SQL date merge

[rajd1]

Hi all,

Here is my data. Data A has ID with different lines with start and end dates.

ID	LINE	LOSTART	LOEND
1	4	11/27/2017	1/17/2018
1	1	12/1/2015	4/1/2016
1	2	4/5/2016	8/16/2016
1	3	8/23/2016	11/14/2016
2	1	6/4/2016	9/18/2016
2	2	9/19/2016	11/11/2016
3	2	5/6/2016	7/17/2016
3	3	7/18/2016	10/3/2016
4	1	11/2/2015	5/30/2016
4	2	5/31/2016	12/28/2016
4	3	4/8/2018	1/9/2019
5	1	4/3/2015	6/4/2015
5	2	6/5/2015	12/27/2015
5	3	8/5/2016	9/7/2016
6	1	10/12/2015	6/2/2016
6	4	11/7/2016	4/20/2017
6	2	6/3/2016	8/27/2016
7	1	6/5/2016	6/15/2016

Here is data B:

ID	Order
1	7/16/2016
1	10/2/2017
2	7/18/2016
3	7/18/2016
4	7/26/2016
5	7/31/2016
6	7/31/2016
7	5/10/2016

The end result table is below. I am looking for the line by the order date.

The rule for the line variable is as follows:

Line = the order date is in between LOstart and LOend; This is pretty straight forward. For example: ID#1 row 1: Line 2 falls between LOstart and  LOend. i.e. 7/16/2016 falls between 4/5/2016 and 8/16/2016

When order date is not in between LOstart and LOend, then Line = before the start of next line. For example: ID#1 row 2: order date 10/2/2017 is considered line 3 because it occurs before the beginning of line 4 LOstart date of 11/27/2018.

Similarly with ID#5 order date is 7/31/2016 is considered line 2 because it occurs before the beginning of line 3 LOstart date of 8/5/2016

Finally for only 1 order and if this order occurs before LINE 1 then it is considered 0. For Example: ID#7 row 8: Line is considered 0 because the order date of 5/10/2016 occurs before LOSTART date of 6/5/2016.

I tried using SQL and only could get partial results. 

Row	ID	Order	LINE
1	1	7/16/2016	2
2	1	10/2/2017	3
3	2	7/18/2016	1
4	3	7/18/2016	3
5	4	7/26/2016	2
6	5	7/31/2016	2
7	6	7/31/2016	2
8	7	5/10/2016	0

Thanks a ton!

[novinosrin]

Finally for only 1 order and if this order occurs before LINE 1 then it is considered 0. For Example: ID#7 row 8: Line is considered 0 because the order date of 5/10/2016 occurs before LOSTART date of 6/5/2016?where is this in Data B?

[rajd1]

Yes sir, its the last row in data set B.

[rajd1]

Yes, for some reason the row was missing but i edited it. Thanks

[novinosrin]

Hi @rajd1  Alright no worries. Please try and test properly as I didn't for the reason I'm extremely tired and am about to doze off. If it doesnt work, Iet me know. I shall try and fix it tomoorow. Oh hey, in any case somebody else would have answered before I wake. Good night from CT

data a;
input ID	LINE	(LOSTART	LOEND) (:mmddyy10.);
format 	LOSTART	LOEND mmddyy10.;
cards;
1	4	11/27/2017	1/17/2018
1	1	12/1/2015	4/1/2016
1	2	4/5/2016	8/16/2016
1	3	8/23/2016	11/14/2016
2	1	6/4/2016	9/18/2016
2	2	9/19/2016	11/11/2016
3	2	5/6/2016	7/17/2016
3	3	7/18/2016	10/3/2016
4	1	11/2/2015	5/30/2016
4	2	5/31/2016	12/28/2016
4	3	4/8/2018	1/9/2019
5	1	4/3/2015	6/4/2015
5	2	6/5/2015	12/27/2015
5	3	8/5/2016	9/7/2016
6	1	10/12/2015	6/2/2016
6	4	11/7/2016	4/20/2017
6	2	6/3/2016	8/27/2016
7	1	6/5/2016	6/15/2016
;

