UNPIVOT on multiple columns to return multiple columns

问题

Below is the requirement to be acheived in PL/SQL-

The table format is

CREATE TABLE NETWORK_TABLE ( ORIG_CODE NUMBER, ORIG_SV NUMBER, DEST_CODE NUMBER, DEST_SV NUMBER )

Sample Data -

INSERT INTO network_table VALUES ( 14, 1, 15, 1);

INSERT INTO network_table VALUES ( 18, 4, 11, 1);

INSERT INTO network_table VALUES ( 15, 1, 22, 3);

INSERT INTO network_table VALUES ( 23, 2, 21, 1);

INSERT INTO network_table VALUES ( 14, 3, 11, 1);

INSERT INTO network_table VALUES ( 12, 2, 22, 2);

Table data looks like -

Orig_r  orig_sv  dest_r dest_sv
  14     1       15     1 
  12     2       22     2 
  18     4       11     1 
  15     1       22     3 
  14     3       11     1

Now, I want to get the output as below -

How can I acheive this? Appreciate your input

回答1:

like this:

SQL> select * from network_table;

 ORIG_CODE    ORIG_SV  DEST_CODE    DEST_SV
---------- ---------- ---------- ----------
        14          1         15          1
        12          2         22          2
        18          4         11          1
        15          1         22          3
        14          3         11          1

SQL> select case name when 'ORIG_SV' then orig_code else dest_code end code, val 
  2  from network_table 
  3  unpivot (val for name in (orig_sv, dest_sv));

      CODE        VAL
---------- ----------
        14          1
        15          1
        12          2
        22          2
        18          4
        11          1
        15          1
        22          3
        14          3
        11          1

or 10g and below:

SQL> select case  r when 1 then orig_code else dest_code end code,
  2         case r when 1 then orig_sv else dest_sv end val
  3    from network_table, (select rownum r from dual connect by level <= 2)
  4  /

      CODE        VAL
---------- ----------
        14          1
        12          2
        18          4
        15          1
        14          3
        15          1
        22          2
        11          1
        22          3
        11          1

回答2:

You can use a UNION ALL to transform the data from columns into rows.:

select ORIG_CODE Root, ORIG_SV SV
from network_table
union all
select DEST_CODE, DEST_SV  
from network_table
order by root

See SQL Fiddle with Demo

The UNION ALL will leave any duplicate values. If you want to remove the duplicates, then you can use UNION

来源：https://stackoverflow.com/questions/14365848/unpivot-on-multiple-columns-to-return-multiple-columns

标签

sql

Oracle

unpivot