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oracle sql select from multiple tables

By VasteMondeVasteMonde on Apr 22, 2021
-- With JOIN
-- No row if id does not exist in t2
SELECT t1.name, t2.salary FROM t1 JOIN t2 on t1.id = t2.id;
-- A row with a NULL salary is returned if id does not exist in t2
SELECT t1.name, t2.salary FROM t1 LEFT OUTER JOIN t2 on t1.id = t2.id;

-- With UNION: distinct values
SELECT emp_name AS name from employees
SELECT cust_name AS name from customers;

-- With UNION ALL: keeps duplicates (faster)
SELECT emp_name AS name from employees
SELECT cust_name AS name from customers;

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