Posted In: null value

SQL NULL Value – Simplified

In SQL, NULL approximately represents an unknown value.An arithmetic operation involving a NULL returns NULL. For example, NULL minus NULL yields NULL, not zero and NULL plus NULL is NULL as well.A boolean comparison between two values involving a NULL returns neither true nor false, but unknown in SQL's three-valued

This Article is TAGGED in 3 Valued Logic, 3VL, NULL, null value, SQL NULL, Truth Table, Understanding Nulls. Read more