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。

youdao

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INTEGER NOT NULL)。

youdao

For example, if a before trigger supplies value to a NOT NULL column, then the before trigger is executed first and a value is supplied to the column so that the NOT NULL constraint isn't violated.

例如，如果一个BEFORE触发器给一个NOT null列提供值，那么先执行BEFORE触发器，给列提供值，所以不会违反NOT NULL约束。

youdao

For example, if a before trigger supplies value to a NOT NULL column, then the before trigger is executed first and a value is supplied to the column so that the NOT NULL constraint isn't violated.

例如，如果一个BEFORE触发器给一个NOT null列提供值，那么先执行BEFORE触发器，给列提供值，所以不会违反NOT NULL约束。

youdao