Evenly distribute rows withing a group - mysql

Suppose I have a table ITEMBANKITEMASSOCIATION as
ID FKITEMBANKID FKITEMID
1 1 100
2 2 101
3 2 102
4 2 103
5 2 104
6 3 105
7 3 106
8 4 107
9 4 108
10 4 109
11 4 110
12 4 111
I want to select 10 rows but rows must to evenly distributed within FKITEMBANKID. That Means suppose I want 10 rows to select within 4 item banks, so 10/4 gives 2 items from each Item banks. This I have achieved by query
SELECT ITEMBANKITEMASSOCIATION.*
FROM ITEMBANKITEMASSOCIATION INNER JOIN (
SELECT inIBA.FKITEMBANKID, GROUP_CONCAT(inIBA.FKITEMID) grouped_year
FROM ITEMBANKITEMASSOCIATION inIBA
GROUP BY inIBA.FKITEMBANKID) group_max
ON ITEMBANKITEMASSOCIATION.FKITEMBANKID = group_max.FKITEMBANKID
AND FIND_IN_SET(ITEMBANKITEMASSOCIATION.FKITEMID, grouped_year) between 1 and 2
ORDER BY
ITEMBANKITEMASSOCIATION.FKITEMBANKID DESC;
Fiddle is here
Result of this query gives only 7 rows, because this query select rows from each group (itembank) between 1 and 2. Still 3 rows are need to be pulled, how I can pull remaining 3 rows by distributing it in available itembanks? Available itembanks means after fetching first 7 exclude the pulled items and re-distribute within remaining banks.

Related

Sum of all child and assign to parent in hierarchical data in MySql

I have a 2 Mysql tables like 1.Product(This table is hierarchical or recursive) and 2.Sales table in this will store sale id and product id. I need to show parent product with the sum of all hierarchical child product.
Product table having data like,
id name parent_id
1 Necklace NULL
2 Ring NULL
3 Earing NULL
4 Choker 1
5 Long Necklace 1
6 Short Necklace 1
7 2-Line 5
8 3-Line 5
9 Mango 5
10 Green 7
11 Red 7
12 White 7
13 Stud 3
Sales table will have data like,
id product_id no_of_pcs weight rate
1 10 5 40 35000
2 12 8 50 50000
3 9 2 20 25000
4 6 1 8 25000
5 13 2 16 22000
Now I'm trying the result as,
Product sale_pcs tot_pcs sale_wt sale_rate
1 Necklace 16 118 135000
3 Earing 2 16 22000
Now I'm using mysql query inside php recursive function by using product table. By using this even recursive function all the products need to check with sales table. This will happening performance issue. Could you please help any one to solve this issue whether this possible by doing in query itself

Count(*) MySQL - Need to display how many entities have a count of 4 or higher

I have a linking table in MySQL which has the id's of people in one column and the id's of media that they have appeared in.
I have run a query:
SELECT person_id,COUNT(*)
FROM person_media
GROUP BY person_id;
This has returned:
person_id COUNT(*)
1 7
2 4
3 9
4 5
5 9
6 12
7 12
8 3
9 1
10 8
11 8
12 9
13 3
14 1
15 4
16 3
17 3
18 1
19 8
20 1
21 4
What I am looking to do is to count how many people have a COUNT(*) of 4 or more. I can't seem to find a way to do it, but I know it has to be possible. I'm relatively new to MySQL, so be gentle :)

Just use HAVING
SELECT person_id,COUNT(*)
FROM person_media
GROUP BY person_id
HAVING COUNT(*)>=4

The inner query gets all those with a count of 4 and more.
The outer query counts how many that are:
select count(*)
from
(
SELECT 1
FROM person_media
GROUP BY person_id
HAVING count(*) >= 4
) tmp

MYSQL I am trying to return a value where I need to compare one value against the minimum value for the same field when grouped against another field