data b;
input ID	Order :mmddyy10.;
format order mmddyy10.;
cards;
1	7/16/2016
1	10/2/2017
2	7/18/2016
3	7/18/2016
4	7/26/2016
5	7/31/2016
6	7/31/2016
7	5/10/2016
;
proc sql;
create table want as
select b.* , ifn(max(line)=1 and order<lostart,0,line) as line
from b b left join a a
on a.id=b.id and (LOSTART<=order<=LOEND or LOSTART>order)
group by a.id,order 
having 	LOSTART<=order<=LOEND or 
^max(LOSTART<=order<=LOEND) and min(lostart)=lostart
order by a.id,order;
quit;

[rajd1]

Hi @novinosrin , Thanks for this. Just a subtle change that i was looking for:

When order date is not in between LOstart and LOend, then Line = before the start of next line. For example: ID#1 row 2: order date 10/2/2017 is considered line 3 because it occurs before the beginning of line 4 LOstart date of 11/27/2018.

Similarly with ID#5 order date is 7/31/2016 is considered line 2 because it occurs before the beginning of line 3 LOstart date of 8/5/2016

[novinosrin]

Hi @rajd1  Good afternoon. I guess there is some problem in the communication or perhaps I am just lacking the comprehension skill. Let's do in piecemeal-

1. Once you JOIN/LOOK UP using self join, the sql processor see's this in-memory. The true flag =1 denotes the order falls between lostart and loend. So for these ID,Order combinations, it's easy to filter i.e. where true_flag=1. And for those cases, where it isn't true, your statement line= before the start of next line- is kinda confusing. Please explain the comparsion for ID1 10/02/2017 from the below

ID	Order	LINE	True_Flag	LOSTART	LOEND
1	07/16/2016	1	0	12/01/2015	04/01/2016
1	07/16/2016	2	1	04/05/2016	08/16/2016
1	07/16/2016	3	0	08/23/2016	11/14/2016
1	07/16/2016	4	0	11/27/2017	01/17/2018
1	10/02/2017	1	0	12/01/2015	04/01/2016
1	10/02/2017	2	0	04/05/2016	08/16/2016
1	10/02/2017	3	0	08/23/2016	11/14/2016
1	10/02/2017	4	0	11/27/2017	01/17/2018
2	07/18/2016	1	1	06/04/2016	09/18/2016
2	07/18/2016	2	0	09/19/2016	11/11/2016
3	07/18/2016	2	0	05/06/2016	07/17/2016
3	07/18/2016	3	1	07/18/2016	10/03/2016
4	07/26/2016	1	0	11/02/2015	05/30/2016
4	07/26/2016	2	1	05/31/2016	12/28/2016
4	07/26/2016	3	0	04/08/2018	01/09/2019
5	07/31/2016	1	0	04/03/2015	06/04/2015
5	07/31/2016	2	0	06/05/2015	12/27/2015
5	07/31/2016	3	0	08/05/2016	09/07/2016
6	07/31/2016	1	0	10/12/2015	06/02/2016
6	07/31/2016	2	1	06/03/2016	08/27/2016
6	07/31/2016	4	0	11/07/2016	04/20/2017
7	05/10/2016	1	0	06/05/2016	06/15/2016

[rajd1]

Good afternoon,
This is great! Hope i explain this better this time. The first rule between dates is good
So, say for ID#1 orderdate= 10/02/2017 will be Line = 3; It falls between line 3 LOEND 11/14/2016 and line 4 LOSTART 11/27/2017 and is still considered line 3.
Again, for ID#5, orderdate = 7/31/2016 will be line 2; it falls between line 2 LOEND 12/27/2015 and line 3 LOSTART 08.05/2016 and is still considered line 2.
You had this in the solution and it works great: If order occurs before LINE 1 then it is considered 0. For Example: ID#7 row 8: Line is considered 0 because the order date of 5/10/2016 occurs before LOSTART date of 6/5/2016.
I have the final solution below.

