To find a value that does not move to columns

Version of database 11g (11.2.0.3.0)
AIX OPERATING SYSTEM

I'm writing some SQL/PLSQL, who selects a value in a table that is not always in the same column. I need to find which column is on a table, then use this place of the column to find its value coresponding on another table.

Example:

CREATE TABLE TIMES (RUN_ID  NUMBER(10),TIME1 NUMBER(10), TIME2 NUMBER(10), TIME3 NUMBER(10), TIME4 NUMBER(10),TIME5 NUMBER(10));
CREATE TABLE VALS (RUN_ID  NUMBER(10),VAL1 NUMBER(10), VAL2 NUMBER(10), VAL3 NUMBER(10), VAL4 NUMBER(10),VAL5 NUMBER(10));

INSERT INTO TIMES VALUES (1000, 1,2,3,4,5);                          
INSERT INTO TIMES VALUES (1001, 2,3,4,5,6);                          
INSERT INTO TIMES VALUES (1002, 3,4,5,6,7);                          

INSERT INTO VALS VALUES (1000, 101,102,103,104,105);                          
INSERT INTO VALS VALUES (1001, 106,107,108,109,110);                          
INSERT INTO VALS VALUES (1002, 111,112,113,114,115);                          

SQL> select * from times;

    RUN_ID      TIME1      TIME2      TIME3      TIME4      TIME5
---------- ---------- ---------- ---------- ---------- ----------
      1000          1          2          3          4          5
      1001          2          3          4          5          6
      1002          3          4          5          6          7

SQL> 
select * from vals; 

    RUN_ID       VAL1       VAL2       VAL3       VAL4       VAL5
---------- ---------- ---------- ---------- ---------- ----------
      1000        101        102        103        104        105
      1001        106        107        108        109        110
      1002        111        112        113        114        115

So for a time-say 3, I want to be able to find first the rows and columns, it appears in on the TIME table and the upward gaze of the WALTZ in the same places of the column in the table VALS.

Thus, for example the time 3 above, I want to be able to return:

1000 103 RUN_ID
1001 107 RUN_ID
111 1002 RUN_ID

I got a database that stores values like that so I can't change the way the data is unfortunately inspired. Is there one clever way to do other than look at each TIME column by Union them together, then creating some dynamic sql statements to get the values of the VALS table?

This is a simplified example, but the table has 98 columns!

Any help will be greatly appreciated.

Published by: 991224 on March 1st, 2013 07:13

Hello

Welcome to the forum!

Thanks for posting the CREATE TABLE and INSERT statements; It's very useful!

If you cannot permanently normalize the data, then you can normalize it on the fly.
Here's one way:

WITH   unpivoted_times     AS
(
     SELECT     run_id
     ,     col_num
     ,     t_val     -- If wanted
     FROM     times
     UNPIVOT ( t_val
            FOR  col_num IN ( time1  AS  1
                                    , time2  AS  2
                                    , time3  AS  3
                                    , time4  AS  4
                                    , time5  AS  5
                            )
          )
     WHERE     t_val     IN (3)     -- or whatever
)
SELECT   v.run_id
,      CASE  t.col_num
            WHEN  1  THEN  val1
            WHEN  2  THEN  val2
            WHEN  3  THEN  val3
            WHEN  4  THEN  val4
            WHEN  5  THEN  val5
      END   AS v_val
FROM      unpivoted_times  t
JOIN      vals            v  ON  v.run_id  = t.run_id
;

If the same number of target may occur more than once on the same line at the time, then the above query generates multiple lines with the same run_id. For example, if we change your data a little examples:

-- Don't use this row:
-- INSERT INTO TIMES VALUES (1002, 3,4,5,6,7);
-- Use this row instead:
INSERT INTO TIMES VALUES (1002, 3,3,3,6,7);

Leave all other sample data, as you have it posted, then the output is:

`   RUN_ID      V_VAL
---------- ----------
      1000        103
      1001        107
      1002        111
      1002        112
      1002        113

If you have 98 (not just 5) columns that need to be compared, then you will need to list all 98 of these columns at the time in the UNPIVOT clause and all 98 of vals in the expression BOX. Sorry; I don't see any way around that. You could write dynamic SQL statements to the parts of code for you.

Tags: Database

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