Hi there i have two tables a2_deal(I havent mentioned entire table as its very big)
deviceID companyID stage serverTime
1 14 -1 1349449200
1 1 -1 1349445600
2 21 -1 1349449200
3 17 -1 1349447160
1 14 3 1344449200
1 14 2 1340449200
and another table called a2_comp
companyID name
1 Microsoft
14 DELL
15 APPLE
17 Google
I am trying to get the most recent stage of a company By using below query:
SELECT deal.companyID, companies.name as Company,
if(max(serverTime),stage,Null) as Stage
FROM `a2_deal` AS deal
LEFT JOIN `a2_comp` AS companies ON deal.companyID = companies.companyID
GROUP BY companyID
ORDER BY serverTime
in my query i am using if(max(serverTime),stage,Null) as Stage which means select the stage value related to most recent server time . ie it should give me -1 as the stage of companyID 14.... But for some reason i am not getting correct output..Please explain how my logic is wrong here... Thank You
You want the groupwise maximum:
SELECT a2_comp.*, a2_deal.*
FROM a2_deal NATURAL JOIN (
SELECT companyID, MAX(serverTime) AS serverTime
FROM a2_deal
GROUP BY companyID
) t JOIN a2_comp USING (companyID)
See it on sqlfiddle.
case is used for inline conditions in your query. Also, you may need to do
(case when max(serverTime) = serverTime then stage else null end) as Stage
I'm not totally sure that's valid, but you can try it out.
Try this
SELECT deal.companyID, deal.stage, comp.name
FROM a2_deal AS deal, a2_comp AS comp
WHERE deal.serverTime =
(SELECT MAX(deal2.serverTime)
FROM a2_deal AS deal2
WHERE deal2.companyID = deal.companyID)
AND comp.companyID = deal.companyID
GROUP BY deal.companyID
This might be a little confusing but the most interesting part is the sub query which selecting recent serverTime for each company. I have used theta style query and hence JOIN is not necessary.
Related
Sorry I don't know how to describe the topic.
i have a database where i store the unixtime of the entries and some other stuff, in this case the column "name" for the user and "type" it can be 1 or 2.
I want to check if there are entries where name is the same and type switches from 1 to 2 and back to 1 or 2 1 2 within 5 seconds.
So it shows me something like this:
Unixtime Name type
1550293559 Peter 2
1550293560 Peter 1
1550293561 Peter 2
Is there a query that can help me do this?
Sorry I really hope you guys understand that, I don't know how to explain the problem properly.
Thanks.
You can do that with a 3x self join on that table and the necessary conditions (All 3 rows have the same name etc.). See http://www.mysqltutorial.org/mysql-self-join/ for more info.
Note that as the join produces all the possible permutations as input material, you don't have to 'permute' the conditions in the where part of the query. E.g. To get the 5 second rule, you can just say
... where e1.unixtime > e2.unixtime and e2.unixtime > e3.unixtime and e3.unixtime+6 > e1.unixtime ...
Edit: since the original answer was downwoted, here is the full query (grumble grumble) assuming the table name 'sotest':
SELECT
*
FROM
sotest e1
JOIN
sotest e2
JOIN
sotest e3
WHERE
(e1.name = e2.name AND e2.name = e3.name
AND e1.unixtime > e2.unixtime
AND e2.unixtime > e3.unixtime
AND e3.unixtime + 6 > e1.unixtime)
AND ((e1.type = 1 AND e2.type = 2
AND e3.type = 1)
OR (e1.type = 2 AND e2.type = 1
AND e3.type = 2))
SELECT product.productID
, product.Name
, product.date
, product.status
FROM product
INNER JOIN shelf ON product.sheldID=shelf.shelfID
WHERE product.weekID = $ID
AND product.date < '$day'
OR (product.date = '$day' AND shelf.expire <= '$time' )
ORDER BY concat(product.date,shelf.expire)
I am trying to stop the SQL statement at a specific value e.g. bad.
I have tried using max-date, but am finding it hard as am making the time stamp in the query. (Combining date/time)
This example table shows that 3 results should be returned and if the status "bad" was the first result than no results should be returned. (They are ordered by date and time).
ProductID Date status
1 2017-03-27 Good
2 2017-03-27 Good
3 2017-03-26 Good
4 2017-03-25 Bad
5 2017-03-25 Good
Think I may have fixed it, I added this to my while loop.
The query gives the results in order by present to past using date and time, this while loop checks if the column of that row is equal to 'bad' if it is does something (might be able to use an array to fill it up with data). If not than the loop is broken.
I know it doesn't seem ideal but it works lol
while ($row = mysqli_fetch_assoc($result)) {
if ($row['status'] == "bad") {
$counter += 1;
}
else{
break;}
I will provide an answer just with your output as if it was just one table. It will give you the main ideia in how to solve your problem.
