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> Appending Query Multiplies Data, Access 2010    
 
   
Chrismeli
post Jun 22 2019, 09:45 PM
Post#1



Posts: 8
Joined: 30-May 19



Hello!
I am trying to build a database which will consist of 3 tables and many more Queries which will randomly allocate police officers to the required , for the day, duties.
I am in a police department in Athens Greece which has more than 250 officers and currently there are 8 people trying to allocate everyone daily according to a book they keep everyone on.
Now what i did is i created 3 tables as you can see and the problem I face is that the appending query i want to use, so each and every police offer is allocated randomly to each post, gets multiplied by the data that the tableb has and does not combine them to give me the results i want

More specifically we have :

```
TABLEA
ID | POLICE RANK | FULL NAME |
____________________________________
288066 | Const. | Chris Meli |
273111 | Serg. | John Do |
231444 | Const. | Bill Park |
298432 | Const. | Joe Park |
_____________________________________
```
which contains the info of the police officers and is connected to the ID field in TableC so even from the connection on TableA you can examine the duties every officer has been assigned to the previous days.

```
TABLEB

DUTY | Number of Police needed |
| for each service |
____________________________________
Patrol | 1 |
Guards| 1 |
Courts | 2 |
____________________________________
```

I put the number 1 and 2 just for the sake of simplicity. Normally TableA will contain *more than 250 people* and on *TableB will be many Duties and the number of police needed will vary depending on the date and many other factors.

```
TABLEC
ID | DUTY | DATE |
____________________________________
.......|.................| ................|
.......|.................| ................|
.........|.................| ................|
.........|.................| ................|
_____________________________________
```
TableC will be populated From TableA (ID),TableB (Duty) and an input for the date i will be scheduling with the following appending query

```
INSERT INTO TABLEC ( DUTY, DATE, ID )
SELECT TABLEB.DUTY, [INPUT DATE], TABLEA.ID
FROM TABLEA, TABLEB INNER JOIN n ON n.n <= TABLEB.[Number of Police needed for each service];
```
(n is a numbers table and n.n is a column that has like 10000 numbers so don't pay attention to that)
Now the appending query returns me the results i need but what happens is , it kind of multiplies the position needed with the officer's ID . So instead of having this:

```
TABLEC
ID | DUTY | DATE |
____________________________________
288066 | Patrol | 23/06/2019 |
273111 | Guards | 23/06/2019 |
231444 | Courts | 23/06/2019 |
298432 | Courts | 23/06/2019 |
_____________________________________
```
I have this:
```
TABLEC
ID | DUTY | DATE |
____________________________________
288066 | Patrol | 23/06/2019 |
288066 | Guards | 23/06/2019 |
288066 | Courts | 23/06/2019 |
288066 | Courts | 23/06/2019 |
273111 | Patrol | 23/06/2019 |
273111 | Guards | 23/06/2019 |
273111 | Courts | 23/06/2019 |
273111 | Courts | 23/06/2019 |
231444 | Patrol | 23/06/2019 |
231444 | Guards | 23/06/2019 |
231444 | Courts | 23/06/2019 |
231444 | Courts | 23/06/2019 |
298432 | Patrol | 23/06/2019 |
298432 | Guards | 23/06/2019 |
298432 | Courts | 23/06/2019 |
298432 | Courts | 23/06/2019 |
_____________________________________
```
Is there a way to connect TableA.ID and TableB.DUTY without being multiplied automatically?at
I appreciate any input. I asked the same question at stackoverflow and someone prompted me to search for inner and left joins. I have looked everywhere but still cant figure it out!
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theDBguy
post Jun 22 2019, 10:44 PM
Post#2


Access Wiki and Forums Moderator
Posts: 75,729
Joined: 19-June 07
From: SunnySandyEggo


Hi Chris,

Welcome to UtterAccess!
welcome2UA.gif

The reason why your data is being multiplied is, I think, because you’re using a Cartesian product in your query. This happens when you don’t specify a join type.

--------------------
Just my 2 cents... "And if I claim to be a wise man, it surely means that I don't know" - Kansas
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Chrismeli
post Jun 22 2019, 11:04 PM
Post#3



Posts: 8
Joined: 30-May 19



Haha hey man! You re the one that greeted me on the other forum as well! Aren't you?
I have been trying all night to put a left join to the TableA and I looked in like 50 related posts but I get an error either Join error or from :/
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theDBguy
post Jun 23 2019, 08:48 AM
Post#4


Access Wiki and Forums Moderator
Posts: 75,729
Joined: 19-June 07
From: SunnySandyEggo


Hi Chris. Yes that was me. Can you post a sample copy of your db with test data either here or the other forum, so we can take a look?

