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6.8

How do you create a select statement that dynamically converts rows into columns ?

Asked by falconsoft in Oracle Database

Tags: oracle, table_rows

Basically I want to get this data displayed in the format returned by the two last statements
where the number of columns is defined dynamically and not explicitly in the statement.

Something where the column name is the grouped value of the rows.  (crosstab views)

/* Sample statements */

DROP TABLE var_data ;

CREATE TABLE var_data
 (key_id      NUMBER,
  column_name VARCHAR2(30),
  data_value  VARCHAR2(30)) ;

desc var_data

insert into var_data values (1, 'C1', 'V1') ;
insert into var_data values (1, 'C2', 'V2') ;

insert into var_data values (2, 'C1', 'V3') ;
insert into var_data values (2, 'C2', 'V4') ;

insert into var_data values (3, 'C1', 'V5') ;
insert into var_data values (3, 'C2', 'V6') ;
insert into var_data values (3, 'C3', 'V7') ;

commit ;

set heading on
select * from var_data ;

key_id  column_name      data_value
------  -----------     ----------
1      C1            V1
1      C2            V2
2      C1            V3
2      C2            V4
3      C1            V5
3      C2            V6
3      C3            V7

-- Oracle 7.3 and above
select key_id, max(C1) C1, max(C2) C2
  from (select key_id, decode(column_name, 'C1', data_value, NULL) C1, decode(column_name, 'C2', data_value, NULL) C2
        from var_data)
group by key_id ;

key_id  C1      C2
------  --      --
1      V1      V2
2      V3      V4
3      V5      V6

-- Oracle 8.1.6 and above
SELECT key_id,
       MAX((CASE WHEN column_name = 'C1' THEN data_value END)) C1,
       MAX((CASE WHEN column_name = 'C2' THEN data_value END)) C2
  from var_data
GROUP by key_id ;

key_id  C1      C2
------  --      --
1      V1      V2
2      V3      V4
3      V5      V6



/* END Sample statements */

[+][-]11/13/00 07:51 AM, ID: 5296799

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About this solution

Zone: Oracle Database
Tags: oracle, table_rows
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Solution Provided By: randyd
Participating Experts: 5
Solution Grade: B
 
 
[+][-]04/29/02 02:33 PM, ID: 6978713

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