Question

I have two tables in my database Table A And Table B –

                   Table `A`
    SN   |    Order1    |   Order2   |   Text
 (INT)   |   (TINYINT)  |  (TINYINT) |  (VARCHAR)
   1001  |      1       |      1     |    ABC
   1001  |      1       |      2     |    DEF
   1001  |      1       |      3     |    GHI
   1001  |      2       |      1     |    IOU
   1001  |      3       |      1     |    JKL     <--
   1001  |      3       |      2     |    LMO
   1001  |      3       |      3     |    UTF
   ....
   1021  |      1       |      1     |    ZXC
   1021  |      1       |      2     |    QWE
   1021  |      2       |      1     |    JKL     <--
   1021  |      3       |      1     |    YOU

And In Another Table

                   Table `B`
    SN   |    Order1    |     rSN    |   rOrder1
   1021  |      2       |     1001   |      3

Now when I query for the data of 1021 the result should be like :-

         Result Needed

    1    |      1     |    ZXC
    1    |      2     |    QWE
    2    |      1     |    JKL
    2    |      2     |    LMO
    2    |      3     |    UTF
    3    |      1     |    YOU

---

Presently I am trying somthing Like this –

SELECT `SN`, `Order1`, `Order2`, `Text` FROM `Table A` 
  WHERE `SN`=1012 
UNION  
SELECT `SN`, `Order1`, `Order2`, `Text` FROM `Table A`  
  WHERE `Table A`.`SN` 
  IN (SELECT  `rSN` FROM `Table B` WHERE `SN`=1021) 
  AND `Table A`.`Order1` 
  IN (SELECT  `Order1` FROM `Table B` WHERE `SN`=1021) 

Which Is giving the Results Like this :-

             Result
  SN | Order1 |   Order2   |    Text
 1021|   1    |      1     |    ZXC
 1021|   1    |      2     |    QWE
 1021|   2    |      1     |    JKL
 1021|   3    |      1     |    YOU
 1001|   3    |      1     |    JKL
 1001|   3    |      2     |    LMO
 1001|   3    |      3     |    UTF

What should I do to get the Order1 and Order2 of the last three rows of the result be same as the referring Row i.e. like 1001 | 2 | 2 | LMO

Edit —

Here I am Thinking to get the Order1 values of the 1001 to be same as Order1 of 1012 when query gives the data output.

As The Order Of the Text Is important.

The Order2 Text is related to its corresponding first value in this Group In Order1
And Table B Stores reference to the already entered duplicate related Text in the database and defines its position in the corresponding SN

Answer 1

I found the solution myself : –

Solution

SELECT `Order1`, `Order2`, `Text` FROM `Table A` WHERE `SN` = 1012
UNION DISTINCT
SELECT `Table B`.`Order1`,  `Table A`.`Order2`, `Table A`.`Text` 
FROM  `Table A` JOIN  `Table B` 
WHERE  `Table B`.`rSN` =  `Table A`.`SN` 
      AND  `Table B`.`Order1` =  `Table A`.`Order1` 
      AND `Table B`.`SN` = 1021
ORDER BY `Order1`, `Order2`

Explanation

The First SELECT Selects the Rows associated with 1021

In Second Part of query, I wanted the Text Of the referred SN i.e. 1001‘s row’s having Order1 value 3(See Table B).
But as the referring SN i.e. 1021 have its Order1 value 2, WHERE its Text is JKL (See Table A, Pointed Row (“<–“) with 1021 SN)
So We want All the values of Order1 of Text associated with 1001 | 3 | Formatted As 1001 | 2 |
For this above problem JOIN Works, Joining gives a table like :-

SELECT *  FROM  `Table A` JOIN  `Table B` 
WHERE  `Table B`.`rSN` =  `Table A`.`SN` 
  AND  `Table B`.`Order1` =  `Table A`.`Order1` 
  AND `Table B`.`SN` = 1021

            Table `B`                            Table `A`
 SN  | Order1 |  rSN | rOrder1     ||    SN | Order1 | Order2 | Text
1021 |   2    | 1001 |    3        || 1001  |    3   |    1   | JKL 
1021 |   2    | 1001 |    3        || 1001  |    3   |    2   | LMO
1021 |   2    | 1001 |    3        || 1001  |    3   |    3   | UTF

And From this result we can Pick up the result set.
Understanding how 2, 2, LMO comes -> It is here Now we are picking up the Table B.Order1 From the JOIN result Instead like earlier we were Picking up the Order1 Of the 1001 instead, which then results into ordering which we didn’t wanted.

why isn't 1, 3, GHI required as a part of result -> As Its Like Related Information,
The Information with same Order1 show the related words/information to each other and since 1021 Do not have any related information to 1, 3, GHI Hence It is not required in the result part.

And as Now we already getting the Order1 of the second query same as it should be 2 not 3 We can now easily Order Them by Order clause

I hope this will clarify the question also.
Still Thanks everyone 🙂

—— EDIT ——-

DISTINCT in UNION will remove the Duplicate Entry of JKL From the final results