1·The number of NULLs in the column.
列中null值的个数。
2·The CWF fields must be padded with SPACES (not NULLS).
CWF字段必须带空格(而不是NULL)。
3·The value for the first key is 4 bytes long and it is entirely NULLs.
第一个键的值为 4 字节且其完全为 NULL。
4·Nulls are not matched to any value, including other instances of null.
空值不与任何值匹配，包括其他实例的空值。
5·Likewise, if the NULLS last option is used, the last partition must end with MAXVALUE.
同样，如果使用NULLS LAST选项，最后一个分区必须结束于MAXVALUE。
6·RPG uses a 1 character field (like an indicator) to determine if a column contains nulls.
RPG 使用一个 1 字符字段（比如一个指示符）来确定列是否包含空值。
7·That code would have created a new trail with a Trail object with nulls for all attributes.
这个代码应当创建一条新路线，该路线有一个所有属性都为 null 的 Trail 对象。
8·The general requirement for these algorithms is that the container does not contain any nulls.
这些算法的通用要求是，容器不能包含任意空值。
9·For this report run only nulls are being suppressed on both the row and column edge of the crosstab.
对于该报表运行，仅在交叉表的行和列边缘上抑制了nulls。
10·SQL/XML is good if you want results returned as sets and missing XML elements represented with nulls.
如果您希望将结果作为集合返回，且将丢失的 XML 元素表示为空，那么 SQL/XML 有优势。