片语

not is null不为空

serviceNO char NOT NULL舱位等级编号

Not-Null Constraints非空约束

NOT NULL VIOLATION违反非空

Comment can not be null评论主体不存在

Must Not Be Null不能为空

login parameter not be null登录参数不能为空

NOT NULL NULL NOT NULL可否为空

英汉例句

• the not null attribute of column credit_line in table account has to be dropped because some other account types have been added that do not have a credit line.

  account表中的 credit_line列的not null属性必须删除，这是因为添加了没有信用行的其他账号类型。

• the combined record is much easier to use—you only have to check the picture field to see if it's not null (which was the result of the left outer join).

  而组合的记录使用起来要容易得多 —只需检查picture字段，查看它是否为空（这是leftouterjoin的结果）。

• we added the not null flag to indicate that the fields must not be null.

  我们添加了not null标志来指示字段必须不能为空。

• application of data to targets: replication requires columns of like attributes (for example, integer not null from the source table to integer not null at the nickname).

  到目标的数据应用：复制需要像属性一样的列（例如，从源表的integernot null到别名上的integernot null）。

• this new validation will enforce not null column constraints by rejecting null values, but only in situations where your database would reject a null value.

  这种校验会通过拒绝空值，强迫加上非空[not null]字段的约束，但是也只有在这种情况下，你的数据库会拒绝空值。

• constraints supports, primary, foreign, unique, not null constraint.

  约束 支持主键、外键、惟一和非空约束。

• i have also added the constraint that the password should be not null and the password should be between 6 and 10 characters long.

  我还加入了限制条件，密码不能为空，长度在6至10 个字符之间。

• supports, primary, foreign, unique, not null and check constraints.

  支持主键、外键、惟一、非空和检查约束。

• in lines 22 through 34 you select an operating system that is not null from the list obtained in previous step.

  从第 22行到第 34行从上一步中获得的数组中选择一个不为空的操作系统。

• partition compatibility is not affected by columns with not null or for bit data definitions.

  分区兼容性不受带有not null或forbitdata定义的列的影响。

• sql uses a small integer which contains a zero if the column is not null or -1 if the column contains nulls.

  如果列不包含空值，则sql使用一个包含一个0 的小整数；反之则包含-1。

• for primary and unique keys, only the not null columns are listed and can be selected to define these keys.

  对于主键和外键，只有非空列才能被列出和选择来定义这些键。

• one of the problems with not entering this data in regular rdbms columns is that no rules are defined—no data types, not null identifiers and so forth.

  未在常规的rdbms列中输入该数据导致的问题之一是没有定义任何规则 ——没有数据类型和not null标识符等。

• initially, this routine checks if the passed inquiry context is not null and is for a group member inquiry.

  这个例程首先检查传递的查询上下文是否非null，以及是否是用于组成员查询的上下文。

• a workaround to this is to supply a default value to the not null column whose value comes from a before insert trigger, so that the constraint is not violated.

  一种解决方法是给从beforeinsert触发器取得值的not null列提供默认值，这样就不会违反约束。

• in mysql, if you try to execute an insert statement that does not provide a value for a not null column, the command is successful.

  在mysql 中，如果要执行一个不提供not null列值的insert语句，此命令没有问题。