Unpivot data

Please find the tested solution below -

Table creation and data generation

CREATE TABLE classes
(
	 Id  INT 
	,class1 DECIMAL(10,3)
);

INSERT INTO classes VALUES (123,.001);
INSERT INTO classes VALUES (123,.002);

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SOLUTION

SELECT Id , MAX(CASE WHEN rnk = 1 THEN Class1 END) Class1
		  , MAX(CASE WHEN rnk = 2 THEN Class1 END) Class2
		  , MAX(CASE WHEN rnk = 3 THEN Class1 END) Class3
		  , MAX(CASE WHEN rnk = 4 THEN Class1 END) Class4
		  , MAX(CASE WHEN rnk = 5 THEN Class1 END) Class5
		  , MAX(CASE WHEN rnk = 6 THEN Class1 END) Class6
		  , MAX(CASE WHEN rnk = 7 THEN Class1 END) Class7
		  , MAX(CASE WHEN rnk = 8 THEN Class1 END) Class8
		  , MAX(CASE WHEN rnk = 9 THEN Class1 END) Class9
		  , MAX(CASE WHEN rnk = 10 THEN Class1 END) Class10
		  , MAX(CASE WHEN rnk = 11 THEN Class1 END) Class11
		  , MAX(CASE WHEN rnk = 12 THEN Class1 END) Class12
		  , MAX(CASE WHEN rnk = 13 THEN Class1 END) Class13
		  , MAX(CASE WHEN rnk = 14 THEN Class1 END) Class14
		  , MAX(CASE WHEN rnk = 15 THEN Class1 END) Class15
		  , MAX(CASE WHEN rnk = 16 THEN Class1 END) Class16
		  , MAX(CASE WHEN rnk = 17 THEN Class1 END) Class17
		  , MAX(CASE WHEN rnk = 18 THEN Class1 END) Class18
		  , MAX(CASE WHEN rnk = 19 THEN Class1 END) Class19
		  , MAX(CASE WHEN rnk = 20 THEN Class1 END) Class20
		  , MAX(CASE WHEN rnk = 21 THEN Class1 END) Class21
		  , MAX(CASE WHEN rnk = 22 THEN Class1 END) Class22
		  , MAX(CASE WHEN rnk = 23 THEN Class1 END) Class23
		  , MAX(CASE WHEN rnk = 24 THEN Class1 END) Class24
		  , MAX(CASE WHEN rnk = 25 THEN Class1 END) Class25
		  , MAX(CASE WHEN rnk = 26 THEN Class1 END) Class26
		  , MAX(CASE WHEN rnk = 27 THEN Class1 END) Class27
		  , MAX(CASE WHEN rnk = 28 THEN Class1 END) Class28
		  , MAX(CASE WHEN rnk = 29 THEN Class1 END) Class29
		  , MAX(CASE WHEN rnk = 30 THEN Class1 END) Class30
		  , MAX(CASE WHEN rnk = 31 THEN Class1 END) Class31
		  , MAX(CASE WHEN rnk = 32 THEN Class1 END) Class32
		  , MAX(CASE WHEN rnk = 33 THEN Class1 END) Class33
		  , MAX(CASE WHEN rnk = 34 THEN Class1 END) Class34
		  , MAX(CASE WHEN rnk = 35 THEN Class1 END) Class35
		  , MAX(CASE WHEN rnk = 36 THEN Class1 END) Class36
		  , MAX(CASE WHEN rnk = 37 THEN Class1 END) Class37
		  , MAX(CASE WHEN rnk = 38 THEN Class1 END) Class38
		  , MAX(CASE WHEN rnk = 39 THEN Class1 END) Class39
		  , MAX(CASE WHEN rnk = 40 THEN Class1 END) Class40
		  , MAX(CASE WHEN rnk = 41 THEN Class1 END) Class41
		  , MAX(CASE WHEN rnk = 42 THEN Class1 END) Class42
		  , MAX(CASE WHEN rnk = 43 THEN Class1 END) Class43
		  , MAX(CASE WHEN rnk = 44 THEN Class1 END) Class44
		  , MAX(CASE WHEN rnk = 45 THEN Class1 END) Class45
		  , MAX(CASE WHEN rnk = 46 THEN Class1 END) Class46
		  , MAX(CASE WHEN rnk = 47 THEN Class1 END) Class47
		  , MAX(CASE WHEN rnk = 48 THEN Class1 END) Class48
		  , MAX(CASE WHEN rnk = 49 THEN Class1 END) Class49
		  , MAX(CASE WHEN rnk = 49 THEN Class1 END) Class50			
FROM 
(
	SELECT Id,Class1 , ROW_NUMBER() OVER (PARTITION BY Id ORDER BY Class1) rnk FROM classes
)i
GROUP BY ID;

