sql doubt on joining column with rows & select within a select in this case

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i have a table A and table B.

tableA

id  columnnamesA  

1    col1
2    col2
3    col3


tableB

daterpt     col1  col1 col3
29-01-2015   45    55   12

Now i was trying to get the result in this format.

id columnnamesA    value
1     col1         45
2     col2         55
3     col3         12

-- i tried some approach and was able to ahieve it..but i thought to try in this way

select id,columnname,(select columnname from tableB where daterpt='29-01-2015')
from tableA

but this doesnt work. Is there a way to achieve it as above. Please suggest

Posted 2-Feb-16 17:56pm

anurag19289

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Comments

Tomas Takac 3-Feb-16 2:44am

You need to unpivot tableB then join to tableA. If the set of columns is not fixed then you need to employ dynamic sql to unpivot it.

Herman<T>.Instance 3-Feb-16 3:36am

Exactly. The only option is to UNPIVOT

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Manas_Kumar · Answer 1 · 2016-02-02T22:06:00

Try with below SQL query:

SQL

create table tableA(id int, columnname varchar(10));
INSERT INTO tableA VALUES(1, 'col1');
INSERT INTO tableA VALUES(2, 'col2');
INSERT INTO tableA VALUES(3, 'col3');

create table tableB(daterpt datetime, col1 int, col2 int, col3 int);
INSERT INTO tableB VALUES('10-10-2016', 45, 55, 12);

select temp1.id, temp1.column, temp2.value from tableA temp1
INNER JOIN (select u.column, u.value
from tableB s
unpivot
(
  value
  for column in (col1, col2, col3)
) u) as temp2
ON temp1.column = temp2.column;