Which of following types of table constraints will prevent the entry of duplicate rows:
Which of following types of table constraints will prevent the entry of duplicate rows:
مندرجہ ذیل میں سے کون سی قسم کی جدول کی رکاوٹیں ڈپلیکیٹ قطاروں کے اندراج کو روکیں گی:
Explanation
A unique constraint is a rule that forbids duplicate values in one or more columns within a table. Unique and primary keys are the supported unique constraints.