Basically I created a column called ord that will work as a row_number (MySql doesn't support it yet AFAIK). Then I got the minimum ord value for a bad status then I get everything from the data where ord is less than that.
select y.*
from (select ProductID, dt, status, #rw:=#rw+1 ord
from product, (select #rw:=0) a
order by dt desc) y
where y.ord < (select min(ord) ord
from (select ProductID, status, #rin:=#rin+1 ord
from product, (select #rin:=0) a
order by dt desc) x
where status = 'Bad');
Result will be:
ProductID dt status ord
-------------------------------------
1 2017-03-27 Good 1
2 2017-03-27 Good 2
3 2017-03-26 Good 3
Also tested with the use case where the Bad status is the first result, no results will be returned.
See it working here: http://sqlfiddle.com/#!9/28dda/1
I was given a task to show the CPU usage trend as part of a building process which also do regression test.
Each individual test case run has a record in the table RegrCaseResult. The RegrCaseResult table looks something like this:
id projectName ProjectType returnCode startTime endTime totalMetrics
1 'first' 'someType' 16 'someTime' 'someOtherTime' 222
The RegrCaseResult.totalMetrics is a special key which links to another table called ThreadMetrics through ThreadMetrics.id.
Here is how ThreadMetrics will look like:
id componentType componentName cpuTime linkId
1 'Job Totals' 'Job Totals' 'totalTime' 34223
2 'parser1' 'parser1' 'time1' null
3 'parser2' 'generator1' 'time2' null
4 'generator1' 'generator1' 'time3' null
------------------------------------------------------
5 'Job Totals' 'Jot Totals' 'totalTime' 9899
...
The rows with the compnentName 'Job Totals' is what the totalMetrics from RegrCaseResult table will link to and the 'totalTime' is what I am really want to get given a certain projectType. The 'Job Totals' is actually a summation of the other records - in the above example, the summation of time1 through time3. The linkId at the end of table ThreadMetrics can link back to RegrCaseResult.id.
The requirements also states I should have a way to enforce the condition which only includes those projects which have a consistent return code during certain period. That's where my initial question comes from as follows:
I created the following simple table to show what I am trying to achieve:
id projectName returnCode
1 'first' 16
2 'second' 16
3 'third' 8
4 'first' 16
5 'second' 8
6 'first' 16
Basically I want to get all the projects which have a consistent returnCode no matter what the returnCode values are. In the above sample, I should only get one project which is "first". I think this would be simple but I am bad when it comes to database. Any help would be great.
I tried my best to make it clear. Hope I have achieved my goal.
Here is an easy way:
select projectname
from table t
group by projectname
having min(returncode) = max(returncode);
If the min() and max() values are the same, then all the values are the same (unless you have NULL values).
EDIT:
To keep 'third' out, you need some other rule, such as having more than one return code. So, you can do this:
select projectname
from table t
group by projectname
having min(returncode) = max(returncode) and count(*) > 1;
select projectName from projects
group by projectName having count(distinct(returnCode)) = 1)
This would also return projects which has only one entry.
How do you want to handle them?
Working example: http://www.sqlfiddle.com/#!2/e7338/8
This should do it:
SELECT COUNT(ProjectName) AS numCount, ProjectName FROM (
SELECT ProjectName FROM Foo
GROUP BY ProjectName, ReturnCode
) AS Inside
GROUP BY Inside.ProjectName
HAVING numCount = 1
This groups all the ProjectNames by their names and return codes, then selects those that only have a single return code listed.
SQLFiddle Link: http://sqlfiddle.com/#!2/c52b6/11/0
You can try something like this with Not Exists:
Select Distinct ProjectName
From Table A
Where Not Exists
(
Select 1
From Table B
Where B.ProjectName = A.ProjectName
And B.ReturnCode <> A.ReturnCode
)
I'm not sure exactly what you're selecting, so you can change the Select statement to what you need.
I thought I had a very simple query to perform, but I can't seem to make it work.
I have this table with 2 columns:
version_id trim_id
1 15
1 25
1 28
1 30
1 35
2 12
2 25
2 33
2 48
3 11
3 25
3 30
3 32
I am trying to get any version-id's that have say a sub-set of trim_id's. Let's say all version_id's that have trim_id's 25 and 30. My obvious attempt was :
SELECT * FROM table WHERE trim_id=25 AND trim_id=30
I was expecting to have version_id 1 and 3 as a result, but instead I get nothing.
I am working with the latest version of MAMP, which has some odd behavior, like in this case it just tells me its 'LOADING' and never gives me an error message or something. But that's normally the case when there is no data to return.
This is InnoDB, if that helps.
Thanks for your input.
Your query does not work because you are using AND and the trim_id cannot have two different values at the same time, so you need to apply Relational Division to get the result.
