Demo range comparison with DECODE : DECODE « Conversion Functions « Oracle PL / SQL






  1. Oracle PL / SQL
  2. Conversion Functions
  3. DECODE

Demo range comparison with DECODE

   
SQL>
SQL> create table emp(
  2           emp_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          ,shortZipCode           varchar2(4)
 11          ,area_code              varchar2(3)
 12          ,phone                  varchar2(8)
 13          ,salary                 number(5,2)
 14          ,birthdate              date
 15          ,startDate              date
 16          ,title                  varchar2(20)
 17          ,dept_no                integer
 18          ,mgr                    integer
 19          ,region                 number
 20          ,division               number
 21          ,total_sales            number
 22  );

Table created.

SQL>
SQL> -- emp Table Inserts:
SQL> insert into emp(emp_no, lastname, firstname, midinit, street, city, state, zip,shortZipCode, area_code, phone, birthdate, title)values
  2                      (1,'Z','Joy','R','1 Ave','New York','NY','12122','2333','212','200-1111','12-nov-1976','President');

1 row created.

SQL>
SQL> create or replace view avg_Sal
  2  as select trunc(avg(salary)) avg_sal
  3  from emp
  4  /

View created.

SQL>
SQL> select lastname, salary,
  2  decode(  sign( salary - avg_sal ),
  3       1, '> Average of ' || to_char(avg_sal, '99.99') ,
  4       0, '= Average of ' || to_char(avg_sal, '99.99'),
  5          -1, '< Average of ' || to_char(avg_sal, '99.99')  ) sal_desc
  6  from emp, avg_sal
  7  /

Z

1 row selected.

SQL>
SQL> drop table emp;

Table dropped.








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1.Syntax: DECODE
2.Decode char value to number
3.Decode statement could be easily rewritten using the CASE statement
4.Decode for more than one key value pair
5.Use Decode as if statement to logic like 'if then else'
6.DECODE and GROUPING
7.Create a report that shows number of customers per state.
8.Use DECODE and SIGN functions on the ORD table
9.Extract any procedure, function or package
10.Decode the result from row_number over, partition by, order by
11.Decode a column with substr and instr
12.DECODE and substr function
13.Format nullable heading
14.DECODE in the GROUP BY clause
15.Use decode as if statement and output 'high' or 'low'
16.Use decode create dynamic select statement
17.decode column data to output more meaningful information