I have all those tables above.
car_model_tbl
-----------------------------
id | car_model_name|status |
-----------------------------
1 | seria_1 | 1 |
-----------------------------
2 | golf_4 | 1 |
-----------------------------
3 | C_Class | 1 |
-----------------------------
4 | golf_5 | 1 |
-----------------------------
5 | seria_2 | 0 |
-----------------------------
car_manufacturer_tbl
-------------------------
id |car_manufactu_name |
-------------------------
1 | bmw |
-------------------------
2 | volkswagen |
-------------------------
3 | mercedes |
-------------------------
car_service_tbl
---------------------------------
id | model_id| service_date |
---------------------------------
1 | 1 | 2018-03-10 |
---------------------------------
2 | 2 | 2018-02-10 |
---------------------------------
3 | 1 | 2018-01-10 |
---------------------------------
4 | 1 | 2017-12-10 |
---------------------------------
5 | 2 | 2017-12-10 |
---------------------------------
6 | 3 | 2018-02-10 |
---------------------------------
7 | 2 | 2018-01-10 |
---------------------------------
9 | 4 | 2018-03-10 |
---------------------------------
10 | 4 | 2018-02-10 |
---------------------------------
11 | 5 | 2018-02-10 |
---------------------------------
car_model_manufacturer_relation
-------------------------------------------------
id | model_id | manufactu_id| service_status |
-------------------------------------------------
1 | 1 | 1 | 1 |
-------------------------------------------------
2 | 5 | 1 | 1 |
-------------------------------------------------
3 | 2 | 2 | 1 |
-------------------------------------------------
4 | 4 | 1 | 1 |
-------------------------------------------------
5 | 2 | 2 | 1 |
-------------------------------------------------
6 | 3 | 3 | 1 |
-------------------------------------------------
I need to update car_model_manufacturer_relation.service_status = '0'
where car_service_tbl.service_date < "2018-03-01".
In this case car_model_manufacturer_relation.service_status of models 2, 3 and 5 should be set to '0' because every car_service_tbl.service_date for these models is smaller than "2018-03-01".
However, for models 1 and 4 car_model_manufacturer_relation.service_status should stay '1' because even that they have records smaller than "2018-03-01" they also have bigger dates ex. "2018-03-10".
I am trying to create a query for this but until now without success.
You'll need to nest a grouped query, to get the MAX date per model, and update from that.
update car_model_manufacturer_relation as cmmr,
(select model_id, max(service_date) as check_date
from car_service_tbl
group by model_id) as cst
set cmmr.service_status = '0'
where cmmr.model_id = cst.model_id
and cst.check_date < "2018-03-01"
Where you're using more than one table and the table names include underscores, I try and alias the tables to make the code a little shorter and easier on the eye, hence the use of cmmr and cst as table aliases.
The MAX date has also been renamed for clarity as check_date. You can of course name this anything you wish.
With sub query:
UPDATE car_model_manufacturer_relation c
LEFT join (SELECT model_id, service_date FROM car_service_tbl ORDER BY service_date DESC LIMIT 1) as s ON s.model_id = c.model_id
SET service_status=0
WHERE c.service_date < "2018-03-01"
#tyro - be careful with your solution, as a LEFT JOIN would update the service status to 0 when there wasn't a service date within the car_service_tbl. You would need to use a full join, rather than just the LEFT JOIN as you suggested in order to update the records correctly I feel.
Related
I want to know what is the top fruit on 2021-08-15 (completed with highest total price), table below:
product
------------------
id | name
------------------
1 | banana
2 | orange
3 | apple
4 | watermelon
5 | pineapple
sales
--------------------------------------------------------------------------------
s_id | sn.id | sn.product_id | sn.status | sn.total_price | created_at
--------------------------------------------------------------------------------
1 | 1 | 2 | BOOKED | 300 | 2021-08-15 12:20:32
| 2 | 5 | COMPLETED | 800 |
| 3 | 5 | COMPLETED | 200 |
2 | 4 | 2 | COMPLETED | 500 | 2021-08-16 09:00:59
| 5 | 1 | CANCELLED | 1000 |
How to write a query on a table with nested records?