You will need to use something similar to the following:
SELECT version_id
FROM yourtable
WHERE trim_id in (25, 30)
group by version_id
having count(distinct trim_id) = 2
See SQL Fiddle with Demo.
This will return the version_id values that have both 25 and 30. Then if you wanted to include additional columns in the final result, you can expand the query to:
select t1.version_id, t1.trim_id
from yourtable t1
where exists (SELECT t2.version_id
FROM yourtable t2
WHERE t2.trim_id in (25, 30)
and t1.version_id = t2.version_id
group by t2.version_id
having count(distinct t2.trim_id) = 2);
See SQL Fiddle with Demo
SELECT *
FROM table
WHERE trim_id IN(25,30)
I am trying to query a database to find the following.
If a customer searches for a hotel in a city between dates A and B, find and return the hotels in which rooms are free between the two dates.
There will be more than one room in each room type (i.e. 5 Rooms in type A, 10 rooms in Type B, etc.) and we have to query the database to find only those hotels in which there is at least one room free in at least one type.
This is my table structure:
**Structure for table 'reservations'**
reservation_id
hotel_id
room_id
customer_id
payment_id
no_of_rooms
check_in_date
check_out_date
reservation_date
**Structure for table 'hotels'**
hotel_id
hotel_name
hotel_description
hotel_address
hotel_location
hotel_country
hotel_city
hotel_type
hotel_stars
hotel_image
hotel_deleted
**Structure for table 'rooms'**
room_id
hotel_id
room_name
max_persons
total_rooms
room_price
room_image
agent_commision
room_facilities
service_tax
vat
city_tax
room_description
room_deleted
And this is my query:
$city_search = '15';
$check_in_date = '29-03-2010';
$check_out_date = '31-03-2010';
$dateFormat_check_in = "DATE_FORMAT('$reservations.check_in_date','%d-%m-%Y')";
$dateFormat_check_out = "DATE_FORMAT('$reservations.check_out_date','%d-%m-%Y')";
$dateCheck = "$dateFormat_check_in >= '$check_in_date' AND $dateFormat_check_out <= '$check_out_date'";
$query = "SELECT $rooms.room_id,
$rooms.room_name,
$rooms.max_persons,
$rooms.room_price,
$hotels.hotel_id,
$hotels.hotel_name,
$hotels.hotel_stars,
$hotels.hotel_type
FROM $hotels,$rooms,$reservations
WHERE $hotels.hotel_city = '$city_search'
AND $hotels.hotel_id = $rooms.hotel_id
AND $hotels.hotel_deleted = '0'
AND $rooms.room_deleted = '0'
AND $rooms.total_rooms - (SELECT SUM($reservations.no_of_rooms) as tot
FROM $reservations
WHERE $dateCheck
GROUP BY $reservations.room_id) > '0'";
The number of rooms already reserved in each room type in each hotel will be stored in the reservations table.
The thing is the query doesn't return any result at all. Even though it should if I calculate it myself manually.
I tried running the sub-query alone and I don't get any result. And I have lost quite some amount of hair trying to de-bug this query from yesterday. What's wrong with this? Or is there a better way to do what I mentioned above?
Edit: Code edited to remove a bug. Thanks to Mark Byers.
Sample Data in reservation table
1 1 1 2 1 3 2010-03-29 2010-03-31 2010-03-17
2 1 2 3 3 8 2010-03-29 2010-03-31 2010-03-18
5 1 1 5 5 4 2010-03-29 2010-03-31 2010-03-12
The sub-query should return
Room ID : 1 Rooms Booked : 7
Room ID : 2 Rooms Booked : 8
But it does not return any value at all.... If i remove the dateCheck condition it returns
Room ID : 2 Rooms Booked : 8
Your problem is here:
$rooms.total_rooms - (SELECT SUM($reservations.no_of_rooms) as tot,
$rooms.room_id as id
FROM $reservations,$rooms
WHERE $dateCheck
GROUP BY $reservations.room_id) > '0'"
You are doing a subtraction total_rooms - (tot, id) where the first operand is a scalar value and the second is a table with two columns. Remove one of the columns in the result set and make sure you only return only one row.
You also should use the JOIN keyword to make joins instead of separating the tables with commas. That way you won't forget to add the join condition.
You probably want something along these lines:
SELECT column1, column2, etc...
FROM $hotels
JOIN $rooms
ON $hotels.hotel_id = $rooms.hotel_id
JOIN (
SELECT SUM($reservations.no_of_rooms) as tot,
$rooms.room_id as id
FROM $reservations
JOIN $rooms
ON ??? /* Aren't you missing something here? */
WHERE $dateCheck
GROUP BY $reservations.room_id
) AS T1
ON T1.id = room_id
WHERE $hotels.hotel_city = '$city_search'
AND $hotels.hotel_deleted = '0'
AND $rooms.room_deleted = '0'
AND $rooms.total_rooms - T1.tot > '0'