如何在PostgreSQL中使用CASE语句替换文本数组中的空白行？

Question

I have 12 unique IDs in my PostgreSQL 9.5 table for which some array (text) are blanks:

ID(int)     my_array(text)
1           1,112,298
2
3           2,114,235,145,126,123,141
..          .. 

I am trying to replace these blank rows with '0' in my query but so far failed to do so:

Select
      Case when my_tbl.my_array = ' '
      then '0'
      else my_array
      end as array
from my_table

The query runs but no result. Can somebody help to me to replace blanks rows using case statement or otherwise?

Answer 1

Use coalesce() :

select id, coalesce(my_array, '0') as my_array
from my_table;