not null发音

意思翻译

非空

相似词语短语

null island───空岛

assert null───断言为空

null definition───空定义

null bot───空机器人

null byte───空字节

igneous null───火成岩零

token null───标记为空

drools null───无人机零点

aleph null───aleph空

双语使用场景

If not NULL, increment the line counter.───如果不是NULL，则增加行计数器。

NOT NULL - a NULL was found in field name.───NOT NULL——字段名中出现空值。

Restrictions and usage notes on DROP NOT NULL───DROP NOT NULL 的限制和使用说明

This routine initially checks if the passed inquiry context is not NULL and if it a context for group member.───它首先检查传递的查询上下文是否非NULL，以及是否是组成员的上下文。

Though you did not specify that column, the Rails migration created it for you anyway, with auto_increment and NOT NULL.───虽然没有指定这个列，但是Rails迁移会自动创建它，并具有auto_increment和NOTNULL属性。

The following table illustrates the relationship between the existence of a default and the definition of a column as NULL or NOT NULL.───下表说明默认值的存在与将列定义为NULL或NOTNULL之间的关系。

A computed column cannot be used as a DEFAULT or FOREIGN KEY constraint definition or with a NOT NULL constraint definition.───计算列不能用作DEFAULT或FOREIGNKEY约束定义，也不能与NOTNULL约束定义一起使用。

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NOTNULL列值的INSERT语句，此命令没有问题。

We recommend that you explicitly specify NULL or NOT NULL for each column in a temporary table.───建议对于临时表中的每列，显式指定NULL或NOTNULL。

英语使用场景

Unless you have a very specific reason to use a NULL value, you should always set your columns as NOT NULL.

If you assume that an argument is not NULL, for example, use an assertion statement to check for that assumption.

If the customer number is not null, that is, the customer is already known, the left hand path is followed (2), and the customer data is retrieved from the customer registration service (3).

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.

If defined as NOT NULL, the value corresponds to the start time associated with the most recent transaction (the value of the AS ROW BEGIN column).