--------------------
Just my 2 cents... "And if I claim to be a wise man, it surely means that I don't know" - Kansas
Access Website | Access Blog | Email
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Chrismeli
post Jun 23 2019, 10:10 AM
Post#5



Posts: 8
Joined: 30-May 19



Right Away sorry for the Delay

ΠΡΟΣΩΠΙΚΟ is TABLEA (consists of the details of "all" the police officers)

ΟΜΑΔΕΣ is TABLEB ( which consist of all the duties probably needed to be assigned along with number of officers required for each duty (could be one or could be 10. That depends)

[ΚΑΘΗΜΕΡΙΝΕΣ ΥΠΗΡΕΣΙΕΣ] is TABLEC (table where duties and ids will be imported )

ΤΥΧΑΙΑ ΑΝΑΚΑΤΑΝΟΜΗ is a query that put the Records from TableA in a random Sequence ( i want to use that so every duty is assigned randomly to the officers, will put some more criteria later) (I think that's where i take the data from in the following appending query and not from TableA [ΠΡΟΣΩΠΙΚΟ])

[ΥΠΗΡΕΣΙΑ ΓΙΑ ΕΠΟΜΕΝΗ ΜΕΡΑ /ΑΝΑΓΚΕΣ ΚΑΙ ΑΤΟΜΑ] is the appending query that unfortunately multiply the data from |TableB| with the data from |TableA|
What i want though is that the field ID from [ΠΡΟΣΩΠΙΚΟ] or the query [ΑΝΑΚΑΤΑΝΟΜΗ] and duties from [ΚΑΘΗΜΕΡΙΝΗ ΥΠΗΡΕΣΙΑ] are matched with each other.
This is where my problem is.
Instead of allocating one duty to a random officer , every officer is allocated to all duties.
So we want TableC [ΚΑΘΗΜΕΡΙΝΕΣ ΥΠΗΡΕΣΙΕΣ] to be populated by just four duties along with just ONE ID of the officer being allocated, but instead it gets 16 duties because every duty is assigned to all officers 4 [duties needed] * 4 [ids] = 16 [records] While it had to be 4 [duties] * 1[ID for every duty] = 4 [records] On tableC



[ΑΝΑΓΚΕΣ ΥΠΗΡΕΣΙΑΣ ΓΙΑ ΕΠΟΜΕΝΗ ΜΕΡΑ ΜΕ ΠΑΡΑΛΛΗΛΗ ΠΡΟΣΘΗΚΗ] is an other query there that just takes the data from TABLEB (the duties and the number of person that are needed for each duty) and appends them on |TableC|. This works just fine.

N Table is just a tally table i use to join with TableB so i can populate [TableC] with the needed numbers.

I am really sorry that all the tables and fields are in Greek but i designed it so almost everyone from my work can use it!! Thank you for helping me out!
IF you have any troubles with the language on that please let me know!


By the way the input that will be popping up if you run the appending query [ΥΠΗΡΕΣΙΑ ΓΙΑ ΕΠΟΜΕΝΗ ΜΕΡΑ /ΑΝΑΓΚΕΣ ΚΑΙ ΑΤΟΜΑ] is a date input with the form of 23/06/2019 dd/mm/yyyy and will append the date into TableC

This post has been edited by Chrismeli: Jun 23 2019, 10:35 AM
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theDBguy
post Jun 23 2019, 10:27 AM
Post#6


Access Wiki and Forums Moderator
Posts: 75,729
Joined: 19-June 07
From: SunnySandyEggo


Hi. Unfortunately, for some reason, my computer cannot open the zipped file.
Attached File  zip.png ( 5.85K )Number of downloads: 0

--------------------
Just my 2 cents... "And if I claim to be a wise man, it surely means that I don't know" - Kansas
Access Website | Access Blog | Email
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Chrismeli
post Jun 23 2019, 10:37 AM
Post#7



Posts: 8
Joined: 30-May 19



Sorry!! I am downloading zip . It was rar but i changed it by force :/
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Chrismeli
post Jun 23 2019, 10:41 AM
Post#8



Posts: 8
Joined: 30-May 19



Here[attachment=90689:DBPOLIC.zip]
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GroverParkGeorge
post Jun 23 2019, 10:44 AM
Post#9


UA Admin
Posts: 35,318
Joined: 20-June 02
From: Newcastle, WA


Just an FYI. Changing the extension of a file doesn't change its structure. So renaming a file from XXXX.RAR to XXXX.ZIP doesn't make it a zipped file FORMAT.

To create a ZIP file, you need to use a tool that creates ZIP files.


--------------------
My Real Name Is George. Grover Park Consulting is where I do business.
How to Ask a Good Question
Beginning SQL Server
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Chrismeli
post Jun 23 2019, 10:47 AM
Post#10



Posts: 8
Joined: 30-May 19



Yeah i know, in my head it was going to work! Downloaded zip though and uploaded a valid copy!
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Chrismeli
post Jun 23 2019, 02:34 PM
Post#11



Posts: 8
Joined: 30-May 19



Please if you think that is quite complex and i should do it with an other way let me know!
I would greatly appreciate it!
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Chrismeli
post Jun 24 2019, 02:30 PM
Post#12



Posts: 8
Joined: 30-May 19



In English as well! Thank you in advance!
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theDBguy
post Jun 24 2019, 03:15 PM
Post#13


Access Wiki and Forums Moderator
Posts: 75,729
Joined: 19-June 07
From: SunnySandyEggo


Hi Chris. I posted a question in the other thread. Thank you.

--------------------
Just my 2 cents... "And if I claim to be a wise man, it surely means that I don't know" - Kansas
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