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Question
In SQL, this does not necessarily indicate that there is no value for a particular data field.
Answer
what is null?

Question
In SQL, this does not necessarily indicate that there is no value for a particular data field.
Answer
?

Question
In SQL, this does not necessarily indicate that there is no value for a particular data field.
Answer
what is null?
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pdf

owner: aelizzybeth - (no access) - Assignment_4_Working_With_Data.pdf, p6

Summary

statusnot learnedmeasured difficulty37% [default]last interval [days]               
repetition number in this series0memorised on               scheduled repetition               
scheduled repetition interval               last repetition or drill

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