Semidifference via except and join - sql, PL-SQL Programming

Semidifference via EXCEPT and JOIN - SQL




WHERE Name = 'Devinder'


SELECT StudentId


WHERE CourseId = 'C1') AS T1


The NOT IN expression above appears to be testing for the appearance of a character string in a table, but in fact the first operand in this context is short for ROW(StudentId)

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