1/*Two tables: CUSTOMERS table and ORDERS table.
2ORDERS table contains STATUS attribute.*/
3SELECT
4 customers.customerNumber,
5 customerName,
6 orderNumber,
7 status
8FROM
9 customers
10LEFT JOIN orders ON
11 orders.customerNumber = customers.customerNumber;
1-- LEFT OUTER JOIN is equivalent to LEFT JOIN
2-- b.VALUE1 is null when ID not in table2 (idem for c.VALUE1 in table3)
3SELECT a.ID, a.NAME, b.VALUE1, c.VALUE1 FROM table1 a
4 LEFT OUTER JOIN table2 b ON a.ID = b.ID
5 LEFT OUTER JOIN table3 c ON a.ID = c.ID
6WHERE a.ID >= 1000;
7
8-- ⇓ Test it ⇓ (Fiddle source link)