uncleflo
Registered since September 28th, 2017
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How to avoid many-to-one problems in SQL
Saved by uncleflo on May 15th, 2017.
It’s been a while since I’ve posted an abstract, theoretical article on a fine point of SQL. Today I want to bring your attention to two ways in which an RDBMS can allow you to do something that has no well-defined result. These involve queries where several values are eligible, but only one is chosen – and chosen in an undefined manner. I’ll show you the two blunders, tell you when they might occur, and explain how to avoid them.
sql blog article problem query database description relation involve eligible many-to-one one-to-many explanation mysql
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