I hope you can help me with this problem: I have three tables, similar to this:
ORDER
Order_ID | Order_Date
=====================
1 | 01/01/2001
2 | 02/01/2001
3 | 03/01/2001
4 | 04/01/2001
5 | 05/01/2001
ORDER_DETAIL
Order_Detail_ID | Order_ID | Status_ID
======================================
1 | 1 | 1
2 | 1 | 1
3 | 1 | 2
4 | 2 | 2
5 | 2 | 3
6 | 3 | 3
7 | 3 | 3
STATUS
Status_ID | Status_Name | Status_Priority
=========================================
1 | PENDING | 3
2 | COMPLETED | 2
3 | CANCELLED | 1
Now, as I suppose it shows, each row in the ORDER_DETAIL table is related to the ORDER table using Order_ID, and it also has a status indicated by the Status_ID. Also, the STATUS table has a Status_Priority column. What I need to do is show each order, along with, among other columns, the status with highest priority among the order details each order has, like this:
Order_ID | Order_Date | Status_Name
===================================
1 | 01/01/2001 | PENDING
2 | 02/01/2001 | COMPLETED
3 | 03/01/2001 | CANCELLED
4 | 04/01/2001 |
5 | 05/01/2001 |
In this case, for example, since Order_ID 1 has at least 1 Order_Detail_ID with the PENDING status, which has the highest priority among the details it has, that's the one that appears. I tried using a JOIN with a subquery, based on a similar code I have, but I can't seem to adapt it to this case. Any help will be much appreciated. Thanks in advance.
Select columns, join tables by order_id, order by Status_Priority
Related
i need a SQL-Query to delete duplicates from a table. Lets start with my tables
rc_document: (there are more entries, this is just an example)
+----------------+-------------+----------------------+
| rc_document_id | document_id | rc_document_group_id |
+----------------+-------------+----------------------+
| 1 | 1 | 1 |
| 2 | 2 | 1 |
| 3 | 3 | 1 |
| 4 | 4 | 1 |
| 5 | 1 | 2 |
| 6 | 3 | 2 |
+----------------+-------------+----------------------+
(document_id can be exists in mulitple rc_document-group´s)
rc_document_group:
+----------------------+----------+
| rc_document_group_id | priority |
+----------------------+----------+
| 1 | 1 |
| 2 | 2 |
+----------------------+----------+
Each rc_document can be joined with the rc_document_group. In the rc_document_group is the priority for each rc_document.
I want to delete the rc_document rows with document_id which have not the highest priority in the rc_document_group. Because the document_id can be exists in multiple rc_document-group´s .. i just want to keep that one, with the highest priority.
here is my expected rc_document table after deleting duplicate document_id´s:
+----------------+-------------+----------------------+
| rc_document_id | document_id | rc_document_group_id |
+----------------+-------------+----------------------+
| 2 | 2 | 1 |
| 4 | 4 | 1 |
| 5 | 1 | 2 |
| 6 | 3 | 2 |
+----------------+-------------+----------------------+
the rc_document´s with rc_document_id 1 and 3 must be deleted, because there document_id 1 and 3 are in another rc_document_group with higher priority.
Im new in sql and i have no idea how to write these sql query ... thank for your help!!
First, you could join the two tables in order to get the corresponding priority on each row. After that, you could use the analytic function MAX() to get, for each row, the max priority within each group of document_id. At this point, you filter out the rows where the priority is not equal to the max priority in the group.
