Question

I want to replace always the last node in the string-

root/node1/node2

If I pass node3 as the parameter it should do a replace like this –

 root/node1/node3

Can anyone help me do this say the column name was lineage and I have the id. So, the query would be –

Update
   tree
set
  lineage= -- replace(lineage,node3)  -- this is what i need  ?
where
  id=2

Answer 1

You could do some string manipulation to find the last occurrence of a /, and then strip everything after that point… and then append your new node parameter to that value

Update
   tree
set
  lineage = LEFT(Lineage, LEN(Lineage) - CHARINDEX('/', REVERSE(Lineage)) + 1) + @NewNode
where
  id=2