Mega Code Archive

If city equals New York, the string You are in New York is returned, otherwise the string Not is returned

SQL> SQL> -- create demo table SQL> create table Employee( 2 ID VARCHAR2(4 BYTE) NOT NULL, 3 First_Name VARCHAR2(10 BYTE), 4 Last_Name VARCHAR2(10 BYTE), 5 Start_Date DATE, 6 End_Date DATE, 7 Salary Number(8,2), 8 City VARCHAR2(10 BYTE), 9 Description VARCHAR2(15 BYTE) 10 ) 11 / Table created. SQL> SQL> -- prepare data SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date, End_Date, Salary, City, Description) 2 values ('01','Jason', 'Martin', to_date('19960725','YYYYMMDD'), to_date('20060725','YYYYMMDD'), 1234.56, 'Toronto', 'Programmer') 3 / 1 row created. SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date, End_Date, Salary, City, Description) 2 values('02','Alison', 'Mathews', to_date('19760321','YYYYMMDD'), to_date('19860221','YYYYMMDD'), 6661.78, 'Vancouver','Tester') 3 / 1 row created. SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date, End_Date, Salary, City, Description) 2 values('03','James', 'Smith', to_date('19781212','YYYYMMDD'), to_date('19900315','YYYYMMDD'), 6544.78, 'Vancouver','Tester') 3 / 1 row created. SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date, End_Date, Salary, City, Description) 2 values('04','Celia', 'Rice', to_date('19821024','YYYYMMDD'), to_date('19990421','YYYYMMDD'), 2344.78, 'Vancouver','Manager') 3 / 1 row created. SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date, End_Date, Salary, City, Description) 2 values('05','Robert', 'Black', to_date('19840115','YYYYMMDD'), to_date('19980808','YYYYMMDD'), 2334.78, 'Vancouver','Tester') 3 / 1 row created. SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date, End_Date, Salary, City, Description) 2 values('06','Linda', 'Green', to_date('19870730','YYYYMMDD'), to_date('19960104','YYYYMMDD'), 4322.78,'New York', 'Tester') 3 / 1 row created. SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date, End_Date, Salary, City, Description) 2 values('07','David', 'Larry', to_date('19901231','YYYYMMDD'), to_date('19980212','YYYYMMDD'), 7897.78,'New York', 'Manager') 3 / 1 row created. SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date, End_Date, Salary, City, Description) 2 values('08','James', 'Cat', to_date('19960917','YYYYMMDD'), to_date('20020415','YYYYMMDD'), 1232.78,'Vancouver', 'Tester') 3 / 1 row created. SQL> SQL> SQL> SQL> -- display data in the table SQL> select * from Employee 2 / ID FIRST_NAME LAST_NAME START_DATE END_DATE SALARY CITY DESCRIPTION ---- ---------- ---------- ----------- ----------- ---------- ---------- --------------- 01 Jason Martin 1996-JUL-25 2006-JUL-25 1234.56 Toronto Programmer 02 Alison Mathews 1976-MAR-21 1986-FEB-21 6661.78 Vancouver Tester 03 James Smith 1978-DEC-12 1990-MAR-15 6544.78 Vancouver Tester 04 Celia Rice 1982-OCT-24 1999-APR-21 2344.78 Vancouver Manager 05 Robert Black 1984-JAN-15 1998-AUG-08 2334.78 Vancouver Tester 06 Linda Green 1987-JUL-30 1996-JAN-04 4322.78 New York Tester 07 David Larry 1990-DEC-31 1998-FEB-12 7897.78 New York Manager 08 James Cat 1996-SEP-17 2002-APR-15 1232.78 Vancouver Tester 8 rows selected. SQL> SQL> SQL> SQL> --If city equals 'New York', the string 'You are in New York' is returned, otherwise the string 'Not' is returned: SQL> SQL> SELECT id, city, 2 DECODE(city, 'New York', 'You are in New York', 3 'Not') 4 FROM employee; ID CITY DECODE(CITY,'NEWYOR ---- ---------- ------------------- 01 Toronto Not 02 Vancouver Not 03 Vancouver Not 04 Vancouver Not 05 Vancouver Not 06 New York You are in New York 07 New York You are in New York 08 Vancouver Not 8 rows selected. SQL> SQL> SQL> -- clean the table SQL> drop table Employee 2 / Table dropped. SQL> SQL>