Try this query:
SELECT t.rc_document_id,
t.document_id,
t.rc_document_group_id
FROM (SELECT d.*,
g.priority,
MAX(g.priority) OVER(PARTITION BY document_id) max_priority
FROM rc_document d
INNER JOIN rc_document_group g
ON d.rc_document_group_id = g.rc_document_group_id) t
WHERE t.priority = t.max_priority
I have three tables:
// priorities // statuses // projects
+----+--------+ +----+-------------+ +----+------+--------+----------+
| ID | NAME | | ID | STATUS NAME | | ID | NAME | STATUS | PRIORITY |
+----+--------+ +----+-------------+ +----+------+--------+----------+
| 1 | Normal | | 1 | Pending | | 1 | a | 1 | 3 |
+----+--------+ +----+-------------+ +----+------+--------+----------+
| 2 | High | | 2 | In Progress | | 2 | b | 1 | 1 |
+----+--------+ +----+-------------+ +----+------+--------+----------+
| 3 | Urgent | | 3 | c | 2 | 1 |
+----+--------+ +----+------+--------+----------+
| 4 | d | 1 | 2 |
+----+------+--------+----------+
I need to create a view that shows how many projects hold a status of 1 and a priority of 1, how many hold a status of 1 and a priority of 2, how many hold a status of 1 and a priority of 3, and so on.
This should go through each status, then each priority, then count the projects that apply to the criteria.
The view should hold values something like this:
// VIEW (stats)
+--------+----------+-------+
| STATUS | PRIORITY | COUNT |
+--------+----------+-------+
| 1 | 1 | 1 |
+--------+----------+-------+
| 1 | 2 | 1 |
+--------+----------+-------+
| 1 | 3 | 1 |
+--------+----------+-------+
| 2 | 1 | 1 |
+--------+----------+-------+
| 2 | 2 | 0 |
+--------+----------+-------+
| 2 | 3 | 0 |
+--------+----------+-------+
This view is so that I can call, for example, how many projects have a status of 1 and a priority of 3, the answer given the data above should be 1.
Using the below select statement I've been able to produce a similar result but it does not explicitly show that 0 projects have a status of 2 and a priority of 3. I need this 0 value to be accessible the same way as any of the others with a COUNT >= 1.
// my current select statement
CREATE VIEW stats
AS
SELECT P.STATUS, P.PRIORITY, COUNT(*) AS hits
FROM projects P
GROUP BY P.STATUS, P.PRIORITY
// does not show rows where COUNT = 0
How could I create a VIEW that holds all of the priorities' ids, all of the statuses' ids, and 0 values for COUNT?
You need to generate all the rows and then get the count for each one. Here is a query that should work:
SELECT s.status, p.priority, COUNT(pr.status) AS hits
FROM (SELECT DISTINCT status FROM projects) s CROSS JOIN
(SELECT DISTINCT priority FROM projects) p LEFT JOIN
project pr
ON pr.status = s.status and pr.priority = p.priority
GROUP BY s.status, p.priority;
Might be very simple, but I've been digging fow a few days now... I just can't figure out how to make this SQL query in Access...
In reference to the tables below, i'm looking for the query that can extract all the ITEMS for a specific Shop (ie 1:Alpha) from a specific GROUP (ie 1:Tools), that are NOT in the report for 2014... in this case ITEMS.IDs 6, 8, 9 and 10!
Tables:
Years
ID | Year
-----------------------------------------------
1 | 2014
2 | 2015
Shops
ID | ShopName
-----------------------------------------------
1 | Alpha
2 | Bravo
Items
ID | StockNbr | Description | GroupID
-----------------------------------------------
1 | 00-1200 | Ratchet 1/4 | 1
2 | 00-1201 | Ratchet 1/2 | 1
3 | 00-1300 | Screwdriver Philips No1 | 1
4 | 01-5544 | Banana | 2
5 | 00-4457 | Apple | 2
6 | 21-8887 | Hammer | 1
7 | 21-6585 | Drill | 1
8 | 21-4499 | Multimeter | 1
9 | 21-5687 | Digital Caliper | 1
10 | 22-7319 | File Set | 1
...
Groups
ID | GroupName
-----------------------------------------------
1 | Tools
2 | Fruits
REPORTS
ID | YearID | ShopID | ItemID
-----------------------------------------------
1 | 1 | 1 | 1
2 | 1 | 1 | 2
3 | 1 | 1 | 3
4 | 1 | 1 | 4
5 | 1 | 1 | 7
6 | 1 | 2 | 5
7 | 1 | 2 | 8
8 | 1 | 2 | 10
I've tried this, but then I realize it doesn't take the shops into consideration, it'll list all items that are not listed in reports, so if reports has an item for shop 2, it won't list it either...
