To append all rows from one table to another

Question

I'm using PostgreSQL 9.3. Suppose I have two sql-queries which return two tables with completely the same column names. For instance:

(SELECT id, partner_registration_date
FROM partner) as tbl1

and

(SELECT id, partner_registration_date
FROM partner_statistic) as tbl2

I need to return a table tbl such that tbl_ROW_SET = tbl1_ROW_SET ∪ tbl2_ROW_SET and tbl_COLUMN_SET = tbl1_COLUMN_SET = tbl2_COLUMN_SET

Answer 1

For first case you can simply try:-

SELECT id, partner_registration_date
FROM partner as tbl1
UNION ALL
SELECT id, partner_registration_date
FROM partner_statistic as tbl2;

And for second you can try with:-

SELECT DISTINCT id, partner_registration_date
FROM (SELECT id, partner_registration_date 
      FROM partner as tbl1
      UNION ALL
      SELECT id, partner_registration_date
      FROM partner_statistic as tbl2);

Hopefully this helps you.