PostgreSQL row-to-column, column-to-row string functions

Liezi:

 

1. Row to column

select regexp_split_to_table(permit_type,',') as code from food_perfect_factor a where a.permit_number = 'SC20152272518392'

2. Column to row

select string_agg(a.code,',') from (select regexp_split_to_table(permit_type,',') as code from food_perfect_factor a where a.permit_number = 'SC20152272518392') a