SELECT Items.ID, Items.StockNbr, Items.Description, Items.GroupID, Reports.YearID, Reports.ShopID
FROM Reports
RIGHT JOIN Items ON Reports.ItemID = Items.ID
WHERE (((Items.GroupID)=1) AND ((Reports.UnitID) Is Null))
ORDER BY Items.StockNbr;
Thank you!
I think you're looking for an anti-join. There are several ways to do this. Here's one using not in.
select i.* from items i
where i.GroupId = 1
and i.ID NOT IN (
select ItemID from reports r
where r.ShopID = 1
and r.YearID = 2014
)
If the table Reports does not reference Items.ID then there is no available relationship ShopID or YearID
select *
from items
left join reports on items.id = reports.itemid
where reports.itemid IS NULL
My table looks like this:
ID | Multiple | Itemlist_ID | Inventory_ID
----------------------------------------------------------------
1 | 1 | 1 | 1
2 | 1 | 1 | 2
3 | 1 | 1 | 3
4 | 1 | 4 | 2
5 | 1 | 4 | 3
6 | 2 | 4 | 2
7 | 2 | 4 | 3
How do I retrieve records with unique combo of Multiple and Itemlist_ID? For example below:
ID | Multiple | Itemlist_ID | Inventory_ID
----------------------------------------------------------------
1 | 1 | 1 | 1
4 | 1 | 4 | 2
6 | 2 | 4 | 2
Note, this is retrieving for a View where the Inventory_ID won't be shown, so I'm not concerned whether I get back records [1,4,6] or [1,5,7] or [2,4,6]. Using a first command is fine.
You can perform a GROUP BY query in Activerecord using this syntax (replace Model with your class name):
Model.group('Multiple', 'Itemlist_ID').select('Multiple', 'Itemlist_ID')
This would retrieve all unique combinations of (Multiple, Itemlist_ID).
You could optionally add aggregate operations on columns other than the two grouped columns, such as SUM, AVG, COUNT, etc. For example, if you wanted to know how many records are in each group:
Model.group('Multiple', 'Itemlist_ID').select('Multiple', 'Itemlist_ID', 'COUNT(1) AS group_count')
This would add an attribute to the result called 'group_count' that would be the number of records contained in each group
I have two tables:
1. Master
| ID | Name | Amount |
|-----|--------|--------|
| 1 | a | 5000 |
| 2 | b | 10000 |
| 3 | c | 5000 |
| 4 | d | 8000 |
2. Detail
| ID |MasterID| PID | Qty |
|-----|--------|-------|------|
| 1 | 1 | 1 | 10 |
| 2 | 1 | 2 | 20 |
| 3 | 2 | 2 | 60 |
| 4 | 2 | 3 | 10 |
| 5 | 3 | 4 | 100 |
| 6 | 4 | 1 | 20 |
| 7 | 4 | 3 | 40 |
I want to select sum(Amount) from Master which joins to Deatil where Detail.PID in (1,2,3)
So I execute the following query:
SELECT SUM(Amount) FROM Master M INNER JOIN Detail D ON M.ID = D.MasterID WHERE D.PID IN (1,2,3)
Result should be 20000. But I am getting 40000
See this fiddle. Any suggestion?
You are getting exactly double the amount because the detail table has two occurences for each of the PIDs in the WHERE clause.
See demo
Use
SELECT SUM(Amount)
FROM Master M
WHERE M.ID IN (
SELECT DISTINCT MasterID
FROM DETAIL
WHERE PID IN (1,2,3) )
What is the requirement of joining the master table with details when you have all your columns are in Master table.
Also, isnt there any FK relationhsip defined on these tables. Looking at your data it seems to me that there should be FK on detail table for MasterId. If that is the case then you do not need join the table at all.
Also, in case you want to make sure that you have records in details table for the records for which you need sum and there is no FK relationship. Then you could give a try for exists instead of join.