ID	Order	LINE
1	7/16/2016	2
1	10/2/2017	3
2	7/18/2016	1
3	7/18/2016	3
4	7/26/2016	2
5	7/31/2016	2
6	7/31/2016	2
7	5/10/2016	0

[novinosrin]

Much better Sir @rajd1 .  lol. Thank you!!!. Hmm, you "have"-'I have the final solution below.'

Do you still want the solution or you have done writing it?

[rajd1]

@novinosrin Can I please get your modified code? Thank you sir 🙂

[novinosrin · Accepted solution]

Okay @rajd1  Keeping it simple-

data a;
input ID	LINE	(LOSTART	LOEND) (:mmddyy10.);
format 	LOSTART	LOEND mmddyy10.;
cards;
1	4	11/27/2017	1/17/2018
1	1	12/1/2015	4/1/2016
1	2	4/5/2016	8/16/2016
1	3	8/23/2016	11/14/2016
2	1	6/4/2016	9/18/2016
2	2	9/19/2016	11/11/2016
3	2	5/6/2016	7/17/2016
3	3	7/18/2016	10/3/2016
4	1	11/2/2015	5/30/2016
4	2	5/31/2016	12/28/2016
4	3	4/8/2018	1/9/2019
5	1	4/3/2015	6/4/2015
5	2	6/5/2015	12/27/2015
5	3	8/5/2016	9/7/2016
6	1	10/12/2015	6/2/2016
6	4	11/7/2016	4/20/2017
6	2	6/3/2016	8/27/2016
7	1	6/5/2016	6/15/2016
;

data b;
input ID	Order :mmddyy10.;
format order mmddyy10.;
cards;
1	7/16/2016
1	10/2/2017
2	7/18/2016
3	7/18/2016
4	7/26/2016
5	7/31/2016
6	7/31/2016
7	5/10/2016
;

proc sql;
create table temp(drop=_True_Flag) as
select b.id,order,max(LOSTART<=order<=LOEND) as _True_Flag,line,
min(ifn(lostart>order,line,.))-1 as _line
from b b left join a a
on a.id=b.id 
group by a.id,order 
having _True_Flag and LOSTART<=order<=LOEND
or (not _True_Flag and _line=line)
or (line=1 and _line=0 and not _True_Flag)
order by a.id,order,line;
quit;

data want;
 set temp;
 if line=1 and _line=0 then line=_line;
 drop _line;
run;

ID Order LINE 
1 07/16/2016 2 
1 10/02/2017 3 
2 07/18/2016 1 
3 07/18/2016 3 
4 07/26/2016 2 
5 07/31/2016 2 
6 07/31/2016 2 
7 05/10/2016 0 

[rajd1]

Works fantastic , thanks a lot

[Eigth_Below]

The rule for ID#5 as well as ID#1 row2, so is the line of ID#5  line 3？I am not sure that I understood what you said. Here is my code.

proc sort data=a ;
by id lostart;
run;

data a1;
set a;
by id lostart;
lostart1=lag(loend)+1;
if first.id then lostart1=lostart;
format lagstdat mmddyy10.;
run;

proc sql;
create table b1 as
select b.id,b.order
,case when not missing(a.line) then a.line
else 0
end as line
from b
left join a1 as a
on b.id=a.id and b.order between a.lostart1 and a.loend
order by b.id,b.order
;
quit;

[rajd1]

Hi, This works great.
I need a subtle change:
When order date is not in between LOstart and LOend, then Line = before the start of next line. For example: ID#1 row 2: order date 10/2/2017 is considered line 3 because it occurs before the beginning of line 4 LOstart date of 11/27/2018.

Similarly with ID#5 order date is 7/31/2016 is considered line 2 because it occurs before the beginning of line 3 LOstart date of 8/5/2016

[Kurt_Bremser]

According to your rule, the result for ID 5 should be 3, not 2. Please revise your intended result.