Sorry for not many clear title.
1st table "place":
ID PLACE AREA_1 AREA_2 AREA_3
1 Mago 23 45 67
2 Gelato 23 45 12
And so on
2nd table "area_1"
ID ID_AREA_1 AREA_1
1 23 Lazio
3rd table "area_2"
ID ID_AREA_2 AREA_2
1 45 Roma
4th table "area_3"
ID ID_AREA_3 AREA_3
1 12 Roma
2 67 Velletri
Of course with 3 INNER JOIN I can extract in this mode
ID PLACE AREA_1_NAME AREA_2_NAME AREA_3_NAME
1 Mago Lazio Roma Velletri
But I need to re-factory the database, losing 2nd, 3rd and 4th table and I need to obtain a new, unique table directly with
ID PLACE AREA_1_NAME AREA_2_NAME AREA_3_NAME
1 Mago Lazio Roma Velletri
1) I need absolutely to mantain inalterate the ID (id of place) of the 1st table (are used in others tables that I will mantain)
2) I don't need anymore the 2nd, 3rd and 4th tables
Could you help me to create the SQL statement for MySQL to prattically move the result of the JOINS to a new table?
Thank you very, very much!
Related
First let me say that yes, this is a horrible way to have stored data, second, it isn't my fault :) I am trying to integrate with a 3rd party database to extract info which is stored in 3 tables, which really should have been in two AND stored where table 2 had a many to one relationship. Since that isn't the case, I have a puzzle to share.
Table one contains rows in which multiple values can be stored. Each row has codeid1-codeid20. These columns may contain a value, or a 0 (they are never null). They also have a corresponding codetype1-codetype20 which will be either 0 or 1.
If codetype1 is equal to 0, we go to table 2 and select description from the matching table1.codeid1=table2.id. If codetype1 equals 1, we now have to look at table3 and find where table1.codeid1=table3.id and then match table3.table2id=table2.id and return the description.
Here is the data structure:
table1
codeid1,codeid2,codeid3,...codeid20 ... codetype1,codetype2,codetype3,.....codetype20
18 13 1 33 0 0 1 1
13 21 45 0 0 1 0 0
table2
id, description
13 Item 13 Description
15 Item 15 Description
17 Item 17 Description
18 Item 18 Description
21 Item 21 Description
28 Item 28 Description
45 Item 45 Description
table3
id, table2id
1 15
33 17
21 28
The results I would be looking for would look like this:
rowid, description
1 Item 18 Description
1 Item 13 Description
1 Item 15 Description
1 Item 17 Description
2 Item 13 Description
2 Item 28 Description
2 Item 45 Description
I got started working with someone last night, but I had missed part of the complexity of my situation in not integrating table3. Like I said, fun puzzle... This gives me the relationship between the first 2 tables, but I am unsure how I can work in a 3rd table.
SELECT table1.rowid, table2.description
FROM table2
INNER JOIN table1
ON table2.id=table1.codeie1
OR table2.id=table1.codeie2
...
The database is a Faircom C-Tree DB over an ODBC connection, which is generally compatible with Mysql statements including UNION, WITH, INTERSECT, EXISTS, JOIN... There is no PIVOT function.
https://docs.faircom.com/doc/sqlref/sqlref.pdf
Perhaps it will work with or rather than in:
where exists (select 1
from table1 as t1
where t2.id = t1.codeid1 or
t2.id = t2.codeid2 or
. . .
);
I am pretty new to mysql and this site. I got an old mysql database (100.000 entries) to migrate to our new system. This is the old table:
CUSTOMER
Customer_ID Name Categories
1 Bob 1,2
2 Phil NULL
3 Ines 10,8
4 Carol 1
5 Rick 13,2
And i need the following structure:
CUSTOMER
Customer_ID Name
1 Bob
2 Phil
3 Ines
4 Carol
5 Rick
Category
Category_ID Category_Name
1 Biker
2 Doctors
3 Teacher
... ...
13 Drivers
CustomerHasCategory
Customer_ID Category_ID
1 1
1 2
3 10
3 8
4 1
5 13
5 2
Thanks for any help.
