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SQL>
SQL> -- create demo table
SQL> create table TestTable(
2 ID VARCHAR2(4 BYTE) NOT NULL,
3 MyName VARCHAR2(10 BYTE),
4 MyDate DATE,
5 MyNumber Number(8,2)
6 )
7 /
Table created.
SQL>
SQL>
SQL> insert into TestTable (ID, MyName, MyDate, MyNumber) values('1','Alison',to_date('19960711','YYYYMMDD'),12.12);
1 row created.
SQL> insert into TestTable (ID, MyName, MyDate, MyNumber) values('2','Jason',to_date('19970622','YYYYMMDD'),-12.12);
1 row created.
SQL> insert into TestTable (ID, MyName, MyDate, MyNumber) values('3','Smith',to_date('19980513','YYYYMMDD'),22.1);
1 row created.
SQL> insert into TestTable (ID, MyName, MyDate, MyNumber) values('4','Tailor',to_date('19990624','YYYYMMDD'),-2.12);
1 row created.
SQL> insert into TestTable (ID, MyName, MyDate, MyNumber) values('5','Darlene',to_date('20000415','YYYYMMDD'),NULL);
1 row created.
SQL>
SQL>
SQL> select * from TestTable;
ID MYNAME MYDATE MYNUMBER
---- ---------- --------- ----------
1 Alison 11-JUL-96 12.12
2 Jason 22-JUN-97 -12.12
3 Smith 13-MAY-98 22.1
4 Tailor 24-JUN-99 -2.12
5 Darlene 15-APR-00
SQL>
SQL> -- NVL: Returns a substitute (some other value) if a value is null.
SQL>
SQL>
SQL> SELECT MyNumber, NVL(MyNumber, 10) From TestTable;
MYNUMBER NVL(MYNUMBER,10)
---------- ----------------
12.12 12.12
-12.12 -12.12
22.1 22.1
-2.12 -2.12
10
SQL>
SQL>
SQL>
SQL>
SQL>
SQL> drop table TestTable;
Table dropped.
SQL>
SQL>
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