Adding new data in columns, from another table - SQL ORACLE

Question

I have a table with some records

MASTER TABLE

x------x--------------------x-------x
| Id   |      PERIOD        |   QTY |
x------x--------------------x-------x
|  1   |   2014-01-13       |   10  |
|  2   |   2014-01-06       |   30  |
x------x--------------------x-------x

I have another table with parameters of this record (ID)

TABLE2

x------x--------------------x------------x
| Id   |      Parameter        |   Value |
x------x--------------------x------------x
|  1   |   Humidty             |   10    |
|  1   |   Temperature         |   30    |
|  2   |   Humidty             |   50    |
|  2   |   Temperature         |   40    |
x------x--------------------x------------x

As result I want this: (combine based on ID)

Result table

x------x--------------------x-------------------------x
| Id   |      Period        |   Humidty | Temperature |
x------x--------------------x-------------------------x
|  1   |   2014-01-13       |   10      | 30          |
|  2   |   2014-01-06       |   50      | 40          |
x------x--------------------x-------------------------x

How Can I do something like that? Inner join will not work I think.

Answer 1

Join the tables and use conditional aggregation with case to extract the 2 columns:

select t1.id, t1.period,
  max(case when t2.parameter = 'Humidty' then t2.value end) Humidty,
  max(case when t2.parameter = 'Temperature' then t2.value end) Temperature
from mastertable t1 inner join table2 t2
on t2.id = t1.id
group by t1.id, t1.period

Answer 2

You can pivot :

SELECT * FROM 
(
SELECT 
  t_m.Id
, t_m.Period 
, t_2.Parameter
, t_2.Value
FROM @tbl_Master t_m
INNER JOIN @tbl_2 t_2 ON t_2.Id = t_m.Id
)AS t
PIVOT 
(
    MAX(t.Value)
    FOR t.Parameter IN ([Humidity], [Temperature])
)pvt

and sample data:

DECLARE @tbl_Master TABLE
(
   Id int,
   Period Date,
   QTY int

)

DECLARE @tbl_2 TABLE
(
   Id int,
   Parameter varchar(30),
   [Value] int

)

INSERT INTO @tbl_Master
(
    Id,
    Period,
    QTY
)
VALUES
  (1, '2014-01-13', 10)
, (2, '2014-01-06', 30)


INSERT INTO @tbl_2
(
    Id ,
   Parameter ,
   [Value] 
)
VALUES
  ( 1, 'Humidity', 10)
, ( 1, 'Temperature' , 30)
, ( 2, 'Humidity', 50)
, ( 2, 'Temperature' , 40)

OUTPUT:

Id    Period    Humidity       Temperature
1   2014-01-13    10            30
2   2014-01-06    50            40

Answer 3

Try this

DECLARE @Mastertable AS TABLE(Id INT,PERIOD DATE,QTY INT)
INSERT INTO @Mastertable
SELECT 1 ,'2014-01-13', 10  UNION ALL
SELECT 2 ,'2014-01-06', 30

DECLARE @Childtable AS TABLE(Id INT,Parameter  VARCHAR(100), Value INT)
INSERT INTO @Childtable
SELECT  1  ,'Humidty'             ,   10  UNION ALL
SELECT  1  ,'Temperature'         ,   30  UNION ALL
SELECT  2  ,'Humidty'             ,   50  UNION ALL
SELECT  2 , 'Temperature'          ,   40  

SELECT  Id,Period,[Humidty],[Temperature]
FROM
(
SELECT  c.Id,
        m.PERIOD,
        Parameter,
        c.Value
 FROM @Mastertable m
INNER JOIN  @Childtable c
ON m.Id = c.Id
) AS srC
pivot 
(MAX(Value) FOR Parameter IN ([Humidty],[Temperature])
) AS PVT

Result

Id  Period      Humidty Temperature
----------------------------------
1   2014-01-13    10      30
2   2014-01-06    50      40