I have a MySQL table from which I want to extract attendance information(Student Id, course/subject for attendance, date range,whether the student was present or not). I have written the following query:
SELECT
COUNT(a_id),
(
SELECT COUNT(*) FROM attendance
WHERE state = 'present'
AND `dater` BETWEEN '$a' AND '$b'
) AS Count,
stud_id
FROM attendance
WHERE
stud_id =(SELECT id FROM users WHERE NAME = '$stud')
Which is giving me the correct results, but when I change the student,its not giving me the correct count for the days recorded for present. Not mention that I have not yet added the course parameter into the query
The MySQL table is as follows:
I need help for the query to return the desired results(Count the accurate days present for each student, as well as adding the course parameter into the query so that the query will look for attendance records for a specific course, for a specific student, for a specified date range).
Looks like you want to seperate your queries:
Select (select count(*) from <database>.attendance where state = 'present' AND (dater between '$a' and '$b') AND name=(SELECT id FROM users WHERE NAME = '$stud')) as present, (select count(*) from <database>.attendance where state = 'absent' AND (dater between '$a' and '$b') AND name=(SELECT id FROM users WHERE NAME = '$stud')) as absent from <database>.attendance WHERE stud_id =(SELECT id FROM users WHERE NAME = '$stud');
try this :)
Resolved it using JOIN as follows:
SELECT u.id, a.stud_id, a.course_id, count(*) FROM attendance a
JOIN users u ON u.id=a.stud_id
JOIN courses c ON c.c_id=a.course_id
WHERE a.state='present' and dater between '2017-09-01' and '2017-09-14'
GROUP BY a.stud_id, a.course_id;
Thanks for your help.
Related
I have two tables, one for registered users and one to store votes.
We are logging in with registrants.id and registrants.zipcode. Once they vote their votes are inserted into the votes table, along with their Registration ID.
Im trying to right a select statement that returns a record that will select all the records for Matched ID and Zipcode, but the ID is not in the Votes.voter column. i have tried all kinds of variations of all the joins i can think of. is it something simple i am missing.
SELECT * FROM registrants
LEFT JOIN votes on registrants.id = votes.voter
WHERE registrants.id = 1 AND registrants.zipcode = 46706 and votes.voter <> 1
Perhaps a not exists query:
select * from registrants
where registrants.zipcode = '46706'
and not exists (select 1 from votes where registrants.id = votes.voter)
I have users with different group code in my MySQL database. I am saving their latitude and longitude in database according to their current positions.
Problem is I am not able to get their recent records according to their group code.
I have tried this
SELECT * FROM tracklatlong WHERE id IN (SELECT MAX( id ) FROM
tracklatlong GROUP BY 'track_CfiUw');
but i am only getting last record of this track_CfiUw group code.
i want result like below
Your query should be like,
SELECT tl1.id,tl1.admin_id,tl1.name,tl1.groupcode
FROM tracklatlong tl1
LEFT JOIN tracklatlong tl2 ON (tl1.name = tl2.name AND tl1.id < tl2.id)
WHERE tl2.id IS NULL AND tl1.groupcode = 'track_CfiUw';
But instead you are grouping it by group_code value.
I have a table of hours which looks like :
I want to sum the hours_spent results for this week only and group the results by the created_by person. I have this query which returns the correct data for showing only results in this week :
SELECT staff_id, first_name, last_name, date_entered, `hours_spent` as total_hours FROM hours LEFT JOIN staff ON hours.created_by = staff.staff_id where yearweek(`date_entered`) = yearweek(curdate());
But when I add the SUM(hours_spent) as total_hours and group by staff_id like the example below I get 0 results.
SELECT staff_id, date_entered, first_name, last_name, SUM(`hours_spent`) as total_hours FROM hours LEFT JOIN staff ON hours.created_by = staff.staff_id group by staff_id having yearweek(`date_entered`) = yearweek(curdate());
I'm assuming it's not working because the Having part of my statement doesn't return individual rows of dates so it breaks.
I feel like I am doing this the hard way. Should I be trying to run a second summing query on the results of the first query rather than combine it all into one (I was hoping for cleanliness). Or should I be using a subquery to filter out the dates that aren't this week then group the totals if so how could I accomplish this?
I got what I was expecting with :
SELECT staff.first_name,staff.last_name, sum(hours_spent)
FROM hours
LEFT JOIN staff ON hours.created_by = staff.staff_id
WHERE yearweek(date_entered,1) = (yearweek(curdate(),1)-1)
GROUP BY created_by
Before asking this question, I already search a lot of entries on Google and StockOverflow. Nothing can fulfil my question.
There are two tables - group_sale_bonuses and members. I want to check is already there records with product_id "1" in the group_sale_bonuses.
If not, I want to insert all records from members table into group_sale_bonuses with product_id "1".
My overall requirement is as follow:
IF ((Select count(id) from group_sale_bonuses where product_id = 1) = 0) THEN
INSERT INTO group_sale_bonuses (member_id, product_id, quantity_counter, credit)
SELECT id, 1, 0, 0 FROM members
END IF
But this sql causes the errors.
I know there are solutions about Insert Ignore, Where Not Exists.
But these conditions checking are based on per each record. I have thousands of records in members table. I want to make condition checking just one time like in my above sql example.
By the way, I will use this Sql in Php web application.
You could just set the code in a WHERE clause instead of the IF.
INSERT INTO group_sale_bonuses(
member_id,
product_id,
quantity_counter,
credit)
SELECT
id, 1, 0, 0 FROM members
WHERE(
SELECT
count(id) FROM group_sale_bonuses
WHERE product_id = 1
) = 0;
This should do it for all product_id's
SELECT m.product_id, m.member_id FROM members AS m
LEFT JOIN group_sale_bonuses AS gsb ON gsb.product_id = m.product_id
WHERE gsb.product_id IS NULL ;
You can filter it to a specific product_id by adding to the where clause
SELECT m.product_id, m.member_id FROM members AS m
LEFT JOIN group_sale_bonuses AS gsb ON gsb.product_id = m.product_id
WHERE gsb.product_id IS NULL AND m.product_id = 1;
Take a look at this SQLfiddle: http://sqlfiddle.com/#!2/8482c/2
Im trying to put together a SQL query and its got me all confused, i have written out in normal language what i need, i cant seem to get it.
select * from introles where introle = $key
then check the table 'availability' for the user_id taken from the introles table
then out of those results, check that $_POST['date'] is not equal to the date in the 'availability' table
Any help would be amazing :)
EDIT: The table structure is as follows
Table introles has the following
id
user_id
introle
Table availability has the following
id
user_id
date
can you try
'$variable'
instead of
$variable
for all variables in sql query?
$query = "SELECT a.id AS aId, i.id AS iId, a.user_id, introle, date FROM availability AS a, introle AS i WHERE date != {$_POST['date']} AND a.user_id IN (SELECT user_id FROM introle WHERE introle = {$key})";