Fill missing rows in dataset

Question

Fill missing rows in dataset

Ombir

Mr or Mrs. 500

Points: 526
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May 27, 2022 at 6:25 pm

#4040382

I have data in table like this.
I want to fill/insert the rows with missing quarters from 2019-Q1 to 2022-Q4 with Sales as 0 for missing quarters and rest of the dimensions as it is.
For example: West has only two rows of quarter 2019-Q1 AND 2020-Q3. I also need other 14 rows of remaining quarters between 2019-Q1 AND 2022-Q4.
Sample fiddle data set: https://www.db-fiddle.com/f/a819dNsKzdk8kXiYjkRNzz/2
Can some please help with sql code to achieve the same ?

Viewing 11 posts - 1 through 10 (of 10 total)

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ScottPletcher SSC Guru Points: 101078 More actions · Answer 1

;WITH cte_distinct_customer_regions AS (
    SELECT DISTINCT Customer_Key, Customer_Name, Component, Region
    FROM Fill_Gaps
)

SELECT 
    cdc.Customer_Key, cdc.Customer_Name, cdc.Component, cdc.Region,
    q.Quarter, ISNULL(fg.Sales, 0) AS Sales
FROM cte_distinct_customer_regions cdc
CROSS JOIN Quarters q
LEFT OUTER JOIN Fill_Gaps fg ON fg.Customer_Key = cdc.Customer_key AND fg.Region = cdc.Region AND fg.Quarter = q.Quarter
ORDER BY cdc.Customer_Name, q.Quarter

SQL DBA,SQL Server MVP(07, 08, 09) "It's a dog-eat-dog world, and I'm wearing Milk-Bone underwear." "Norm", on "Cheers". Also from "Cheers", from "Carla": "You need to know 3 things about Tortelli men: Tortelli men draw women like flies; Tortelli men treat women like flies; Tortelli men's brains are in their flies".

Jeff Moden SSC Guru Points: 1004290 More actions · Answer 2

@ombir ,

I know that the Fill_Gaps table is just a test table here. What value is returned when you run the following code against the real table?

   WITH cteUnique AS
(
 SELECT DISTINCT Customer_Key,Customer_Name,Component,Region
   FROM PutRealTableNameHre --<-----<<<<< LOOK!!! CHANGE THIS BEFORE YOU RUN IT!!!!
) 
 SELECT COUNT(*)
   FROM cteUnique
;

--Jeff Moden

RBAR is pronounced "ree-bar" and is a "Modenism" for Row-By-Agonizing-Row.
First step towards the paradigm shift of writing Set Based code:
________Stop thinking about what you want to do to a ROW... think, instead, of what you want to do to a COLUMN.

Change is inevitable... Change for the better is not.

Helpful Links:
How to post code problems
How to Post Performance Problems
Create a Tally Function (fnTally)

Ombir Mr or Mrs. 500 Points: 526 More actions · Answer 3

Ombir

Mr or Mrs. 500

Points: 526

May 28, 2022 at 2:50 am

#4040546

Thanks Scott. I will check this out.

Ombir Mr or Mrs. 500 Points: 526 More actions · Answer 4

Jeff Moden wrote:

@Ombir ,
I know that the Fill_Gaps table is just a test table here. What value is returned when you run the following code against the real table?
   WITH cteUnique AS
(
 SELECT DISTINCT Customer_Key,Customer_Name,Component,Region
   FROM PutRealTableNameHre --<-----<<<<< LOOK!!! CHANGE THIS BEFORE YOU RUN IT!!!!
) 
 SELECT COUNT(*)
   FROM cteUnique
;

Thanks Jeff for having a look. The count is 8,518,436.

Ombir Mr or Mrs. 500 Points: 526 More actions · Answer 5

Let me give more context on this. I am trying to identify if multiple components have been purchased by customers (Sales>0) in Last 4 quarters and then on basis of components purchased club the customer into 3 groups.

Group 1: Purchased Component 1 and Component 2 (Rolling 4 quarters)

Group 2: Purchased Component 1 and Component 3 (Rolling 4 quarters)

Group 3: Purchased All three components (Rolling 4 quarters)

Basically a customer can fall into Group 1 ,say in 2020-Q3 and then into Group 3 in 2021-Q1 and then into Group 2 in 2022-Q3. The group is decided on rolling sales in last 4 quarters at any point of time. I have generated another data set https://www.db-fiddle.com/f/neBPKhKbTu7cYgUwLf2naa/1 which is sufficient to generate all 3 groups. In my data if there is no sales in a quarter for component then that row isn't available.

Thats why I am trying to fill the missing quarters. May be there is direct solution which don't need to fill the gaps but I am not sure how to do it.

Jeff Moden SSC Guru Points: 1004290 More actions · Answer 6

Ombir wrote:

Let me give more context on this. I am trying to identify if multiple components have been purchased by customers (Sales>0) in Last 4 quarters and then on basis of components purchased club the customer into 3 groups.
Group 1: Purchased Component 1 and Component 2 (Rolling 4 quarters) Group 2: Purchased Component 1 and Component 3 (Rolling 4 quarters) Group 3: Purchased All three components (Rolling 4 quarters)
Basically a customer can fall into Group 1 ,say in 2020-Q3 and then into Group 3 in 2021-Q1 and then into Group 2 in 2022-Q3. The group is decided on rolling sales in last 4 quarters at any point of time. I have generated another data set https://www.db-fiddle.com/f/neBPKhKbTu7cYgUwLf2naa/1 which is sufficient to generate all 3 groups. In my data if there is no sales in a quarter for component then that row isn't available. Thats why I am trying to fill the missing quarters. May be there is direct solution which don't need to fill the gaps but I am not sure how to do it.