Basically I am trying to calculate shots received in golf for various four balls, here is my data:-
DatePlayed PlayerID HCap Groups Hole01 Hole02 Hole03 Shots
----------------------------------------------------------------------
2018-11-10 001 15 2 7 3 6
2018-11-10 004 20 1 7 4 6
2018-11-10 025 20 2 7 4 5
2018-11-10 047 17 1 8 3 6
2018-11-10 048 20 2 8 4 6
2018-11-10 056 17 1 6 3 5
2018-11-10 087 18 1 7 3 5
I want to retrieve the above lines with an additional column which is to be calculated depending on the value in the group column, which is the players (Handicap - (the lowest handicap in the group)) x .75
I can achieve it in a group by but need to aggregate everything, is there a way I can return the value as above?, here is query that returns the value:
SELECT
PlayerID,
MIN(Handicap),
MIN(Hole01) AS Hole01,
MIN(Hole02) AS Hole02,
MIN(Hole03) AS Hole03,
MIN(CourseID) AS CourseID,
Groups,
ROUND(
MIN((Handicap -
(SELECT MIN(Handicap) FROM Results AS t
WHERE DatePlayed='2018-11-10 00:00:00' AND t.Groups=Results.Groups)) *.75))
AS Shots
FROM
Results
WHERE
Results.DatePlayed='2018=11=10 00:00:00'
GROUP BY
DatePlayed, Groups, PlayerID
.
PlayerID MIN(Handicap)Hole01 Hole02 Hole03 CourseID Groups Shots
-----------------------------------------------------------------
4 20 7 4 6 1 1 2
47 17 8 3 6 1 1 0
56 17 6 3 5 1 1 0
87 18 7 3 5 1 1 1
1 15 7 3 6 1 2 0
25 20 7 4 5 1 2 4
48 20 8 4 6 1 2 4
Sorry about any formatting really couldn't see how to get my table in here, any help will be much appreciated, I am using the latest mysql from ubuntu 18.04

Not an answer; too long for a comment...
First off, I happily know nothing about golf, so what follows might not be optimal, but it must, at least, be a step in the right direction...
A normalized schema might look something like this...
rounds
round_id DatePlayed PlayerID HCap Groups
1 2018-11-10 1 15 2
2 2018-11-10 4 20 1
round_detail
round_id hole shots
1 1 7
1 2 3
1 3 6
2 1 7
2 2 4
2 3 6

Hi Guys I have found the solution, basically I need to drop the MIN immediately after the ROUND of the equation and therefore it does not need a Group By.
SELECT
PlayerID,
Handicap,
Hole01,
Hole02,
Hole03,
CourseID,
Groups,
ROUND((Handicap -
(SELECT MIN(Handicap) FROM Results AS t
WHERE DatePlayed='2018-11-10 00:00:00'
AND t.Groups=Results.Groups))
*.75) AS Shots
FROM
Results
WHERE
Results.DatePlayed='2018=11=10 00:00:00'

Is it possible to display this data horizontally in SSRS?

I have a table that that is being joined by another table that looks like this:
Id Score Total
1 10 30
1 7 30
1 13 30
2 14 27
2 10 27
2 3 27
I want to be able to display this data like this in SSRS:
Id 1 2 3 Total
1 10 7 13 30
2 14 10 3 27
Can this be done and how?

You can do this by using a matrix.
You can add a row identifier for each id in your dataset (assuming you can modify the dataset, as you joined 2 tables). Below code is for SQL Server (T-SQL).
Select Id, Score, row_number() over (partition by id order by score) ident
from table
Output:
Id Score Ident
1 10 1
1 7 2
1 13 3
2 14 1
2 10 2
2 3 3
No need of the Total field, you can add it in matrix (Right Click on ColumnGroup>Add Total>After).
Use the above query in Matrix as shown below.

Alternative to Group by in SQL

Colummn1 Column2
----------------------------
5 24
5 20
5 13
----------------------------
2 3
----------------------------
3 25
----------------------------
1 4
----------------------------
2 6
2 42
----------------------------
5 23
5 10
----------------------------
Output should be
5 57
2 3
3 25
1 4
2 48
5 33
I have two columns. I want to sum the elements of second column when the values of column 1 are same and consecutive. ie I dont want the grouped sum to contain sum of both segments of 5.
I know how to use Group by clause bit that would aggregate the two segments. Please help me write SQL query for this .