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1.21.Not
1.21.1.use the NOT operator to negate a condition.
1.21.2.A search condition that uses the NOT operator
1.21.3.The same condition rephrased to eliminate the NOT operator
1.21.4.The condition 'column IS NOT NULL' is equivalent to the condition 'NOT (column IS NULL)'
1.21.5.The use of the LIKE operator (together with NOT).
1.21.6.NOT BETWEEN