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Last Updated: October 18, 2026
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Within database management, NULL signifies an absent or undetermined Null values are unknowns. Not blank, not zero, but unknown. This In this video, I talk about how NULLs behave in the WHERE clause in Why does 'contact_id = 8 OR contact_id ≠ 8' drop a row? On the I hope this helps you in your 70-761 journey. I am using the database TSQLV4. TSQLV4 and all scripts can be downloaded from ... Relational databases connect columns from different tables using joins, which query engines execute through Predict exactly when NOT IN returns nothing. On a real PostgreSQL 16 database the same NOT IN query works for Mouse buyers ... How can a single number crash a stock exchange? When the data type is wrong. This episode explains why data types are the ...
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