I also had this problem but not in MySQL. I solved it with Python using the Pandas library. So, the exact steps I followed won't be useful for you. However, I'll show you the general idea behind the solution I used.
Below is image of the original column
First, I splitted the text into columns using the comas as the delimiter.
Next, I 'stacked' the columns
Finally, I removed the artefact column(s). So, I have only the ID and the values columns. This creates a one-to-many relationship.
I am wondering if any of you would be able to help me. I am trying to loop through table 1 (which has duplicate values of the plant codes) and based on the unique plant codes, create a new record for the two other tables. For each unique Plant code I want to create a new row in the other two tables and regarding the non unique PtypeID I link any one of the PTypeID's for all inserts it doesnt matter which I choose and for the rest of the fields like name etc. I would like to set those myself, I am just stuck on the logic of how to insert based on looping through a certain table and adding to another. So here is the data:
Table 1
PlantCode PlantID PTypeID
MEX 1 10
USA 2 11
USA 2 12
AUS 3 13
CHL 4 14
Table 2
PTypeID PtypeName PRID
123 Supplier 1
23 General 2
45 Customer 3
90 Broker 4
90 Broker 5
Table 3
PCreatedDate PRID PRName
2005-03-21 14:44:27.157 1 Classification
2005-03-29 00:00:00.000 2 Follow Up
2005-04-13 09:27:17.720 3 Step 1
2005-04-13 10:31:37.680 4 Step 2
2005-04-13 10:32:17.663 5 General Process
Any help at all would be greatly appreciated
I'm unclear on what relationship there is between Table 1 and either of the other two, so this is going to be a bit general.
First, there are two options and both require a select statement to get the unique values of PlantCode out of table1, along with one of the PTypeId's associated with it, so let's do that:
select PlantCode, min(PTypeId)
from table1
group by PlantCode;
This gets the lowest valued PTypeId associated with the PlantCode. You could use max(PTypeId) instead which gets the highest value if you wanted: for 'USA' min will give you 11 and max will give you 12.
Having selected that data you can either write some code (C#, C++, java, whatever) to read through the results row by row and insert new data into table2 and table3. I'm not going to show that, but I'll show how the do it using pure SQL.
insert into table2 (PTypeId, PTypeName, PRID)
select PTypeId, 'YourChoiceOfName', 24 -- set PRID to 24 for all
from
(
select PlantCode, min(PTypeId) as PTypeId
from table1
group by PlantCode
) x;
and follow that with a similar insert.... select... for table3.
Hope that helps.
I have the following two tables:
1) Transactions Table
TID ID
---- --
1212 21
1313 31
1414 21
1515 44
1616 21
1717 31
2) Products Table
PID Count
--- -----
21 7
31 8
44 9
(Original counts value was 10)
I would like to achieve this: when ever I add a transaction in the transaction table, I want to be able to check if the product I'm trying to sell have sufficient quantity in the product table (1 or more) and if it does, allow the addition in the transaction table and decrease the count of the product in the product table.
I tried to do this by going to Table->After Add/After update.. etc. but with no help. Also didn't find resources on the web. I'm using Access 2013.
You actually need two (2) data macros on the [Transactions] table: a Before Change data macro to see if the transaction can be entered ...
... and an After Insert data macro to update the [Products] table:
Let's say I have a Text document. There are two columns. Column 1 contains a list of names while column contains a list of value relating to those names. The problem is column 1 may have same names repeating on different rows. This is not an error though.
For ex:
Frank Burton 13
Joe Donnigan 22
John Smith 45
Cooper White 53
Joe Donnigan 19
What are the ways to organize my data in a way that I would have column 1 with unique data names and column 2 with the values summed together relating column 1? What can I do if I have these data in excel?
For ex:
Frank Burton 13
Joe Donnigan 41
John Smith 45
Cooper White 53
Thanks a bunch!
In mySQL you could write a query similar to...
Select col1, Sum(col2) FROM TableName group by col1
In Excel you could use a pivot table to group the information together
Insert Pivot table, select range enter values as in image below.