Do we not have an oracle function to select the non-null columns at the beginning

Hello

I have 8 columns. Some of them may be null.

I want to display all 8 columns in my result. Columns not null will be first and no one at the end.

Here is an example of data:

Employee table:
 Employee_id   Emp_fname  emp_lname  emp_mname  dept salary emp_height  emp_weight
   1               aaa        ddd                d1   100      6           180
   2               bbb                ccc             120                 169
   3               dfe                           d2            5.9         223
The expected result is:
result1 result2   result3 result4  result5  result6 result7 result8
1        aaa        ddd     d1       100     6        180
2        bbb        ccc     120      169
3        dfe        d2      5.9      223
Thank you.

Published by: BluShadow on July 12, 2012 16:12
addition of {noformat}
{noformat} tags for readability.  Please read {message:id=9360002} and do this yourself in future.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       

945559 wrote:
I'm using Oracle Database 11 g Release 11.2.0.3.0.

Here is my sample data.

CREATE TABLE saleshist (product VARCHAR2 (30), q1 NUMBER NUMBER of q2, q3 NUMBER, NUMBER of T4);
INSERT INTO saleshist VALUES ('EE Oracle', 100, 123, null, 128);
INSERT INTO saleshist VALUES (null, 'Partitioning', 100, 130, 128);

desired output:
col1, col2, col3 col4
'Oracle EE', 100, 123, 128, null
"Partitioning", 100,130,128, null

It seems that you have 4 column headers, but 5 columns.

Assuming that the character ' ~' never occurs in one of the columns:

WITH   got_list           AS
(
     SELECT     '~' || product
          || '~' || TO_CHAR (q1)
          || '~' || TO_CHAR (q2)
          || '~' || TO_CHAR (q3)
          || '~' || TO_CHAR (q4)     AS list
     FROM    saleshist
)
SELECT  REGEXP_SUBSTR (list,  '[^~]+', 1, 1)     AS col1
,       REGEXP_SUBSTR (list,  '[^~]+', 1, 2)     AS col2
,       REGEXP_SUBSTR (list,  '[^~]+', 1, 3)     AS col3
,       REGEXP_SUBSTR (list,  '[^~]+', 1, 4)     AS col4
,       REGEXP_SUBSTR (list,  '[^~]+', 1, 5)     AS col5
FROM    got_list
;

Output:

COL1            COL2       COL3       COL4       COL5
--------------- ---------- ---------- ---------- ----------
Oracle EE       100        123        128
Partitioning    100        130        128

If you need a multiple character string, such as '? ~', to delimit the columns, then the same basic approach works, but the regular expression is messier.

Product is just another column in this solution. Can be NULL, and it doesn't have to be unique.

Tags: Database

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