I have a table ORDERS with columns NAME and AMOUNT.
I need to get a NAME and total AMOUNT of each product.
I have such a solution
select PRODUCT_NAME, SUM(AMOUNT) from ORDERS GROUP BY PRODUCT_NAME;
But I dont use any subqueries for achieving that. But the lesson that Im going through is about subqueries. May be Im wrong about this solution?
Its a simple aggregation query without a need of sub query like:
SELECT name, SUM(AMOUNT)
FROM Orders
GROUP BY name
This solution is perfectly fine:
selectname, sum(amount)
from Orders
group by name
But, if you must use subquery, use this:
select o2.name,
(select sum(amount)
from Orders o1
where o1.name = o2.name) as total
from
(select distinct name
from Orders) o2
Related
I need help on a course question for my school. So I am supposed to get two tables Seller & Item, and I need to return the most active seller based on the most items offered. I have the tables as links below.
How could I just return one record with the sellers ID# and Name? Do I need to do a subquery? Thank you so much in advance.
Actually this is a way to accomplish it via subquery. I don't know that any teacher would anticipate students using >= all though:
select s.sellerid, min(s.name) as name
from seller s inner join item i on i.sellerid = s.sellerid
group by s.sellerid
having count(*) >= all (
select count(*)
from item
group by sellerid
)
You can also do it doubly=nested without even needing aliases!
select * from seller where sellerid in
(
select sellerid from item group by sellerid
having count(*) >= all (select count(*) from item group by sellerid)
)
How come this query returns an error?
select CUSTOMER, TOTAL_VALUE
from CUSTOMER, SALES
where TOTAL_VALUE in (select max(TOTAL_VALUE), min(TOTAL_VALUE)
from SALES)
When I just do max(TOTAL_VALUE) or min(TOTAL_VALUE) alone it works perfectly. But I need to get the min number in TOTAL_VALUE and max number in TOTAL_VALUE. Can anyone help me figure out why this query won't work for me? I would like to keep the structure that i have (using the in operator and nested subquery)
It returns an error because the subquery is returning two values, not one. Here is one fix:
select CUSTOMER, TOTAL_VALUE
from CUSTOMER cross join
SALES join
(select max(TOTAL_VALUE) as maxt, min(TOTAL_VALUE) as mint
from sales
) sm
where s.total_value in (sm.maxt, sm.mint);
That said, the query makes no sense. There you are going to get a list of every customer along with the value of the overall minimum and maximum sales.
This does answer your question. If you have another question, then provide sample data, desired results, in another question.
Try this (Joining SALES and CUSTOMER tables):
select C.CUSTOMER, MIN(TOTAL_VALUE), MAX(TOTAL_VALUE)
from SALES S
join CUSTOMER C on S.Customer_ID=C.Customer_ID
group by C.CUSTOMER
order by C.CUSTOMER
I would like to get the minimum sales of each product without using any GROUP BY and ROWNUM function. Just wondering how can I accomplish that. Any inputs would be appreciated.
If I understand your question correctly, you want something like this:
SELECT DISTINCT ON (product_id) product_id, sales
FROM mytable
ORDER BY product_id, sales;
Try this,
SELECT value,productid FROM
table T1
WHERE value=(select min(value)
from table t2
where t1.productid=t2.productid)
Without knowing the table structure, this is impossible to answer correctly. But assuming your orders table has an order_id (PK), a customer_id and sales column, this should do it:
select o1.product_id, o1.sales
from orders o1
where o1.sales <= all (select o2.sales
from orders o2
where o2.product_id = o1.product_id
and o2.order_id <> o1.order_id);
I am new to PostgreSQL and restored this Database in order to practice my Queries. It contains the following Tables:
What is the best query to find how many orders have an order_total that is less than the sum of their line_total(s)?
This is the query I have but I doubt that my number is accurate. I feel like I am doing something wrong:
select COUNT(order_total) from orders
join order_lines
on orders.id = order_lines.order_id
having count(order_total) < sum(line_total)
Am I querying correctly or not?
Thanks
Pill
perhaps something like this
select o.order_total,sum( l.line_total) as sum_line_total
from orders o join order_lines l on o.orders.id=l.order_id
group by o.order_total
having o.order_total < sum(l.line_total)
That answer gave more than one result. I experimented and came across the correct answer by using the following sub-query:
select count(*) from orders,
(Select order_id, sum(line_total) from order_lines group by order_id) a
where order_total < a.sum and order_id = orders.id;
Thanks though for the response
Pill
I have a SQL query that returns data which includes quote types along with customer information. There are 4 types of quotes (Open, Dead, Requote, Project). I want to be able to count each type for each customer. And also count the total. I have not found a way to accomplish this.
Ultimately I want this to go into a gauge on an SSRS report so that we can tell how many of the quotes (percentage) eventually turn into a project.
I haven't found anything in my searches that works. Thanks in advance for any advice.
Using CTE's
WITH quoteTotal as (
Select customer, count(*) as customer_total
from customer
group by customer
),
typeQuote as (
Select customer, quote_type, count(*) as quote_total
from customer
group by customer, quote_type
)
SELECT T.customer, T.quote_type, T.quote_total, Q.customer_total
FROM typeQuote T
INNER JOIN quoteTotal Q
ON T.customer = Q.customer
I think using window functions can be easy.
SELECT DISTINCT
customer,
quote_type,
COUNT(*) OVER (partition by customer, quote_type order by customer) as type_total,
COUNT(*) OVER (partition by customer order by customer) as customer_total
FROM customers
For the data as below:
I have executed the query below
select CustomerEntityId,QuoteType,
(select count(QuoteType) from Customers c
where c.QuoteType=Customers.QuoteType
and c.CustomerEntityId=customers.CustomerEntityId
group by CustomerEntityId,QuoteType) as QuoteTypeTotal,
(select count(*) from Customers c1
where c1.CustomerEntityId=Customers.CustomerEntityId
group by CustomerEntityId) as CustomerTotal
from Customers
Group By CustomerEntityId,QuoteType
Order By CustomerEntityId
The result is as below :
I hope it helps.