I have 2 tables in Access with these fields
Student:
ID(PK) Name Family Tel
Lesson:
ID StudentRef(FK(Student)) Name Score
Imagine we have these records
Student :
1 Tom Allen 09370045230
2 Jim leman 09378031380
Lesson:
1 1 Math 18
2 1 Geography 20
3 2 Economic 15
4 2 Math 12
How can I write a query that result will be this (2 fields)?
Tom Math : 18 , Geography 20
Jim Economic :15 , Math :12
SELECT s.Name, l.Name, l.Score
INNER JOIN tbl_lessons as l ON s.student_id = l.student_id
FROM tbl_students as s
That won't give you your formatting, but it'll get you the data.
The most tricky part of your problem is how to aggregate strings in your sub-query. MS Access does not have any aggregation function that is applicable to strings (except for Count()) and there is no way to define your own function. This means you can't just get the desired "subject:score , subject:score" concanetation. As long as you can go without you can easily take the solution provided in the answer by Corith Malin.
Related
I have 2 tables as follows
Human
id name
1 John
2 mark
Computer
id human_id
1 2
2 null
I want my answer to be as following
name no_of_computer
John 0
mark 1
I tried the following but am wrong
select h.name,c.human_id) as 'no_of_computer' from human h
join
computer c on c.human_id = h.id
group by h.id
my code is not counting the null as 0 so its just avoiding that and only showing that mark has 1 computer, but I want to see John has 0 computer too. please help me out, thanks in advance
You can use a subquery that's something like:
SELECT
h.Name,
(SELECT COUNT(c.id_of_computers)
FROM computers c
WHERE c.id_human = h.id) as no_of_computer
FROM humans h
Do not cut and paste this to test, as I paid no attention to actual ID names in your tables. You'll have to look at that. 👍
I'm just learning PHP and MySQL and I have two tables in the same database : FirstYear , SecondYear that have a structure like this :
StudentId |Math | Physics StudentId1 | Math1 | physics1
Joe 10 14 Alan 12 17
Alan 13 17 Smith 11 13
Smith 9 9 Joe 10 15
Is it possible to write a query that select and compare the two columns StudentId , StudentId1 to find matched records and if for example Joe=Joe after that compare records of math with math1 and physics with physics1 that are in the same row as matched records of StudentId with StudentId1 ;the idea of this query is to study the improvement of same student from first year to the second one ,Thanks .
Yes, it is possible but you have to complete SQL fundamental course.
In this situation you have to know about JOIN. Such as, Inner Join, Left Join, Right Join, Full Join etc. Also, compare with unique id, not name. Because, name always duplicate. It is not good practice. So, Know about primary key and foreign key.
However,
Query-
SELECT * FROM FirstYear INNER JOIN SecondYear ON FirstYear.StudentId = SecondYear.StudentId1 WHERE FirstYear.id = 1
Something like that, alternatively, you can try to another logic.
I have a this Table in MS Access:
Table1
ID EMP ROLE ASSESS
1 JOE Weld 4
2 TOM Weld 4
3 JIM Ship 4
4 PAT Ship 3
5 JAY Weld 4
6 TIM Ship 4
"ROLE" is short text and "ASSESS" is a number field. "ASSESS" is assessing employees' roles on a scale of 1-4. I want to collect and total assessments that are "4" for each role.
Returning something like:
ROLE TOTAL
Weld 3
Ship 2
I however have around 100 different roles that I am needing to do this with. Is there a way with SQL or a combination of query and macro to make this work? I am at a loss.
Thank you.
You could use a where clause to filter just the the assesses that are 4 and a group by clause to aggregate them:
SELECT role, COUNT(*)
FROM table
WHERE assess = 4
GROUP BY role
Not sure what exactly it is I should be looking for, so I'm reaching out for help.
I have two tables that through queries I need to spit out one. the two tables are as follows:
Transactions:
TransactionID SiteID EmployeeName
520 2 Michael
521 3 Gene
TransactionResponse:
TransactionID PromptMessage Response PromptID
520 Enter Odometer 4500 14
520 Enter Vehicle ID 345 13
521 Enter Odometer 5427 14
521 Enter Vehicle ID 346 13
But what I need is the following, let's call it TransactionSummary:
TransactionID SiteID EmployeeName 'Odometer' 'VehicleID'
520 2 Michael 4500 345
521 3 Gene 5427 346
The "PromptID" column is the number version of "PromptMessage" so I could query off that if it's easier.
A good direction for what this query would be called is the least I'm hoping for. True extra credit for working examples or even using this provided example would be awesome!
For a predefined number of possible PromptID values you can use something like the following query:
SELECT t.TransactionID, t.SiteID, t.EmployeeName,
MAX(CASE WHEN PromptID = 13 THEN Response END) AS 'VehicleID',
MAX(CASE WHEN PromptID = 14 THEN Response END) AS 'Odometer'
FROM Transactions AS t
LEFT JOIN TransactionResponse AS tr
ON t.TransactionID = tr.TransactionID AND t.SiteID = tr.SiteID
GROUP BY t.TransactionID, t.SiteID, t.EmployeeName
The above query uses what is called conditional aggregation: a CASE expression is used within an aggregate function, so as to conditionally account for a subset of records within a group.
id_no doc_id item_no product customer
123 2 1 A Daisy
123 2 9 A Ben
123 4 3 A Daisy
123 4 4 A Ben
123 6 11 B Daisy
123 6 13 B Ben
when I put it in my report it results to
Daisy Daisy
Ben
And it is also the result in mysql
select distinct customer from receipt where id_no like '123'
result:
Daisy
Daisy
Ben
Another query that I tried:
select distinct id_no, customer, product from receipt where id_no like '123'
result:
123 Daisy A
123 Daisy B
123 Daisy A
123 Ben A
123 Ben B
desired result:
Daisy
Ben
Please help me please.
Thank you guys for the help I found out why the other one keeps on showing. It is because the other Daisy is spelled as Daissy that's why.
Most likely your Customer name contains additional characters between the two records. Depending on how the datatype is implemented, spaces could matter and have contributed to the difference.
Try concatenating a character before and after customer.
I am unfamiliar with the concepts in Crystal Reports, but from what I understand, you would have to create a formula like so:
"XXX" & {Receipt.Customer} & "XXX"
If you run it again, you might recognize there is additional space like so:
XXXDaisyXXX
XXXDaisy XXX
^____ Additional Space
There is no chance of error while you using distinct ..it should return distinct value ...any way you can try another way
SELECT customer FROM receipt WHERE id_no like '123' GROUP BY customer
I don't see why you are fetching three records. I tried implementing your database and ran your query. It returned the result as expected.
See the above pic. There may be some issue with the data type you used. You may try grouping via customer, but I don't think it should affect your result anyway.
Also Check if the data types match.
The selection you made from customer id and id_no is unique and with distinct it should return only two rows
plase try this code
i get solution
select distinct `customer` from receipt where `id_no`='123'
this is right
i tryied this is my past project
best of luck