Postgresql: Get all tables count from DB

 SELECT schemaname,relname,n_live_tup 

  FROM pg_stat_user_tables 

  ORDER BY n_live_tup DESC;

Postgresql: Get all primary keys from all the tables in DB

SELECT 

kcu.table_schema, kcu.table_name, tco.constraint_name, kcu.ordinal_position AS position, kcu.column_name AS key_column

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_name = tco.constraint_name

WHERE tco.constraint_type = 'PRIMARY KEY'

ORDER BY 

kcu.table_schema, kcu.table_name, position;

Columns

table_schema - PK schema name

table_name - PK table name

constraint_name - PK constraint name

position - index of column in table (1, 2, ...). 2 or higher means key is composite (contains more than one column)

key_column - PK column name

Postgresql: Find the 'N' th occurrences in a string

 Sample Table:

create table filter_table (filter_type varchar(500));

Insert Query:

insert into filter_table (filter_type) values ('1111111 > 22222 > 3333333> 4444444> 123456789 > abcdefghi > 987654321 > zyxwvuts > 0000000 >');

Query to find the occurrences:

select substring(filter_type from '^(([^ ]* ){2})')

from filter_table