Does MySQL even have nested record data type?
select *
from
(select p.id,p.name,sum(s.total_price) as sumOfSales
from product p join sales s on p.id = s.product_id
where s.status = "COMPLETED"
group by p.id,p.name) T
order by sumOfSales desc
I am not able to figure out how I can get the following result with one MySQL Query:
I have two tables:
shop_items
| id | description | price | active |
+----+-------------+-------+--------+
| 1 | product_1 | 5 | 1 |
+----+-------------+-------+--------+
| 2 | product_2 | 10 | 1 |
+----+-------------+-------+--------+
| 3 | product_3 | 15 | 0 |
+----+-------------+-------+--------+
inventory_items (the shop_items a user purchased)
| id | item_id | user_id | active |
+----+---------+---------+--------+
| 1 | 2 | 1 | 1 |
+----+---------+---------+--------+
| 2 | 1 | 1 | 0 |
+----+---------+---------+--------+
I want to see all shop_items where active = 1 including a row called purchased = 0 or 1 based on inventory_items -> matching user_id (where user_id = something) and active = 1
Example output based on the data from above tables -> where user_id = 1:
| item_id | price | description | purchased |
+---------+-------+-------------+-----------+
| 1 | 5 | product_1 | 0 |
+---------+-------+-------------+-----------+
| 2 | 10 | product_2 | 1 |
+---------+-------+-------------+-----------+
What query do I need for this output?
Please note: I only need the result from ONE user_id which I can change within the query :)
Test
SELECT shop_items.*, COALESCE(inventory_items.active, 0) purchased
FROM shop_items
LEFT JOIN inventory_items ON shop_items.id = inventory_items.item_id
AND user_id = 1
WHERE shop_items.active = 1
I have two tables containing fields as below.
Table 1
| SetID | InQty | Day |
| 1 | 10 | 1 |
| 2 | 10 | 2 |
| 3 | 10 | 3 |
Table 2
| SetID | OtQty | Day |
| 1 | 1 | 5 |
| 1 | 2 | 6 |
| 1 | 3 | 7 |
SetID in table 2 is linked with SetId in table 1. Day is placed in place of date, just for convenience only. Expected Output,
| Day | InQty | OtQty |
| 1 | 10 | |
| 5 | | 1 |
| 6 | | 2 |
| 7 | | 3 |
Blank Space can be filled with NULL or Zero.
It appears you are querying ONLY for set ID = 1 otherwise, I would expect to see in/out values for Set 2 and 3. You should be able to get with a simple UNION
select t1.Day, t1.InQty, 0 OutQty
from Table1 t1
where SetID = 1
order by t1.Day
union select t2.Day, 0, t2.OtQty
from Table2 t2
where SetID = 1
Now, if you want totals spanning different "setID"s and keeping them differentiated from each other, just add the setID as a column and also add to the group by clause as well.
I have a table called lottery_winners with the following useful colums:
+----+------+------+--------+---------+
| id | plid | zbid | amount | numbers |
+----+------+------+--------+---------+
id is the unique, primary id for the table. plid refers to the past_lotteries table (i.e I can get all the lottery winners from a specific lottery in the past this way. zbid is the id of the member/user (the winner). amount is the sum of money they won in the lottery, and finally numbers is a VARCHAR CSV field with their lottery numbers.
