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combining data

Author

Topic

sparrow37
Posting Yak Master

148 Posts

Posted - 2009-05-15 : 16:01:08

Hi all,

How can i combine following two tables to generate the output using sql.

table 1

pid qty user
2 3 0
3 1 0
4 2 0

table 2

pid qty user
2 2 1
3 2 1

output

pid qty user
2 5 1
3 3 1
4 2 1

rule is:
if data exists in table 2 , then update qty with qty from table 1 else change user to 1 and add in output

jhocutt
Constraint Violating Yak Guru

385 Posts

Posted - 2009-05-15 : 16:16:41

declare @table1 table (pid int, qty int, [user] int)
declare @table2 table (pid int, qty int, [user] int)
insert into @table1
select 2, 3, 0 union all
select 3, 1, 0 union all
select 4, 2, 0

insert into @table2
select 2, 2, 1 union all
select 3, 2, 1

select
t1.pid,
case when t2.pid is null then t1.qty else t1.qty+t2.qty end as new_qty,
case when t2.pid is null then t1.[user] else t2.[user] end as new_user
from @table1 t1
left join @table2 t2 on t1.pid=t2.pid

"God does not play dice" -- Albert Einstein
"Not only does God play dice, but he sometimes throws them where they cannot be seen."
-- Stephen Hawking

visakh16
Very Important crosS Applying yaK Herder

52326 Posts

Posted - 2009-05-16 : 02:52:20

[code]SELECT pid,
SUM(qty) AS qty,
CASE WHEN COUNT(DISTINCT Cat) =2 THEN MAX(user) ELSE 1 END AS user
FROM
(
SELECT pid, qty, user,1 AS Cat
FROM Table1
UNION ALL
SELECT pid, qty, user,2
FROM Table2
)t
GROUP BY pid
[/code]

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