| 单词 | null value |
| 释义 | null valuenull valueA value in a field or variable that indicates nothing was ever derived and stored in it. For example, in a decimal-based amount field, a null value might be all binary 0s (null characters), but not a decimal 0. The decimal 0 would imply no dollars and cents, which could in fact be a valid derived value. See null and binary.See NVL |
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