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Getting Data Out Of Multiple Tables And Join


I have two separate querys, but what I want to do is make one query from it. To get data from different tables. Code:




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I have spent more than 24 hours now just trying to build a query to extract data from multiple tables (which are a bit typical) in the format I need but in vain and I am goin MAD now . Any help would be really apprecaited.

I have 5 tables: items, table1, table2, table3, and table4

table1, table2, table3, and table4 have got 368 columns each (366 representing each day of a year plus two additional columns - see below in structures)

structures are as follows:

items: ITEMID, TITLE, DESC ...

table1: ITEMID P1JAN01, P1JAN02, ... P1JAN31, P1FEB01, P1FEB02, ...P1FEB29 ... P1DEC01, P1DEC02 ... P1DEC31, YEAR

table2: ITEMID P2JAN01, P2JAN02, ... P2JAN31, P2FEB01, P2FEB02, ...P2FEB29 ... P2DEC01, P2DEC02 ... P2DEC31, YEAR

table3: ITEMID P3JAN01, P3JAN02, ... P3JAN31, P3FEB01, P3FEB02, ...P3FEB29 ... P3DEC01, P3DEC02 ... P3DEC31, YEAR

table4: ITEMID P4JAN01, P4JAN02, ... P4JAN31, P4FEB01, P4FEB02, ...P4FEB29 ... P4DEC01, P4DEC02 ... P4DEC31, YEAR

Yes they are funny but that's the way they are.

Note: Please note the month names within the column names

Now I need to select SUM of a given month (say JAN) for a particular ITEMID from each of the tables for a given year (say 2006)

for SUM i am using:


PHP

$p1 = "P1JAN01 + P1JAN02 + P1JAN03 + ... P1DEC31"
$p2 = "P2JAN01 + P2JAN02 + P2JAN03 + ... P2DEC31"
$p3 = "P3JAN01 + P3JAN02 + P3JAN03 + ... P3DEC31"
$p4 = "P4JAN01 + P4JAN02 + P4JAN03 + ... P4DEC31"

and then

SELECT $p1, $p2, $p3, $p4 ...


A basic query that I first tried was:


PHP

SELECT
$p1 AS P1,
$p2 AS P2,
$p3 AS P3,
$p4 AS P4
FROM items
LEFT JOIN table1 on table1.ITEMID = items.ITEMID
LEFT JOIN table2 on table2.ITEMID = items.ITEMID
LEFT JOIN table3 on table3.ITEMID = items.ITEMID
LEFT JOIN table4 on table4.ITEMID = items.ITEMID

WHERE

table1.YEAR = 2006 &&
table2.YEAR = 2006 &&
table3.YEAR = 2006 &&
table4.YEAR = 2006


This acts very funny...fetches me only the results which have got entries in all the tables. If there's no entry in any of the tables for a given item then that item is not fetched at all.

The result set i need is something like this

PHP

ITEMID        P1      P2       P3        P4
1            NULL     56       63      NULL
2             36        0     1253     63
3            NULL    NULL     NULL     NULL


and so on...

and these all must be for a given year

I tried playing around with the query with different joins and work arounds but no use. I really need this done soon. I'll be really thankful if you can suggest me anythig that can get me the result set i need. Please let me know if I am not clear anywhere.



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I have a database with quite a lot of tables all with foreign keys of each other. One of the tables has a one to many relationship (it being the one) with two tables, but it only uses one of them for any one record. Which one is used depends on a field in the main table. This essentially defines three different types of the same item, which has mostly the same fields, but two of them also require additional, multiple record (hence the one to many) information. So the table has a field 'type' which takes the value 1 (in which case no other table is referenced), 2, (in which case the first other table is used) and 3 (in which the other table is used).

What I would ideally like to do is have one SQL query which returns information (from the main table) about any record which applies to the day (as it is part of a calendar system) specified in the query. The problem is that to decide if the record is relivent, the query must look through at most two of the three tables. I doubt that there is a way to specify in an SQL query to join to a table depending on the field of the first, and to join all three and perform the query could produce unexpected results if there were for any reason records in the third which referred to the first table. I could do this with several queries, but it would probably be more efficient to do it by one query. Would I be able to do an outer join on this?

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JOIN Across Multiple Keys In The Same Row
I have a table where each row has multiple foreign keys. What I'd like to do is a JOIN where each row of the returned resultant table contains all the data from each table that each row points to.

For example, say there are 2 tables, MainTable and SecondaryTable. MainTable has 2 columns, each of which use a foreign key to point to records in the SecondaryTable like so: ......

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Multiple Inner Join Within The Same Table
I want to create a new table from an image table where the columns would be the image_path where image_type =1 and image_type=2 for images with the same slide_id. I used the following query with an error:

select slide_id, image_path as thumb_path from image as thumb where thumb.image_type=1 inner join image.image_path on image.slide_id=thumb.slide_id where image.image_type=2;

Below is the image table:
image
image_idslide_idimage_typeimage_path
111/Image/full.jpg
212/Image/thumb.jpg
321/Image/full.jpg
422/Image/thumb.jpg
531/Image/full.jpg
632/Image/thumb.jpg
741/Image/full.jpg
842/Image/thumb.jpg

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Multiple Table Join
I am using MYSQL version 3.23.58-16.FC2.1 which has caused me issues in the past. However everything is working so its the old addage if it aint broke...dont fix it.

anyway heres the situation,

I have three tables clients that have multiple properties and those multiple properties have multiple payments against them. I am trying to list a monthly statement per client, per property, of payments to look something like this :-

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Multiple JOIN Problem
I have tables: gallery_album, gallery_photo, node.

On node, the important columns are: type (type must be "gallery"), nid (integer node id), uid - node owner id.

On gallery_photo, the important colums are: nid (relates photo to node entry), album_id - relates photos to gallery_album entries.

On gallery_album, the important colums are: id (must match album_id in gallery_photo), title, must not be empty (check for <> "" does the trick), owner_id

For every node entry of type "gallery" there exists exactly one entry in gallery_photos - one to one relationship.

For every gallery_album entry there exists any number of gallery_photo and node entries - one to many relationship.

I know the user id, I need to return albums belonging to that user together with photo count in that album and newest photo from that album (specified by nid and node.created timestamp).

If album has 0 entries, I still need it!

The problem is that I need to LEFT JOIN (right?) TWO tables (gallery_photo, nodes) on ONE (gallery_album), how do I do that?


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Multiple Batabases Vs. Multiple Tables
I am about migrate from an old program database to MySql (Running under RH
LINUX)and I'm wondering which is the best option to do :

I currently have one file for each of my modules, (I'm using filepro plus) ,
so like CUSTOMER, WARRANTY, ZIPCODES, INV, etc... like 2,000 files each with
their own fields.

1) Should I create multiple databases on MySQL

2) Should I create a single database on MySql and with multiple tables ?

Which one of these options is the best and more safer ?

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Multiple Databases Or Multiple Tables
I have an application that is supposed to make multiple connections [around 10 connections per second] to a mysql database. The connections are done by mutlitple users at potentially the same time.

I have to decide if I should use :

1)one database with one table for all users.
2)one database for each user.
3)one database with one table for each user.

I would really appreciate if you can tell me what choice is best and why.

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Join Multiple Rows / Group By
I have 2 tables.

table.users
------
userID (primary)
username

table.userEntries
------
entryID (primary)
userID
favorite_color
favorite_game
favorite_shoe

and the data might like something like this .....

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