For table, use the CHECK constraint to ensure integrity.
对于表，可以使用CHECK约束来确保完整性。
The CHECK constraint is perfect for this, as the following table definition shows.
CHECK约束非常适合执行此项操作，如以下所示表定义。
In that case, the primary table should be populated first to maintain the referential constraint.
在这种情况下，应该首先填充主表，以保持引用约束。
A constraint limits either a column or a table in some manner.
约束通过某种方式对列或表进行限制。
The target table stock is altered and a constraint is added to the unit_price.
对表stock进行修改，向unit _ price增加了一个约束。
The unique constraint is created in the database when you save the table.
当保存表时，将在数据库中创建该唯一约束。
Can't remove unique constraint since it's the primary key of a table.
唯一约束是表的主键，因此不能移除。
Can't remove unique constraint since it's the primary key of a table.
唯一约束是表的主键，因此不能移除。
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