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OUTPUT

|  ID | CLASS1 | CLASS2 | CLASS3 | CLASS4 | CLASS5 | CLASS6 | CLASS7 | CLASS8 | CLASS9 | CLASS10 | CLASS11 | CLASS12 | CLASS13 | CLASS14 | CLASS15 | CLASS16 | CLASS17 | CLASS18 | CLASS19 | CLASS20 | CLASS21 | CLASS22 | CLASS23 | CLASS24 | CLASS25 | CLASS26 | CLASS27 | CLASS28 | CLASS29 | CLASS30 | CLASS31 | CLASS32 | CLASS33 | CLASS34 | CLASS35 | CLASS36 | CLASS37 | CLASS38 | CLASS39 | CLASS40 | CLASS41 | CLASS42 | CLASS43 | CLASS44 | CLASS45 | CLASS46 | CLASS47 | CLASS48 | CLASS49 | CLASS50 |
|-----|--------|--------|--------|--------|--------|--------|--------|--------|--------|---------|---------|---------|---------|---------|---------|---------|---------|---------|---------|---------|---------|---------|---------|---------|---------|---------|---------|---------|---------|---------|---------|---------|---------|---------|---------|---------|---------|---------|---------|---------|---------|---------|---------|---------|---------|---------|---------|---------|---------|---------|
| 123 |  0.001 |  0.002 | (null) | (null) | (null) | (null) | (null) | (null) | (null) |  (null) |  (null) |  (null) |  (null) |  (null) |  (null) |  (null) |  (null) |  (null) |  (null) |  (null) |  (null) |  (null) |  (null) |  (null) |  (null) |  (null) |  (null) |  (null) |  (null) |  (null) |  (null) |  (null) |  (null) |  (null) |  (null) |  (null) |  (null) |  (null) |  (null) |  (null) |  (null) |  (null) |  (null) |  (null) |  (null) |  (null) |  (null) |  (null) |  (null) |  (null) |

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Are all class columns in tableB the same type as the Class1 column in tableA ? Will this be a one time effort or an ongoing need?

Yes they will be same and need will be ongoing

Pawan I need to compare two tables if data in table a then try to check all columns in tableb to find matching data

What version of Oracle are you using?

Also, is the data type number or varchar2?

Oracle 11 datatype varchar2

what are the results you are expecting?

You may need to provide more sample data in order to post a meaningful result set.

if you're just looking for the table A data that also exists in table B, the "exists" clause should work nicely

WITH
    tablea
    AS
        (SELECT 123 id, '001' class1 FROM DUAL
         UNION ALL
         SELECT 123, '002' FROM DUAL),
    tableb AS (SELECT 123 id, '002' class1, '001' class2, '002' class3 FROM DUAL)
SELECT *
  FROM tablea a
 WHERE EXISTS
           (SELECT NULL
              FROM tableb b
             WHERE a.id = b.id AND a.class1 IN (b.class1, b.class2, b.class3))


If that's not what you're looking for, please illustrate with a representative sample set and expected results.

@Author - We can use UNPIVOT and JOIN method to get the required data.

Table Creation and data generation.

CREATE TABLE MyClass
(
   Id INTEGER
  ,Class1 DECIMAL(10,5)
  ,class2 DECIMAL(10,5)
  ,class3 DECIMAL(10,5)
)
\\

INSERT INTO MyClass VALUES(123,0.002,0.001,0.002) 
\\

CREATE TABLE classes
(
	 Id  INT 
	,class1 DECIMAL(10,3)
)
\\

INSERT INTO classes VALUES (123,.001)\\
INSERT INTO classes VALUES (123,.002)\\

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SOLUTION

WITH CTE
AS
(
    SELECT Id,Class1,Class2,Class3,ROW_NUMBER() OVER (PARTITION BY ID ORDER BY Id) rnk FROM MyClass
)
,CTE1 AS 
(
    SELECT Id,Class FROM CTE 
    UNPIVOT
     (
         class                      
         FOR r                  
         IN  (Class1, Class2, Class3) 
    )
)
SELECT * FROM CTE1 c INNER JOIN classes c1 
ON c.Class = c1.class1
\\

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OUTPUT

  	ID	CLASS	ID	CLASS1
1	123	0,002	123	0,002
2	123	0,001	123	0,001
3	123	0,002	123	0,002

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Note - Tested on http://rextester.com/l/oracle_online_compiler