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Use Subqueries in the FROM Clause in Oracle
How To Use Subqueries in the FROM Clause in Oracle?
✍: FYIcenter.com
If you have a query returning many rows of data, and you want to perform another query on those rows, you can put the first query as a subquery in the FROM clause of the second query. The following statement shows you how to use a subquery as base table for the main query:
SQL> SELECT * FROM ( 2 SELECT first_name, last_name, department_name 3 FROM employees e, departments d 4 WHERE e.department_id = d.department_id 5 ) WHERE department_name LIKE 'S%' ORDER BY last_name; FIRST_NAME LAST_NAME DEPARTMENT_NAME ----------------- ---------------------- --------------- Ellen Abel Sales Sundar Ande Sales Mozhe Atkinson Shipping Amit Banda Sales Elizabeth Bates Sales Sarah Bell Shipping ......
⇒ Counting Groups Returned with the GROUP BY Clause in Oracle
⇐ Use Subqueries with the EXISTS Operator in Oracle
2019-09-27, 1510🔥, 0💬
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