I have a list of dates called listings where people can signup to take part called a booking.
listings
id | date | capacity
1 2010-01-01 3
2 2010-01-02 1
3 2010-02-02 2
bookings
id | listing_id | name
1 1 Chris
2 1 Steve
3 1 Allen
4 2 Tracy
What I want to do is have a query which returns only the open listings based on the bookings.
Query would only return the listing with id = 3. Since it has no bookings and a capacity of 2.
Sample query which won't work:
SELECT
*
FROM
listings
HAVING COUNT(
SELECT * FROM bookings WHERE listings.id=bookings.listing_id
) < capacity
Any help is appreciated.
SELECT *
FROM listings
WHERE capacity > (SELECT count(*)
FROM bookings
WHERE listings.id=bookings.listing_id)
SELECT
listings.id,
max(listings.date),
max(listings.capacity)
FROM listings
left join bookings on listings.id = bookings.listing_id
group by listings.id
having COUNT(bookings.listing_id) < max(listings.capacity)
*Myself, I would do a join and then count:
SELECT COUNT(*) as count
FROM listings, bookings
WHERE listings.id=bookings.listing_id
AND count < listings.capacity
GROUP by listings.id
I haven't tested it but that's the general idea!
Related
The user table looks like this:
user_id
name
surname
1
a
aa
2
b
bb
3
c
cc
The book's table looks like this:
user_id
book_name
1
book1
1
book2
1
book3
2
book1
The expenses table looks like this:
user_id
amount_spent
date
1
10
2020-02-03
1
30
2020-02-02
1
10
2020-02-01
1
15
2020-01-31
1
13
2020-01-15
2
15
2020-02-01
3
20
2020-02-01
The result which I want:
CountUsers
amount_spent
2
65
Explanation: I want to count how many users have book1 and how much total they spend on a date between 2020-02-01 - 2020-02-03.
Now how the query should look like?
I am using MySQL version 8.
I have tried:
SELECT
count(*), sum(amount_spend) as total_amount_spend
FROM
(select sum(amount_spend) as amount_spend
FROM expanses
LEFT JOIN books ON books.user_id = expanses.user_id WHERE books.book_name ='book1 GROUP BY expanses.user_id) src'
And the result is wrong because I am getting a higher amount_spend than in my table result above. I think while joining the table there are some duplicates but I do not know how to fix them.
I want to count how many users have book1 and how much total they spend on a date between 2020-02-01 - 2020-02-03.
I am thinking:
select count(*), sum(e.amount_spent)
from user_books ub join
expenses e
on ub.user_id = e.user_id
where book_name = 'book1';
Note: This assumes that user_books doesn't have duplicate rows.
FIDDLE
You miss the date part in your code.
SELECT
count(*), sum(amount_spent) as total_amount_spend
FROM
(select sum(amount_spent) as amount_spent
FROM expanses
LEFT JOIN books ON books.user_id = expanses.user_id
WHERE books.book_name ='book1'
and expanses.date between '2020-02-01' and '2020-02-03'
GROUP BY expanses.user_id) src;
will do a job.
Please note that you don't need to have left join here (unless you're sure that it may happen that no expenses at all for given user will be), and you don't need to have grouping in subquery. So your query could look like:
select count(distinct expanses.user_id), sum(amount_spent) as amount_spent
from expanses
inner join books on books.user_id = expanses.user_id
where books.book_name ='book1'
and expanses.date between '2020-02-01' and '2020-02-03';
How to get those entries which have more than 1 records?
If it doesn't make sense... let me explain:
From the below table I want to access the sum of the commission of all rows where type is joining and "they have more than 1 entry with same downmem_id".
I have this query but it doesn't consider more entries scenario...
$search = "SELECT sum(commission) as income FROM `$database`.`$memcom` where type='joining'";
Here's the table:
id mem_id commission downmem_id type time
2 1 3250 2 joining 2019-09-22 13:24:40
3 45 500 2 egbvegr new time
4 32 20 2 vnsjkdv other time
5 23 2222 2 vfdvfvf some other time
6 43 42 3 joining time
7 32 353 5 joining time
8 54 35 5 vsdvsdd time
Here's the expected result: it should be the sum of the id no 2, 7 only
ie. 3250+353=whatever.
It shouldn't include id no 6 because it has only 1 row with the same downmem_id.
Please help me to make this query.
Another approach is two levels of aggregation:
select sum(t.commission) income
from (select sum(case when type = 'joining' then commission end) as commission
from t
group by downmem_id
having count(*) > 1
) t;
The main advantage to this approach is that this more readily supports more complex conditions on the other members of each group -- such as at most one "joining" record or both "joining" records and no more than two "vnsjkdv" records.
Use EXISTS:
select sum(t.commission) income
from tablename t
where t.type = 'joining'
and exists (
select 1 from tablename
where id <> t.id and downmem_id = t.downmem_id
)
See the demo.
Results:
| income |
| ----- |
| 3603 |
You can use subquery that will find all downmem_id having more than one occurrence in the table.
SELECT Sum(commission) AS income
FROM tablename
WHERE type = 'joining'
AND downmem_id IN (SELECT downmem_id
FROM tablename t
GROUP BY downmem_id
HAVING Count(id) > 1);
DEMO
I have read the different answers here on SO, but I am stuck on this question. Please help.
