Your SQL query can be 100% valid and still return the wrong result. Let me show you the NOT IN trap
0:24
YouTubeSmart Data AI
Your SQL query can be 100% valid and still return the wrong result. Let me show you the NOT IN trap
Your SQL query can be syntactically correct and still return the wrong result. In this video, I show a classic SQL mistake: using NOT IN when NULL values exist. Two queries. Same goal. One returns zero rows. The other returns the correct result. This happens because of SQL’s three-valued logic and is a common interview trap and real-world ...
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