I've been trying to set up this query.
SELECT P.ProductNo,P.Description, AVG(OrderLine.ActualPrice)
FROM Product P
INNER JOIN OrderLine
ON OrderLine.ProductNo = P.ProductNo
WHERE AVG(ActualPrice) >
(SELECT AVG(ActualPrice)
FROM OrderLine)
My goal here is to compare the average actual price for a product to the average price of all products together. But I don't seem to be getting it to work. Where am I going wrong here?
use GROUP BY
when using aggregated condition, use HAVING instead of WHERE
query,
SELECT P.ProductNo, P.Description, AVG(OrderLine.ActualPrice)
FROM Product P
INNER JOIN OrderLine
ON OrderLine.ProductNo = P.ProductNo
GROUP BY P.ProductNo, P.Description
HAVING AVG(ActualPrice) > (SELECT AVG(ActualPrice) FROM OrderLine)
Related
I have the following tables:
Orders (OID, Count, ProductID, TableNr)
Table (TableNr, Name, Number)
Products (ProductID, Prize)
Now I want to calculate how much was earned per table. I think to do this I have to Group By Orders.TableNr. But how can I multiply the Products.Prize with the Orders.Count and after that sum up this results within the group?
You are describing a join and aggregation:
select o.tableNr, sum(o.count * p.prize) totalEarned
from orders o
inner join products p on p.productId = o.productId
group by o.tableNr
If you want to display table information as well (say, the table name), then you can add another join:
select t.tableNr, t.name, sum(o.count * p.prize) totalEarned
from table t
inner join orders o on o.tableNr = t.tableNr
inner join products p on p.productId = o.productId
group by t.tableNr, t.name
Note that table is a SQL keyword, hence not a good choice for a table name.
I have the tables products and history and I need to group by name:
products = (id_product, name)
history = (id_history, id_product, amount)
I tried this SQL query but it isn't grouped by name:
SELECT
products.name,
sum(history.amount)
FROM history
INNER JOIN products ON history.id_product = products.id_product
GROUP BY
products.name,
history.amount,
history.id_history;
This is the result:
You should only be grouping by the attributes you need to be aggregated. In this case, you need only products.name.
SELECT
products.name,
sum(history.amount) AS [Amount]
FROM history
INNER JOIN products ON history.id_product = products.id_product
GROUP BY
products.name;
If you need to include products without history (assuming sum should be 0 instead of null in this case), then you can use an OUTER JOIN instead of INNER JOIN to include all products:
SELECT
products.name,
COALESCE(sum(history.amount), 0) AS [Amount]
FROM history
RIGHT OUTER JOIN products ON history.id_product = products.id_product
GROUP BY
products.name;
This is no answer, but too long for a comment.
For readability's sake the product table should be first. After all it is products that we select from, plus a history sum that we can access via [left] join history ... followed by an aggregation, or [left] join (<history aggregation query>), or a subselect in the select clause.
Another step to enhance readability is the use of alias names.
Join the table, then aggregate
select p.name, coalesce(sum(h.amount), 0) as total
from products p
left join history h on h.id_product = p.id_product
group by p.name
order by p.name;
Aggregate, then join
select p.name, coalesce(h.sum_amount, 0) as total
from products p
left join
(
select sum(h.amount) as sum_amount
from history
group by id_product
) h on h.id_product = p.id_product
order by p.name;
Get the sum in the select clause
select
name,
(select sum(amount) from history h where h.id_product = p.id_product) as total
from products p
order by p.name;
And as you were confused on how to use GROUP BY, here is an explanation: GROUP BY ___ means you want one result row per ___. In your original query you had GROUP BY products.name, history.amount, history.id_history saying you wanted one result row per name, amount, and id, while you actually wanted one row per name only, i.e. GROUP BY products.name.
I am doing an e-commerce marketplace. There are many sellers selling in this marketplace. For each seller, I would like to display a Best Sellers list.
Database is in SQL Server. There are 2 main tables in this case:
Table 1: Stores each order's ordered products. Fields include SellerID, OrderID, ProductID, and Quantity.
