Mega Code Archive

Use COUNT to count the rows from a subquery with set operator

SQL> -- SQL> SQL> create table customer( 2 cust_no integer primary key 3 ,lastname varchar2(20) not null 4 ,firstname varchar2(15) not null 5 ,midinit varchar2(1) 6 ,street varchar2(30) 7 ,city varchar2(20) 8 ,state varchar2(2) 9 ,zip varchar2(5) 10 ,zip_4 varchar2(4) 11 ,area_code varchar2(3) 12 ,phone varchar2(8) 13 ,company_name varchar2(50) 14 ); Table created. SQL> SQL> insert into customer(cust_no,lastname,firstname,midinit,street,city,state,zip,zip_4,area_code,phone,company_name) 2 values(1, 'Allen', 'Joe','J','10 Ave','London','CA','11111','1111','111', '111-1111','Big Company'); 1 row created. SQL> insert into customer(cust_no,lastname,firstname,midinit,street,city,state,zip,zip_4,area_code,phone,company_name) 2 values(2,'Ward','Sue','W','20 Ave','New York','NY','44444','4444','444', '436-4444','B Company'); 1 row created. SQL> insert into customer(cust_no,lastname,firstname,midinit,street,city,state,zip,zip_4,area_code,phone,company_name) 2 values(3,'Jason','Pure','J','50 St','Longli','CA','55555','5555','555', '234-4444','C Company'); 1 row created. SQL> insert into customer(cust_no,lastname,firstname,midinit,street,city,state,zip,zip_4,area_code,phone,company_name) 2 values(4,'Bird','Jill', null,'30 St','Pais','NY','22222','2222','222', '634-7733','D Company'); 1 row created. SQL> insert into customer(cust_no,lastname,firstname,midinit,street,city,state,zip,zip_4,area_code,phone,company_name) 2 values(5,'Hill','Carl','H','19 Drive','A Town','CA','66666','6566','666', '243-4243','E Company'); 1 row created. SQL> insert into customer(cust_no,lastname,firstname,midinit,street,city,state,zip,zip_4,area_code,phone,company_name) 2 values(6,'Peter','Yari','P','38 Ave','Small City','NY','77777','7777','777', '454-5443','F Inc'); 1 row created. SQL> insert into customer(cust_no,lastname,firstname,midinit,street,city,state,zip,zip_4,area_code,phone,company_name) 2 values(7,'Joe','Paula','J','78 St. Apt 3A','Queen City','NY','32322','2323','888', '664-4333','E Inc'); 1 row created. SQL> insert into customer(cust_no,lastname,firstname,midinit,street,city,state,zip,zip_4,area_code,phone,company_name) 2 values(8,'Chili','Steve','C','38 Ave Apt 62','Mili','CA','88888','8888','787', '456-4566','G Inc'); 1 row created. SQL> insert into customer(cust_no,lastname,firstname,midinit,street,city,state,zip,zip_4,area_code,phone,company_name) 2 values(9,'Mona','Joe','M','930 Ave933','Kansas City','MO','12345','1234','412', '456-4563','H Inc'); 1 row created. SQL> insert into customer(cust_no,lastname,firstname,midinit,street,city,state,zip,zip_4,area_code,phone,company_name) 2 values(10,'Hack','Kisi','H','Kings Rd','Bellmore','NY','54321','3898','516', '767-5677','I Inc'); 1 row created. SQL> insert into customer(cust_no,lastname,firstname,midinit,street,city,state,zip,zip_4,area_code,phone,company_name) 2 values(11,'Bill','Jose','B','12 Giant Rd.','Newton','NJ','23454','1234','958', '123-7367','J Associates'); 1 row created. SQL> insert into customer(cust_no,lastname,firstname,midinit,street,city,state,zip,zip_4,area_code,phone,company_name) 2 values(12,'Taker','Lawrence','T','1 Sask Rd.','Camp','NJ','19191','3298','928', '123-7384','K Company'); 1 row created. SQL> insert into customer(cust_no,lastname,firstname,midinit,street,city,state,zip,zip_4,area_code,phone,company_name) 2 values(13,'Richer','Doris','R','213 Easy Street','WarPease','RI','34343','2112','501', '123-7384','L Inc'); 1 row created. SQL> insert into customer( cust_no,lastname,firstname,midinit,street,city,state,zip,zip_4,area_code,phone,company_name) 2 values(14,'Pete','Doris','P','9 Ave','New York','NY','45454','4222','112', '123-1234','M Company'); 1 row created. SQL> SQL> create table cust_history( 2 cust_no integer primary key 3 ,lastname varchar2(20) not null 4 ,firstname varchar2(15) not null 5 ,midinit varchar2(1) 6 ,street varchar2(30) 7 ,city varchar2(20) 8 ,state varchar2(2) 9 ,zip varchar2(5) 10 ,zip_4 varchar2(4) 11 ,area_code varchar2(3) 12 ,phone varchar2(8) 13 ,company_name varchar2(50) 14 ); Table created. SQL> insert into cust_history(cust_no,lastname,firstname,midinit,street,city,state,zip,zip_4,area_code,phone) 2 values(3,'Brad','Ted','T','13 Street','Newton','RI','22222','3333','401', '123-4321'); 1 row created. SQL> insert into cust_history( cust_no,lastname,firstname,midinit,street,city,state,zip,zip_4,area_code,phone) 2 values(4,'Wite','Doris','R','94 Ave','New York','NY','22299','3222','212', '123-1234'); 1 row created. SQL> SQL> SQL> SQL> select count(*) 2 from (select cust_no, lastname 3 from customer 4 minus 5 select cust_no, lastname 6 from cust_history ); COUNT(*) ---------- 14 1 row selected. SQL> SQL> drop table customer; Table dropped. SQL> drop table cust_history; Table dropped. SQL> SQL> --