Right join multiple key where mutiple key is null - sql

Question

I need help from captain obvious I suppose. I'm trying to Insert data from a table into a temptable. Ok this is easy
I need to insert the data we got today and the data we got 10 days ago. The where clause may aford it, th's okay
What for me is hard is to insert the data of today only if it does not appear in the data 10 days ago
An exemple of the table I use ([datatable]) :
Date Purchase Line_Purchase
---------------------------------------------------------------------------
2017-04-29 0000002 01
2017-04-29 0000002 02
2017-04-29 0000003 01
2017-04-29 0000003 02
2017-04-29 0000003 03
2017-04-29 0000004 01
2017-04-29 0000005 01
2017-04-19 0000001 01
2017-04-19 0000001 02
2017-04-19 0000001 03
2017-04-19 0000002 01
2017-04-19 0000002 02
My desired table temptable:
Input_date Purchase Line_Purchase
-------------------------------------------------------------------------
2017-04-19 0000001 01
2017-04-19 0000001 02
2017-04-19 0000001 03
2017-04-19 0000002 01
2017-04-19 0000002 02
2017-04-29 0000003 01
2017-04-29 0000003 02
2017-04-29 0000003 03
2017-04-29 0000004 01
2017-04-29 0000005 01
Is there any request possible in SQL that can change that ?
I tried this way
INSERT INTO #TEMPTABLE
(Input_date ,Purchase ,Line_Purchase)
SELECT
table.Date
,table.Purchase
,table.Line_Purchase
FROM
datatable table
WHERE
convert(date, table.Date) = convert(date, GETDATE() - 10)
INSERT INTO #TEMPTABLE
(Input_date ,Purchase ,Line_Purchase)
SELECT
table.Date
,table.Purchase
,table.Line_Purchase
FROM
datatable table
RIGHT JOIN #TEMPTABLE temp
on table.Purchase = temp.Purchase and table.Line_Purchase = temp.Line_Purchase
WHERE
convert(date, table.Date) = convert(date, GETDATE())
AND (temp.Purchase is null AND temp.Line_Purchase is null)
Thanks in advance

Answer 1

You can do this with not exists():
select date as Input_date, Purchase, Line_Purchase
into #temptable
from t
where date = '2017-04-19' --convert(date, getdate() - 10);
insert into #temptable (Input_date, Purchase, Line_Purchase)
select *
from t
where date = '2017-04-29'
and not exists (
select 1
from t as i
where i.purchase=t.purchase
and i.line_purchase=t.line_purchase
and i.date = '2017-04-19' --convert(date, getdate() - 10)
);
select *
from #temptable;
rextester demo: http://rextester.com/SAQSG21367
returns:
+------------+----------+---------------+
| Input_Date | Purchase | Line_Purchase |
+------------+----------+---------------+
| 2017-04-19 | 0000001 | 01 |
| 2017-04-19 | 0000001 | 02 |
| 2017-04-19 | 0000001 | 03 |
| 2017-04-19 | 0000002 | 01 |
| 2017-04-19 | 0000002 | 02 |
| 2017-04-29 | 0000003 | 01 |
| 2017-04-29 | 0000003 | 02 |
| 2017-04-29 | 0000003 | 03 |
| 2017-04-29 | 0000004 | 01 |
| 2017-04-29 | 0000005 | 01 |
+------------+----------+---------------+
Optionally, if you are doing both of these operations at the same time you can do it in the same query using a derived table/subquery or common table expression with row_number()
;
;with cte as (
select date, Purchase, Line_Purchase
, rn = row_number() over (partition by Purchase,Line_Purchase order by date)
from t
--where date in ('2017-09-26','2017-09-16')
where date in (convert(date, getdate()), convert(date, getdate()-10))
)
select date as Input_date, Purchase, Line_Purchase
into #temptable
from cte
where rn = 1
select *
from #temptable;
rextester demo: http://rextester.com/QMF5992
returns:
+------------+----------+---------------+
| Input_date | Purchase | Line_Purchase |
+------------+----------+---------------+
| 2017-09-16 | 0000001 | 01 |
| 2017-09-16 | 0000001 | 02 |
| 2017-09-16 | 0000001 | 03 |
| 2017-09-16 | 0000002 | 01 |
| 2017-09-16 | 0000002 | 02 |
| 2017-09-26 | 0000003 | 01 |
| 2017-09-26 | 0000003 | 02 |
| 2017-09-26 | 0000003 | 03 |
| 2017-09-26 | 0000004 | 01 |
| 2017-09-26 | 0000005 | 01 |
+------------+----------+---------------+