Here's an example of what rows could be in the table:
+----+------+------+--------+---------+
| id | plid | zbid | amount | numbers |
+----+------+------+--------+---------+
| 1 | 1 | 2 | 1 | 1,2,3 |
+----+------+------+--------+---------+
| 2 | 1 | 4 | 5 | 4,5,6 |
+----+------+------+--------+---------+
| 3 | 1 | 3 | 7 | 3,4,5 |
+----+------+------+--------+---------+
| 4 | 1 | 2 | 3 | 7,8,9 |
+----+------+------+--------+---------+
| 5 | 2 | 2 | 8 | 8,9,10 |
+----+------+------+--------+---------+
Now, I want to run a SELECT statement which will bring back all the rows but in a really specific order. The rows should be in grouped by zbid as such (in this case I have added a WHERE plid=1 clause):
+----+------+------+--------+---------+
| id | plid | zbid | amount | numbers |
+----+------+------+--------+---------+
| 1 | 1 | 2 | 1 | 1,2,3 |
+----+------+------+--------+---------+
| 4 | 1 | 2 | 3 | 7,8,9 |
+----+------+------+--------+---------+
| 2 | 1 | 4 | 5 | 4,5,6 |
+----+------+------+--------+---------+
| 3 | 1 | 3 | 7 | 3,4,5 |
+----+------+------+--------+---------+
Next criteria is that not only should they be grouped by zbid, but within this grouping they should be ordered by amount DESC. This is what it would now look like:
+----+------+------+--------+---------+
| id | plid | zbid | amount | numbers |
+----+------+------+--------+---------+
| 4 | 1 | 2 | 3 | 7,8,9 |
+----+------+------+--------+---------+
| 1 | 1 | 2 | 1 | 1,2,3 |
+----+------+------+--------+---------+
| 2 | 1 | 4 | 5 | 4,5,6 |
+----+------+------+--------+---------+
| 3 | 1 | 3 | 7 | 3,4,5 |
+----+------+------+--------+---------+
The top two rows have swapped around.
One more criteria. As you can see, although they are grouped by zbid, there's no specific order to them. I want it to group by zbid, but the order should be based on sum(amount) for each group.
The following table shows the totals for each zbid in no specific order (taking into account that plid=1:
+------+-------------+
| zbid | sum(amount) |
+------+-------------+
| 2 | 4 |
+------+-------------+
| 3 | 7 |
+------+-------------+
| 4 | 5 |
+------+-------------+
So using this information the final result using the SELECT statement should be the following (with an added sum(amount) column):
+----+------+------+--------+---------+-------------+
| id | plid | zbid | amount | numbers | sum(amount) |
+----+------+------+--------+---------+-------------+
| 3 | 1 | 3 | 7 | 3,4,5 | 7 |
+----+------+------+--------+---------+-------------+
| 2 | 1 | 4 | 5 | 4,5,6 | 5 |
+----+------+------+--------+---------+-------------+
| 4 | 1 | 2 | 3 | 7,8,9 | 4 |
+----+------+------+--------+---------+-------------+
| 1 | 1 | 2 | 1 | 1,2,3 | 4 |
+----+------+------+--------+---------+-------------+
That's it! Now I've tried a couple of things myself, but I'm not exactly sure how to get the full final result. I have tried:
SELECT id,plid,zbid,amount,numbers,sum(amount) FROM lottery_winners GROUP BY zbid ORDER BY sum(amount) DESC
Now that seemed to meet the final criterion, but it didn't give me individual results for the table.
Please also note that as these results will be paginated, I will need to be adding LIMIT $start,$perpage to the end of the query.
