Why does this SQL update lose rows?

Why does this SQL update lose rows in a batch job. The SQL code updates a table using a join without a stable key, so duplicate matches overwrite the wrong rows. In SQL pipelines this silently corrupts data.

#whatswrongwiththissqlquery #sqlbug #sqlproductionbug #sqldebugging #sqldatabase #sqlcodereview #sqlperformance #sqlreliability #sqlanalytics #sqldataintegrity #sqlengineering #sqlupdatebug #sqljoin #sqldat...

https://www.youtube.com/watch?v=3qc8B1Hs3s4

How to Master SQL Joins | HackerNoon

Various SQL join types with clear explanations and practical examples

https://hackernoon.com/how-to-master-sql-joins-inner-outer-cross-and-self-joins-with-examples?source=rss

#SQL #Databases #SQLjoin

I should point out that #MUSK is probably doing essentially a #SQLJOIN operation between federal data and Twitter's other web crawling.

#EvilPlan #MakingAList
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