below is my requirement

i need to push second_name values to first_name column only when first_name columns are null.

for example,

i want drake and jim to be moved to first_name column and should not be present in second_name column.Rest of the names should be same as it is.

CodePudding user response：

Looks like

update your_table set
  first_name  = second_name,
  second_name = null
where first_name is null;