Hi Everyone,
I was trying to collect table metadata with a description; the use case is that I need to show all columns of the tables whether it has the description or not.
I tried the below query, but it only gives column details that have a description and ignore others if not.
create table test(id int);
create table test1(id int Primary key );
comment on column test.id is 'Test descr';
SELECT c.table_schema,c.table_name,c.column_name,
case
when c.domain_name is not null then c.domain_name
when c.data_type='character varying' THEN 'character varying('||c.character_maximum_length||')'
when c.data_type='character' THEN 'character('||c.character_maximum_length||')'
when c.data_type='numeric' THEN 'numeric('||c.numeric_precision||','||c.numeric_scale||')'
else c.data_type
end as data_type,
c.is_nullable,
(select 'Y' from information_schema.table_constraints tco
join information_schema.key_column_usage kcu
on kcu.constraint_name = tco.constraint_name
and kcu.constraint_schema = tco.constraint_schema
and kcu.constraint_schema = c.table_schema
and kcu.table_name = c.table_name
and kcu.column_name = c.column_name
where tco.constraint_type = 'PRIMARY KEY' ) as is_in_PK,
(select distinct 'Y' from information_schema.table_constraints tco
join information_schema.key_column_usage kcu
on kcu.constraint_name = tco.constraint_name
and kcu.constraint_schema = tco.constraint_schema
and kcu.constraint_schema = c.table_schema
and kcu.table_name = c.table_name
and kcu.column_name = c.column_name
where tco.constraint_type = 'FOREIGN KEY' ) as is_in_FK,
pgd.description
FROM pg_catalog.pg_statio_all_tables as st
Left outer join pg_catalog.pg_description pgd on (pgd.objoid=st.relid)
left outer join information_schema.columns c on (pgd.objsubid=c.ordinal_position
and c.table_schema=st.schemaname and c.table_name=st.relname)
where c.table_name='test'
order by c.table_schema,c.table_name,c.ordinal_position;
expected formate is :
| table_schema | table_name | column_name | data_type | is_nullable | is_in_pk | is_in_fk | description |
|---|
any suggestions?
Thanks,
Rj
