How do I convert table column data from 'LastName, FirstName' to 'FirstName LastName' in Postgres

Question

How do I convert table column data from 'LastName, FirstName' to 'FirstName LastName' in Postgres.

So if the table column contains 'Ona, Lisa' I want it to return 'Lisa Ona'. If the column doesnt contain a ' ,' then I want it to return null. I've been trying to use postgres functions SUBSTRING and REGEXP_REPLACE but cannot get anything working.

Answer 1

You need strpos and substr functions and a CASE to return NULL .

SELECT CASE WHEN strpos(name,', ') > 0 
            THEN substr(name,strpos(name,', ') + 2)  ||' ' || substr(name,0, strpos(name,', '))
            ELSE NULL END
    FROM person

fiddle

Answer 2

Nevermind worked out a solution using SPLIT_PART function

SELECT 
t1.sort_name,
split_part(t1.sort_name, ', ', 2)|| ' ' || split_part(t1.sort_name, ', ', 1)  
FROM artist t1
WHERE 
t1.sort_name LIKE '%, %'

Answer 3

try this

select split_part(name,',',2) ||' '|| split_part(name,',',1) as "thename" from tblname     
where name LIKE '%,%'

String Functions and Operators and PostgreSQL SPLIT PART