How To Use Subqueries in the FROM clause
Q
How To Use Subqueries in the FROM clause? - Oracle DBA FAQ - Understanding SQL SELECT Query Statements
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A
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 ......
2007-04-19, 4933👍, 0💬
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