Changing all zeros (if any) across all columns (in a table) to… say 1

Question

I have a table with 18 columns (all Ints) and 1040 rows. If any value is zero I want to change it to 1. I am using Postgresql. What is the best way to do this. I cannot come

Answer 1

How about this

UPDATE table SET columnA = 1 WHERE columnA = 0

But you will need a query for each column, or

UPDATE table SET columnA = 
CASE WHEN columnA = 0 THEN 1
ELSE columnA
END,

columnB = 
CASE WHEN columnB = 0 THEN 1
ELSE columnB
END, ...