Last month I alerted you to the failure by data professionals to appreciate the importance, for soundness reasons, of reliance on the DBMS rather than application code for data manipulation and integrity enforcement.
Relational design, databases, and DBMSs are the analyst's friends and, given the state of the database field, she/he would be well advised to be as familiar with them as she/he is with analytics and programming, to appreciate unobvious risks to correctness.
Read it all (and please comment there, not here)
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