brief, this task demands enormous comparisons to get desired result. One of the solutions is to pick each record one by one from Excel sheet and query MySQL database. This way most of the comparison wil
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