Table 2: The products master table. Fields include ProductID, ...
How can I do a query to get the top 10 products with the most orders? My SQL below doesn't seem to work...
SELECT TOP (10) SUM(d.Quantity) AS total, d.ProductID, p.Title
From OrderDetails d, Products p
WHERE d.SellerID = 'xxx' AND
d.ProductID = p.ProductID
GROUP by d.ProductID
ORDER BY total DESC
Any help is much appreciated. Thank you!
select *, d.s
from products p
inner join
(
select top 10 productid, sum(quantity) as s
From OrderDetails
group by productid
order by sum(quantity) desc
)
d on d.productid = p.productid
See this SQLFiddle example
This is just a guess. If you want the "most orders" then I would rather count the orders instead of summing the quantity.
SELECT TOP 10
COUNT(d.OrderID) AS total, d.ProductID, p.Title
FROM OrderDetails d
INNER JOIN Products p ON d.ProductID = p.ProductID
WHERE d.SellerID = 'xxx'
GROUP by d.ProductID, p.Title
ORDER BY COUNT(d.OrderID) DESC
What else I fixed:
GROUP BY was missing a column. You have to name every column you have in your SELECT clause but is not in an aggregate function.
In the ORDER BY clause you have to name it exactly like you did in SELECT clause. Aliases don't work well in SQL Server.
Used the INNER JOIN syntax, which is less error prone to forgetting to specify the join in the WHERE clause.
This is not because of what type of database you using but aggregate function. There are lots of q & a regarding of this problem in stackoverflow. Please search for it.
I have 2 tables with related data. One table is for products and the other price. In the price table one product may appear several times. How can I return the result by grouping.
Below is my Query but the output is not with Group
SELECT distinct
p.Product,
p.Qty,
MAX(pr.netprice)
FROM Products p
LEFT OUTER JOIN Price pr ON p.Product=pr.Product
WHERE p.brand=''
GROUP BY p.Product, p.Qty
You should probably leave the Qty out of the group by, like this:
SELECT p.Product,
MAX(pr.netprice)
FROM Products p
LEFT OUTER JOIN Price pr ON p.Product=pr.Product
WHERE p.brand=''
GROUP BY p.Product
I have 2 tables with related data.
one table is for products. and the other price. In price table one product may appear several times.
How can I return the result showing the products without containing duplicate rows
My Query is
select p.Product, sum(p.Qty), max(pr.netprice)
from Products p
left outer join Price pr
on p.Product=pr.Product
where p.brand=''
group by p.Product,pr.Product
but return more rows as right table have multiple records
please help
I don't think distinct is the way to go, I think group by should result in what you want if done correctly. Also, I don't think you need to group on values from both tables.. You should really understand what you want to. Give us example data and it will be easier to answer your question. Try this:
select p.Product, sum(p.Qty), max(pr.netprice)
from Products p
left outer join Price pr on p.Product = pr.Product
where p.brand = ''
group by p.Product -- only group on param.
Use the distinct keyword. That will remove duplicates. ALthough, if there are different prices for a given product, there will be one record per unique price per product if you remove the Max().
select DISTINCT p.Product, sum(p.Qty),max(pr.netprice)
from Products p
left outer join Price pr on p.Product=pr.Product
where p.brand='' group by p.Product,pr.Product
Try putting distinct in select. I am not sure it will work, but try it.
If you want the sum then use Tomas answer above. This will give you a unique product list with the total quantity and maximum price for each product
select p.Product, sum(p.Qty), max(pr.netprice)
from Products p
left outer join Price pr on p.Product = pr.Product
where p.brand = ''
group by p.Product
What about changing it this way:
SELECT p.Product, sum(p.Qty),
(SELECT max(pr.netprice)
FROM Price pr
WHERE p.Product=pr.Product
)
FROM Products p
WHERE p.brand=''
Try this
SELECT p.Product, p.Qty, MAX(pr.netprice)
FROM Products p
LEFT OUTER JOIN Price pr ON p.Product=pr.Product
WHERE p.brand=''
GROUP BY p.Product, p.Qty