Teaching BPSC 4.0 बिहार उच्च माध्यमिक शिक्षक भर्ती (PGT) Mock Test DBMS

Suppose for a given database, one attribute in a row is not provided with a value by the user. What value represents this unknown field?

1
0
2
NULL
3
Garbage Data
4
More than one of the above
5
None of the above
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