I'm trying to use two name column's in tables and find the similarities/differences using SQL Server. I would like to print a list of students Table 1 that are not present in Table 2, along with all their respective scores and grade. However I am having trouble populating multiple columns with my current script. My script does not populate the test scores but instead prints only NULL values. I've included the table format's and where I am with my both script's so far. Right now, all the score fields are printing NULL values even when they have populated fields in Table2.
TABLE_1_Today's_List
Name1
Kevin
James
Roger
Bob
TABLE_2_Combined_Scores
Name2
Grade
Score_1
Score_2
Score_3
Score_4
Kevin
10
25
34
12
45
Bob
9
25
23
65
87
Roger
10
43
54
25
98
James
12
43
54
25
98
Students in Table 1 that are also in Table 2:
SELECT c.Name1, Score_1,Score_2,Score_3,Score_4
FROM TABLE_1_Today's_List c
WHERE EXISTS (SELECT c2.Name2,Score_1,Score_2,Score_3,Score_4
FROM TABLE_2_Combined_Scores c2
WHERE c2.Name2 = c.Name1
and Grade = '10');
^This script returns NULL values for all the Score fields but correctly maps the students in both tables. I would like to populate the the Score fields with the results from Table2
Students in Table 1 that are not in Table 2:
SELECT c.Name1, Score_1,Score_2,Score_3,Score_4
FROM TABLE_1_Today's_List c
WHERE NOT EXISTS (SELECT c2.Name2,Score_1,Score_2,Score_3,Score_4
FROM TABLE_2_Combined_Scores c2
WHERE c2.Name2 = c.Name1
and Grade = '10');
^This script returns NULL values for all the Score fields but correctly maps the students in table1 but not table2. I would like to populate the the Score fields with the results from Table2
Ideal Output:
Name1
Score_1
Score_2
Score_3
Score_4
Kevin
25
34
12
45
Roger
43
54
25
98
Related
I want to link different ids through the common interactor. It is bit complex but i will try my best to frame the problem.
Here are the list of steps
1. Extract id from table A.
Table A
ID Interactor
1 30
2 40
Get the list of interactors corresponding to id from table B. for example,
select * from table B where id = 1
Table B
ID Interactors
1 30
1 32
1 33
1 36
1 38
1 39
Iterate through each interactor from the list and get the list of ids from table A.
Table A
ID Interactors
1 30
70 32
76 33
Null 36
89 38
75 39
2 45
2 40
2 43
4.Join these different ids so that when i select 1 i should get the below result.
Select * where id = 1
Result
ID Interactors
1 30
70 32
76 33
89 38
75 39
I want to achieve this using sql.
Try this:
select B.ID, B.Interactors
from A inner join B
where A.Interactors = B.Interactors
and A.ID = 1
From step 3 you have table A, and before that you have table B.
You can use simple inner join with some where condition to get your desired result.
Select Id, Interactors from
( select tableA.id, tableA.Interactors
from tableA
inner join tableB
on tableA.Interactors = tableB.Interactors
and tableA.Id is not null --- this is required since in your output record having NULL id correspond to tableA is not considered
) as db
where db.Id = 1 ---- you can apply any filter over there to get your desired result.
I have 2 tables with identical columns. Is there a way I can append them together. For example if my tables are:
Table 1:
ID Age
1 21
2 26
3 19
4 40
Table 2:
ID Age
6 29
8 40
10 35
I'd like the desired output to be:
ID Age
1 21
2 26
3 19
4 40
6 29
8 40
10 35
Is there a way I can append these 2 tables. Being new to SQL I tried using insert but couldn't do much about it.
Would be great if some one can help out
You can use a UNION ALL query:
SELECT ID, Age
FROM table1
UNION ALL
SELECT ID, Age
FROM table2
This will return all rows from each table in a single result. Here is a demo.
Use Union rather Union All if you want unique values based on two tables.
https://stackoverflow.com/a/49928/2745294
SELECT ID, Age
FROM table1
UNION
SELECT ID, Age
FROM table2
I have an old database with some complex joining of the data. As given below
Subjects
Id Name
-------------------------------
1 Math
2 Science
3 English
Results
Id StudentId Math MathMax Science ScienceMax English EnglishMax TotalMarks Max
-----------------------------------------------------------------------------------------
1 81 5 10 6 10 3 10 14 30
2 82 8 10 8 10 9 10 25 30
3 83 7 10 8 10 7 10 22 30
Now I am trying to convert it to more easy and readable database. So I come up with the tables like
Results
ResultId StudentId TotalMarks MaxMarks
-------------------------------------------
1 81 14 30
2 82 25 30
3 83 22 30
ResultDetails
Id ResultId SubjectId Marks MaxMarks
--------------------------------------------------------
1 1 1 5 10
2 1 2 6 10
3 1 3 7 10
& so one
Now the real question I can insert data in the new Results table but I am confused on the second table. I can't understand that how to pass column name of one table and get the id of that name from second table and insert it in the third one.
