Question

in my table the structure is like that

TableA

first_column        second_column       third_column
wwwew                   frfrffee          rfffrfr
dddfdd                  fffrfrfr          rfddwdrv
etc

if users has not set the value of second_column i want to display the result of first_column but if users has specified the value of second_column i want to display the second_column value.

i tried where clause with ‘and’ & ‘or’ statement but it is not working.

second_column is child of first column so if users has set parent only then the output will be based on parent but if users has set parent as well as child or only child the output will be based on child input

Answer 1

I think you can accomplish what you’re trying to do using the coalesce() function.

select coalesce(second_column, first_column) from TableA;