Question

I have type column in my table, type column value is HOT andNOT. from that i want to display HOT and NOT values of the column in to one line.

Example

Table1

Period ID Total

11/2011 101 250
12/2011 102 350
11/2011 103 450
....

Table2

Period ID Type Value

11/2011 101 NOT 500
11/2011 101 HOT 200
12/2011 102 NOT 300
12/2011 102 HOT 200
....

I want to display type (Hot and Not) in to one line

Expected Output

Period ID NOT HOT Total

11/2011 101 500 200 250
12/2011 102 300 200 350
11/2011 103 300 400 450
....

How to make a query.

Answer 1

If I can assume that table1 has a primary key of (Period, ID) and table2 has a primary key of (Period, ID, Type), then you can do:

select
    t1.period
    , t1.id
    , t2n.value [not]
    , t2h.value [hot]
    , t1.total
from
    table1 t1
    left join table2 t2n
        on t1.period = t2n.period
        and t1.id = t2n.id
        and t2n.type = 'Not'
    left join table2 t2h
        on t1.period = t2h.period
        and t1.id = t2h.id
        and t2h.type = 'Hot'

This will retrieve all rows from table 1, with their corresponding “not” and “hot” counterparts, respective to t2n and t2h above.