decode column data to output more meaningful information : DECODE « Conversion Functions « Oracle PL / SQL

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Oracle PL / SQL » Conversion Functions » DECODE 
decode column data to output more meaningful information
    

SQL> create table gift(
  2           gift_id                integer         primary key
  3          ,emp_id                integer
  4          ,register_date              date not null
  5          ,total_price        number(7,2)
  6          ,deliver_date           date
  7          ,deliver_time           varchar2(7)
  8          ,payment        varchar2(2)
  9          ,emp_no                 number(3,0)
 10          ,deliver_name           varchar2(35)
 11          ,message        varchar2(100)
 12  );

Table created.

SQL>
SQL> insert into gift(gift_id,emp_id,register_date,total_price,deliver_date,deliver_time,payment,emp_no,deliver_name,message)values
  2                 (1,1,'14-Feb-1999', 123.12'14-Feb-1999', '12 noon', 'CA',1, null, 'Happy Birthday to you');

row created.

SQL> insert into gift(gift_id  ,emp_id ,register_date ,total_price ,deliver_date ,deliver_time ,payment ,emp_no,deliver_name ,message)values
  2                 (2,1,'14-Feb-1999', 50.98'14-feb-1999', '1 pm', 'CA',7'name1', 'Happy Birthday');

row created.

SQL> insert into gift(gift_id  ,emp_id ,register_date ,total_price ,deliver_date ,deliver_time,payment ,emp_no,deliver_name ,message )values
  2                 (32,'14-Feb-1999', 35.99'14-feb-1999', '1 pm', 'VS',2'Tom', 'Happy Birthday');

row created.

SQL> insert into gift(gift_id  ,emp_id ,register_date ,total_price ,deliver_date ,deliver_time,payment ,emp_no,deliver_name ,message )values
  2                 (42,'14-Feb-1999', 19.95'14-feb-1999', '5 pm', 'CA',2'Mary', 'Happy Birthday');

row created.

SQL> insert into gift(gift_id  ,emp_id ,register_date ,total_price ,deliver_date ,deliver_time,payment ,emp_no,deliver_name ,message)values
  2                 (56,'4-mar-1999', 10.95'5-mar-1999', '4:30 pm', 'VS', 2'Jack', 'Happy Birthday');

row created.

SQL>
SQL>
SQL>
SQL> select gift_id, decode(payment,
  2  'VS', 'VISA Card Standard',
  3  'VG', 'VISA Gold Card',
  4  'AX', 'American Express',
  5  'MC', 'Master Card',
  6  'DI', 'Discover Card',
  7  'CA', 'Cash',
  8  'CK', 'Check',
  9  'Unknown')
 10    from gift ;

   GIFT_ID DECODE(PAYMENT,'VS
---------- ------------------
         Cash
         Cash
         VISA Card Standard
         Cash
         VISA Card Standard

rows selected.

SQL>
SQL>
SQL> drop table gift;

Table dropped.

   
    
    
    
  
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10.Decode the result from row_number over, partition by, order by
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13.Format nullable heading
14.DECODE in the GROUP BY clause
15.Demo range comparison with DECODE
16.Use decode as if statement and output 'high' or 'low'
17.Use decode create dynamic select statement
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