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I have a table(quiz). And the fields are id,question,answer, and level.
There Many questions for level 1, many questions for level 2 and so on. Please how do i query 10 rows based on the levels consecutively i.e
question1(level 1)
question2(level 2)
question3(level 3)
..to
question10(level 10)
this is what i have so far:
$con->prepare("SELECT*FROM quiz WHERE level IN (1,2,3,4,5.....10) limit 0,10");
but the result i get is only 10 questions on level 1. Please i also want it to be random
Here's an attempt, though perhaps it needs a subquery:
SELECT * FROM quiz
WHERE level BETWEEN 1 AND 10
GROUP BY level
ORDER BY RAND(), level
Second attempt:
SELECT * FROM
(
SELECT * FROM quiz
WHERE level BETWEEN 1 AND 10
ORDER BY RAND()
) tmp
GROUP BY level
ORDER BY level
Related
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I will developing e-commerce website but need some help from you.
When I run query "SELECT * FROM products_variations_option WHERE variations_id IN (31,41) ORDER BY product_variations_id ASC" then I am gating this output but I need 1 and second row, Means I want only product_variations_id= 75 because 31 and 41 both value found in only product_variations_id=75
The below query may give you desired output
SELECT variations_id, product_variations_id
FROM (SELECT *
FROM products_variations_option
WHERE variations_id IN (31,41)
ORDER BY product_variations_id ASC
) as t
GROUP BY variations_id
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I have tried writing the below query but i just need 3 winners(1st,2nd and 3rd place) and my query has just brought every project in descending order but i need only top 3.
<SELECT judge_review.sub_ID, SUM(judge_review.avgPoints) AS TOTAL FROM judge_review GROUP BY judge_review.sub_ID ORDER BY TOTAL DESC>
You need to apply LIMIT 3
SELECT judge_review.sub_ID,
SUM(judge_review.avgPoints) AS TOTAL
FROM judge_review
GROUP BY judge_review.sub_ID
ORDER BY TOTAL DESC
LIMIT 3
Reference:- Limit Data Selections From a MySQL Database
To limit number of returned rows in the result set you have to specify number of that rows by adding to the end of the query LIMIT 3.
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Just as the title says, I need a query to count the rows until the condition is met. Here's my setup:
partnumber
-----------
b
e
d
a
c
So if I'm going to search for partnumber = d it will sort the part number and return 4 (since d is the 4th when you sort the partnumber).
I can do this inside a loop. I'm just wondering if there is a query for this.
Thanks in advance
SELECT COUNT(*) FROM THE_TABLE WHERE partnumber <= (SELECT ID FROM THE_TABLE WHERE partnumber <= 'd');
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I have about 30 000 records in database, and I must create 10 cron jobs for these:
job 1 fetches records where column `id` is 0,10,20,30, etc.
job 2 fetches records where column `id` is 1,11,21,31, etc.
and so forth.
How can I approach this?
Use the modulo operator
select * from your_table
where id % 10 = 1
to get 1,11,21,31,... and so on. And
where id % 10 = 2
for 2,12,22,32,....
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I'm making a little voting tool (voting from 1 to 5) and I have the votes stored in a DB. I'm wondering, what is the best manner to count all the rows (of a specific post ID) and then calculate the sum of those specific rows so that I can display the results.
i.e
Results: 3.5 / 5
(total votes: 1047)
Should I use a PHP loop or MYSQL sum?
SELECT AVG(vote), COUNT(vote) FROM vote_table WHERE post_id = 1234;
The first. column gives your average out of 5 and the count the total votes. To get all the stats at once:
SELECT AVG(vote), COUNT(vote), post_id FROM vote_table GROUP BY post_id;