I am trying on but can't understand the right commands to achieve this. My database already have 50000+ records and I have to merge them according to this new tables.
Assuming this is a one-off conversion of data, and you've already populated your new Results table, something as simple as the following should work:
INSERT INTO ResultDetails(ResultId, SubjectId, Marks, MaxMarks)
SELECT
R.StudentId,
1 AS SubjectId,
OldR.Math AS Marks,
OldR.MathMax AS MaxMarks
FROM Results R
INNER JOIN OldResults OldR ON R.StudentId = OldR.StudentId
INSERT INTO ResultDetails(ResultId, SubjectId, Marks, MaxMarks)
SELECT
R.StudentId,
2 AS SubjectId,
OldR.Science AS Marks,
OldR.ScienceMax AS MaxMarks
FROM Results R
INNER JOIN OldResults OldR ON R.StudentId = OldR.StudentId
INSERT INTO ResultDetails(ResultId, SubjectId, Marks, MaxMarks)
SELECT
R.StudentId,
3 AS SubjectId,
OldR.English AS Marks,
OldR.EnglishMax AS MaxMarks
FROM Results R
INNER JOIN OldResults OldR ON R.StudentId = OldR.StudentId
It's not a very elegant solution, but it doesn't need to be for a one-off conversion.
I have been trying to devise an SQL query in Access 2010 to count the number of sequential field values which are based over 3 tables using fields with unique ID's
Example
Table1: Course
CorID Date
1 01/01/2012
2 01/03/2012
3 01/02/2012
Table 2: Delegate
DelID StaffID CorID Value CounterField
1 17263 2 99 1
2 17263 1 99 2
3 17263 3 99 3
4 17263 65 4 1
5 17263 44 5 1
6 17263 78 5 2
Table 3: Staff
StaffID Surname
1 Test
2 Smith
17263 Jones
The CounterField increases by 1 where the Value field in Table 2 is the same as the previous Value field. There would be a requirement to ensure that the count only uses the the order based on the course table Date field. The delegate table would also contain more DelID fields than listed and will contain different StaffID values as well.
The CounterField in the above table is an example of what I want the query to be able to do.
Is this possible? Thanks in advance.
If you want to count how many rows you have in Delegate that are not duplicate regarding the Value field:
SELECT count(*)
FROM Delegate
WHERE CounterField = 1
Try running a subquery:
SELECT a.DelID, a.StaffID, a.CorID, a.[Value],
(SELECT Count(*) FROM Delegate b
WHERE b.DelID <= a.DelID AND a.[Value]=b.[Value]) As CounterField
FROM Delegate a;
I am looking for help in writing a query of retrieving the values from 2 tables in MySQL.
The scenario is
Table A
ID Name Marks
===================
23 John 67
45 Mark 45
12 Ram 87
Table B has the following Structure
ID Name Evaluation Marks
==============================
45 Mark 34
78 Chris 09
98 Nancy 10
23 John 12
I am trying to write a query, where if I execute the following query
Select "SOMETHING" from Table A where Id=45
I should get Marks Column as 45+34=79, which should fetch and sum from the both the Tables A and Table B.
If I execute the query with the Id=12.
Since the Id=12, does not exists in the Table B, I should get the Marks as 87.
What would a query for the above?
I assume that the id occurs only once in your tables table a, but could be missing in both. If it always exists in table a, you can use a LEFT JOIN instead of the UNION.
SELECT COALESCE(SUM(marks), 0)
FROM
(
SELECT marks FROM a WHERE id = 45
UNION ALL
SELECT SUM(evaluation_marks) AS marks FROM b WHERE id = 45
) x
Edit
If you have all users in table a, then use
SELECT a.marks + COALESCE( SUM( b.evaluation_marks ), 0 )
FROM a
LEFT OUTER JOIN b ON ( b.id = a.id )
WHERE a.id = 45
GROUP BY a.id, a.marks
You should consider changing your table model though. Why do you store name and id twice? Can't you do it like that:
id name marks evaluation marks
=======================================
12 Ram 87 0
23 John 67 12
45 Mark 45 34
78 Chris 0 9
98 Nancy 0 10