约束 keep within bounds; restrain; bind; bound; boundage;tie; restraint; restriction; engagement; repress; constraint 约束自己 restrain oneself; 约束自己的感情 restrain one's feelings; 自我约束 self-discipline; self-control; 不受传统观念的约束 bound by no traditional idea; 打破[摆脱]一切约束 throw [shake; break] all restraint; 在法律和道德的约束下 be bound by legal and moral ties; 他受到自己诺言的严格约束。 he was bound hand and foot by his promise.; 约束力 force of constraint
Entity integrity enforces the integrity of the identifier columns or the primary key of a table , through unique indexes , unique constraints or primary key constraints 实体完整性通过unique索引、 unique约束或primary key约束,强制表的标识符列或主键的完整性。