please, i need help.

in my DB i've this situation:

column1|column2|column3|column4|column5|column6
ABC|22222222|null|33333333|33333333|44444444
DEF|11111111|77777777|11111111|null|77777777
GHI|88888888|null|null|99999999|00000000

and in need to transform in:

column1|column2|column3|column4|column5|column6
ABC|22222222|33333333|44444444|null|null
DEF|11111111|77777777|null|null|null
GHI|88888888|99999999|00000000|null

tk a lot.
Mau5000

Create a copy of the table, then write a series of UPDATE statements.
Such as :=
UPDATE mytable SET col3 = col4,col4 = 6 ,assuming that is the correct pattern

As long as there is a pattern , then this should work.=
Ensure you've backedup prior to starting

When you can write the contents of Column3, Column4, ... column6 in Column2, that means they all contain the same kind of data.

Your database should be normalised:
column1|column2|column3|column4|column5|column6
should be normalised into:
column1|column2

ABC|22222222|null|33333333|33333333|44444444
Will become:
ABC|22222222
ABC|33333333
ABC|33333333
ABC|44444444

GHI|88888888|null|null|99999999|00000000
Will become
GHI|88888888
GHI|99999999
GHI|00000000