show above dimmension in current row

[omid5ive]

hi

i have a table like below:

class	teacher
1	a
2	b
3	c
4	d

i want to create table like below:

class	teacher
1	null
2	a
3	b
4	c

how can i do this?

[Anil_Babu_Samineni]

May be this

[Anonymous]

above(teacher,1) use this expression

[omid5ive]

are you set it in expression

?
i need to use this field in dim

[Anil_Babu_Samineni]

May be use - Previous(teacher)