2019-12-27 · 123. 1st Normal Form Rule 1 Each column should contain atomic values. Entries like X,Y and W,X violate this rule. 2020 By Eng. Joud Khattab. 124. 1st Normal Form Rule 2 A column should contain values that are of the same type. Do not inter-mix different types of values in any column. 2020 By Eng. Joud Khattab.