Lucas stared at the nested queries. The logic was a double negative: Find employees for whom there does not exist a department 5 project that they have not worked on.
"The map?" Lucas had asked, confused.
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The file opened. Lucas expected a list of answers: Question 3.12: Answer is schema A. That was what the standard manual offered. But this... this was different. Lucas stared at the nested queries
Professor Halloway lowered her chalk. She looked at Lucas, then at the board. "Precisely. The distinction is subtle but vital for data integrity." standard notation for Entity-Relationship diagrams