have this a try:
SELECT a.id,
a.plid,
a.zbid,
a.amount,
a.numbers,
c.totalAmount
FROM lottery_winners a
INNER JOIN (
SELECT b.zbid,
SUM(b.amount) totalAmount
FROM lottery_winner b
WHERE b.plid = 1
GROUP BY b.zbid
) c
ON a.zbid = c.zbid
WHERE a.plid = 1
ORDER BY c.totalAmount desc
I have two tables, rating:
+-----------+-----------+-------------+----------+
| rating_id | entity_id | rating_code | position |
+-----------+-----------+-------------+----------+
| 1 | 1 | Quality | 0 |
| 2 | 1 | Value | 0 |
| 3 | 1 | Price | 0 |
+-----------+-----------+-------------+----------+
And rating_option
+-----------+-----------+------+-------+----------+
| option_id | rating_id | code | value | position |
+-----------+-----------+------+-------+----------+
| 1 | 1 | 1 | 1 | 1 |
| 2 | 1 | 2 | 2 | 2 |
| 3 | 1 | 3 | 3 | 3 |
| 4 | 1 | 4 | 4 | 4 |
| 5 | 1 | 5 | 5 | 5 |
| 6 | 2 | 1 | 1 | 1 |
| 7 | 2 | 2 | 2 | 2 |
| 8 | 2 | 3 | 3 | 3 |
| 9 | 2 | 4 | 4 | 4 |
| 10 | 2 | 5 | 5 | 5 |
| 11 | 3 | 1 | 1 | 1 |
| 12 | 3 | 2 | 2 | 2 |
| 13 | 3 | 3 | 3 | 3 |
| 14 | 3 | 4 | 4 | 4 |
| 15 | 3 | 5 | 5 | 5 |
+-----------+-----------+------+-------+----------+
I need a SQL query (not application level, must stay in the database) which will select a set of ratings randomly. A sample result would look like this, but would pick a random value for each rating_id on subsequent calls:
+-----------+-----------+------+-------+----------+
| option_id | rating_id | code | value | position |
+-----------+-----------+------+-------+----------+
| 1 | 1 | 1 | 1 | 1 |
| 8 | 2 | 3 | 3 | 3 |
| 15 | 3 | 5 | 5 | 5 |
+-----------+-----------+------+-------+----------+
I'm totally stuck on the random part, and grouping by rating_id has been a crap shoot so far. Any MySQL ninjas want to take a stab?
Thanks,
Joe
EDIT: I've tried rand() in a bunch of combinations, and I'm sure that it will be necessary to create the randomness of the result, but I cannot figure out how to return one random row for each of the rows in rating. I cannot use order by rand() limit 1 because I need three rows, and order by rand() limit 3 won't give me one of each rating_id, which is the ultimate goal. I need a combination of rand() and either subqueries or joins so that I can ensure one of each rating_id.
Alright, a little messy, but seems to do the job. Someone may know what they're doing better than I do that can clean this up:
SELECT random.rating_id, random.rand_option_id, r3.code, r3.value, r3.position
FROM
(SELECT r.rating_id,
(SELECT r2.option_id
FROM rating_option r2
WHERE r2.rating_id = r.rating_id
ORDER BY RAND() LIMIT 1) AS 'rand_option_id'
FROM rating_option r
GROUP BY r.rating_id
) random
LEFT JOIN rating_option AS r3 ON r3.option_id = rand_option_id
Results (varies every time, of course):
+-----------+----------------+------+-------+----------+
| rating_id | rand_option_id | code | value | position |
+-----------+----------------+------+-------+----------+
| 1 | 4 | 4 | 4 | 4 |
| 2 | 6 | 1 | 1 | 1 |
| 3 | 13 | 3 | 3 | 3 |
+-----------+----------------+------+-------+----------+
You could use the rand() function to do sorting in a select on the rating table.
For example:
select rating_id from rating order by rand() limit 1
As clarified in your comments, and the other posts above
select * from rating_option order by rand()
will return all records in a random order... However, if you want only X number, then inclue that as the limit as noted by others
select * from rating_option order by rand() limit 5 (or whatever number)
Have you looked into the rand() function?
SELECT column FROM table
ORDER BY RAND()
LIMIT 1
http://www.petefreitag.com/item/466.cfm
http://dev.mysql.com/doc/refman/5.0/en/mathematical-functions.html#function_rand
Sample code
select *
from rating_option
group by rating_id
order by rand()