Select from a Subquery : Select clause « Query Select

Select from a Subquery : Select clause « Query Select « Oracle PL/SQL Tutorial

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Oracle PL/SQL Tutorial » Query Select » Select clause

2.2.10.Select from a Subquery

SQL>

SQL>

SQL>

SQL> create table history

  2  ( empno      NUMBER(4)

  3  , beginyear  NUMBER(4)

  4  , begindate  DATE

  5  , enddate    DATE

  6  , deptno     NUMBER(2)

  7  , msal       NUMBER(6,2)

  8  , comments   VARCHAR2(60)

  9  ) ;



Table created.



SQL>

SQL>

SQL>

SQL> insert into history values (9,2000,date '2000-01-01',date '2002-01-02',40, 950,'history for 9');



1 row created.



SQL> insert into history values (8,2000,date '2000-01-02', NULL       ,20, 800,'');



1 row created.



SQL> insert into history values (7,1988,date '2000-01-06',date '2002-01-07',30,1000,'');



1 row created.



SQL> insert into history values (6,1989,date '2000-01-07',date '2002-01-12',30,1300,'');



1 row created.



SQL> insert into history values (5,1993,date '2000-01-12',date '2002-01-10',30,1500,'history for 5');



1 row created.



SQL> insert into history values (4,1995,date '2000-01-10',date '2002-01-11',30,1700,'');



1 row created.



SQL> insert into history values (3,1999,date '2000-01-11', NULL       ,30,1600,'');



1 row created.



SQL> insert into history values (2,1986,date '2000-01-10',date '2002-01-08',20,1000,'history for 2');



1 row created.



SQL> insert into history values (1,1987,date '2000-01-08',date '2002-01-01',30,1000,'history for 1');



1 row created.



SQL> insert into history values (7,1989,date '2000-01-01',date '2002-05-12',30,1150,'history for 7');



1 row created.



SQL>

SQL>

SQL>

SQL> select *

  2  from  (select empno, msal

  3         from   history

  4         order  by msal desc)

  5  where  rownum <= 3;



 EMPNO   MSAL

------ ------

     4   1700

     3   1600

     5   1500



3 rows selected.



SQL>

SQL> drop table history;



Table dropped.



SQL>

SQL>

2.2.Select clause
	2.2.1.	Performing Single Table SELECT Statements
	2.2.2.	Select employee first and last and sort by last name
	2.2.3.	List single column from a table
	2.2.4.	Use as to specify the alias name
	2.2.5.	Use function in select clause
	2.2.6.	Use more than one aggregate functions in a select statement
	2.2.7.	where clause
	2.2.8.	Compare with number
	2.2.9.	Concatenate string
	2.2.10.	Select from a Subquery
	2.2.11.	Select constant as a column
	2.2.12.	Negate a column value
	2.2.13.	Math calculation in select statement
	2.2.14.	Search for String Across Columns
	2.2.15.	Don't Perform the Same Calculation Over and Over
	2.2.16.	NO_INDEX function in select statement

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