"Rolling 4 quarters"... from what date?

For example, always the previous 4 quarters not including the current quarter?

... or ...

From a given completed quarter?

... or ???

And what should the output look like?

AND, are the 3 rules for components 1, 2, and 3 fixed or variable and are there more than 3 components?

--Jeff Moden

RBAR is pronounced "ree-bar" and is a "Modenism" for Row-By-Agonizing-Row.
First step towards the paradigm shift of writing Set Based code:
________Stop thinking about what you want to do to a ROW... think, instead, of what you want to do to a COLUMN.

Change is inevitable... Change for the better is not.

Helpful Links:
How to post code problems
How to Post Performance Problems
Create a Tally Function (fnTally)

Ombir Mr or Mrs. 500 Points: 526 More actions · Answer 7

Jeff Moden wrote:

Ombir wrote:
Let me give more context on this. I am trying to identify if multiple components have been purchased by customers (Sales>0) in Last 4 quarters and then on basis of components purchased club the customer into 3 groups.
Group 1: Purchased Component 1 and Component 2 (Rolling 4 quarters) Group 2: Purchased Component 1 and Component 3 (Rolling 4 quarters) Group 3: Purchased All three components (Rolling 4 quarters)
Basically a customer can fall into Group 1 ,say in 2020-Q3 and then into Group 3 in 2021-Q1 and then into Group 2 in 2022-Q3. The group is decided on rolling sales in last 4 quarters at any point of time. I have generated another data set https://www.db-fiddle.com/f/neBPKhKbTu7cYgUwLf2naa/1 which is sufficient to generate all 3 groups. In my data if there is no sales in a quarter for component then that row isn't available. Thats why I am trying to fill the missing quarters. May be there is direct solution which don't need to fill the gaps but I am not sure how to do it.
"Rolling 4 quarters"... from what date?
For example, always the previous 4 quarters not including the current quarter?
... or ...
From a given completed quarter?
... or ???
And what should the output look like?
AND, are the 3 rules for components 1, 2, and 3 fixed or variable and are there more than 3 components?

Rolling 4 quarters include current quarter/row. For example, if we have to report the Sales for Group 1 for 2021-Q3, then we have to check if that customer has purchased both component 1 and 2 in any of last 4 quarters(2021-Q3,2021-Q2,2021-Q1,2020-Q4). If yes then in 2021-Q3, we report that customer under Group1 and whatever is sales in 2021-Q3 will add with other customers of similar Group 1. This grouping is mutually exclusive. Priority of Group 3 will be highest. If in any quarter if a customer falls into say both Group 1 and Group 3 then it will assigned to Group 3. Group 2 and 1 falls under same priority. In any quarter customer cannot falls into more than 1 Group.
Updated the fiddle with required Grouping column here https://www.db-fiddle.com/f/neBPKhKbTu7cYgUwLf2naa/3
Component is fixed at 3 types only. There can be one more category i.e Group 4. If a customer has purchased only Single component in any of the last 4 quarters.

This reply was modified 2 years, 5 months ago by Ombir.

Jeff Moden SSC Guru Points: 1004290 More actions · Answer 8

So, just to be sure, "Component N" and "Region" can actually be anything, correct? And the goal is to assign the "N" of "Group N"? Do the requirements of "Group N" change because "Component "N" changes?

For example, for one company, Components 1, 2, and 3 might be Pistons, Sawdust Pumps, and Cow Catchers while Components 1, 2, and 3 might be Seat Covers, Bum Warmers, and Back Scratchers for a different company?

And can the definitions of "Group" change?

--Jeff Moden

RBAR is pronounced "ree-bar" and is a "Modenism" for Row-By-Agonizing-Row.
First step towards the paradigm shift of writing Set Based code:
________Stop thinking about what you want to do to a ROW... think, instead, of what you want to do to a COLUMN.

Change is inevitable... Change for the better is not.

Helpful Links:
How to post code problems
How to Post Performance Problems
Create a Tally Function (fnTally)

Ombir Mr or Mrs. 500 Points: 526 More actions · Answer 9

Jeff Moden wrote:

So, just to be sure, "Component N" and "Region" can actually be anything, correct? And the goal is to assign the "N" of "Group N"? Do the requirements of "Group N" change because "Component "N" changes?
For example, for one company, Components 1, 2, and 3 might be Pistons, Sawdust Pumps, and Cow Catchers while Components 1, 2, and 3 might be Seat Covers, Bum Warmers, and Back Scratchers for a different company?
And can the definitions of "Group" change?

No. Components will be same (Fixed 3) for every company and definition of group will be also same.

Ombir Mr or Mrs. 500 Points: 526 More actions · Answer 10

Ombir

Mr or Mrs. 500

Points: 526

June 10, 2022 at 2:23 pm

#4047557

@jeff Any update on above ?