I have this mysql view named "activeuser":
userid COUNT(*) ACRONYM
1 23 admin
2 2 doe
3 4 tompa
12 4 Marre
13 1 Mia
1 2 admin
3 1 tompa
12 1 Marre
13 1 Mia
2 1 doe
3 1 tompa
12 1 Marre
How can I sum the COUNT column so that I get the following wanted result?
userid COUNT(*) ACRONYM
1 25 admin
2 3 doe
3 6 tompa
12 6 Marre
13 1 Mia
EDITED:
I used this query to create the view:
CREATE VIEW activeuser AS
(SELECT boats_comments.userid, COUNT(boats_comments.userid), boats_user.acronym, boats_user.email
FROM boats_comments
INNER JOIN boats_user
ON boats_comments.userid = boats_user.id
GROUP BY boats_comments.userid
ORDER BY COUNT(boats_comments.userid) DESC)
UNION ALL
(SELECT boats_answers.userid, COUNT(boats_answers.userid), boats_user.acronym, boats_user.email
FROM boats_answers
INNER JOIN boats_user
ON boats_answers.userid = boats_user.id
GROUP BY boats_answers.userid
ORDER BY COUNT(boats_answers.userid) DESC)
UNION ALL
(SELECT boats_questions.userid, COUNT(boats_questions.userid), boats_user.acronym, boats_user.email
FROM boats_questions
INNER JOIN boats_user
ON boats_questions.userid = boats_user.id
GROUP BY boats_questions.userid
ORDER BY COUNT(boats_questions.userid) DESC)
My goal is to see which users are the most active by checking the number of comments, questions and answers... but I got stuck...
As the results in your view has duplicates I guess the underlying code for the view is grouping on something it maybe shouldn't be grouping on.
You can get the results you want by applying SUM to it:
select userid, sum("whatever column2 is named") as "Count", Acronym
from activeuser group by userid, Acronym;
select userid, count(*) from activeuser group by userid;
I have the following tables:
table part_list:
part_number | description | type
100 blablabla blabla
table part_list_supplier:
part_id | artikel
100 100100
100 200100
and I have this query:
select part_list.part_number, part_list.description, part_list.type, group_concat(coalesce(part_list_supplier.artikel, "nothing")) as "artikel"
from part_list
left join part_list_supplier on (part_list.part_number = part_list_supplier.part_id)
group by part_list.part_number;
this is the result:
part_number | description | type | artikel
100 blablablabla blabla 100100,200100
but I want to show the total stock per partnumber behind it. table receipt:
Number | import
100 5
100 10
table sales:
Number | sold
100 5
this is my query for one table:
SELECT SUM(sold) AS sold
FROM sales WHERE number = '".$partnumber.”'
but I want to calculate the stock per number and that must be shown behind the other results.
the full result:
part_number | description | type | artikel | stock
100 blablablabla blabla 100100,200100 10
The stock should be 10 because the total number of imports is 15 (5 + 10) and the total number of sales is 5.
I broke this up into pieces to solve it. I started by writing two queries, one that counted total receipt and one that counted total sales:
SELECT r.number, SUM(r.import) AS totalIn
FROM receipt r
GROUP BY r.number;
SELECT s.number, SUM(s.sold) AS totalOut
FROM sales s
GROUP BY s.number;
Then, I used those as two subqueries of a join to get the stock:
SELECT r.number, totalIn - totalOut AS stock
FROM(
SELECT r.number, SUM(r.import) AS totalIn
FROM receipt r
GROUP BY r.number) r
JOIN(
SELECT s.number, SUM(s.sold) AS totalOut
FROM sales s
GROUP BY s.number) s ON s.number = r.number;
Once I verfied this gave the proper stock, I was able to include those subqueries into your original query to build this:
SELECT pl.part_number, pl.description, pl.type,
GROUP_CONCAT(COALESCE(pls.artikel, "Nothing.")) AS artikel,
r.totalIn - s.totalOut AS stock
FROM part_list pl
LEFT JOIN part_list_supplier pls ON pls.part_id = pl.part_number
JOIN(
SELECT number, SUM(import) AS totalIn
FROM receipt
GROUP BY number) r ON r.number = pl.part_number
JOIN(
SELECT number, SUM(sold) AS totalOut
FROM sales
GROUP BY number) s ON s.number = r.number
GROUP BY pl.part_number;
Here is an SQL Fiddle example.
I may not be understanding your question properly, but can't you just add sum(sales.sold) to your select statement and join the sales table? E.g.:
select part_list.part_number, part_list.description, part_list.type, group_concat(coalesce(part_list_supplier.artikel, "nothing")) as "artikel", sum(sales.sold)
from part_list
left join part_list_supplier on (part_list.part_number = part_list_supplier.part_id)
left join sales on (part_list.part_number = sales.number
group by part_list.part_number;
I try to find a similar question but didn't find an exact one so I'll post mine:
I have 2 tables:
room (room_id)
room_reservation (room_id, date)
How can I return list of rooms that have at least 1 day free between 2 dates.
For example, if I have those rooms:
room_id 1, 2 & 3
then in room_reservation table, I have the following:
1 - 2012-07-22
1 - 2012-07-23
1 - 2012-07-24
1 - 2012-07-25
1 - 2012-07-26
2 - 2012-07-23
2 - 2012-07-24
then doing a search for available room between 2012-07-22 and 2012-07-26 should return only room #2 and #3.
I have this query so far but didn't work... please help!
SELECT DISTINCT room_id AS id
FROM room
WHERE (SELECT COUNT('listing') FROM listing_calendar WHERE listing = l.listing_id AND date BETWEEN '2012-07-22' AND '2012-07-26' GROUP BY listing) < 5"
Thanks for the help!
You can use this solution:
SELECT a.room_id
FROM rooms a
LEFT JOIN room_reservations b ON
a.room_id = b.room_id AND
b.date BETWEEN '2012-07-22' AND '2012-07-26'
GROUP BY a.room_id
HAVING COUNT(b.room_id) < DATEDIFF('2012-07-26', '2012-07-22') + 1
SQLFiddle Demo