We have to find count for each risk category for impact level as shown in last result part
Risk Table
RiskID RiskName
----------------------
1 Risk1
2 Risk2
3 Risk3
4 Risk4
5 Risk5
6 Risk6
7 Risk7
8 Risk8
9 Risk9
10 Risk10
11 Risk11
Category Table
Cat_ID Cat_Name
--------------------------
1 Design
2 Operation
3 Technical
Risk_Category table
Risk_ID Category_ID
------------------------
1 1
1 2
2 1
3 1
3 3
4 1
5 2
6 1
7 3
8 1
9 3
10 3
Risk_Impact_Assessment table
Risk_ID Impact_Level Impact_Score
---------------------------------------------
1 High 20
2 Medium 15
3 High 20
4 Low 10
5 High 20
6 High 20
7 High 20
8 Low 10
9 Medium 15
10 Low 15
11 Medium 15
Result should be like this
Cat_Name Impact_Level_High Impact_Level_Medium Impact_Level_Low
-------------------------------------------------------------------------------------
Design 1 1 2
Operation 2
Technical 2 2 1
You probably want to use the group by clause, along with case, eg.:
select
Cat_Name,
sum(case when Impact_Level = 'High' then 1 else 0 end) as [Impact_Level_High],
sum(case when Impact_Level = 'Medium' then 1 else 0 end) as [Impact_Level_Medium],
sum(case when Impact_Level = 'Low' then 1 else 0 end) as [Impact_Level_Low]
from [Risk_Impact_Assessment]
...
group by Cat_Name;
(I left out all the joins, I assume you can write these no problem)
You can use this trick to accomplish a lot of cool things, including parametric sorting and (just like here) complicated aggregate functions with little work.
Related
I have a SQLite database that models Sanskrit nouns and has tables like this: (Sorry if it is very lengthy. I've tried to cut things down to the minimum necessary to understand this problem.)
numbers:
id
number
1
singular
2
dual
3
plural
cases:
id
case
1
nominative
2
accusative
3
instrumental
4
dative
5
ablative
6
genitive
7
locative
8
vocative
nouns:
id
name
1
rAma
forms:
id
form
noun
1
rAmaH
1
2
rAmau
1
3
rAmAH
1
4
rAmam
1
5
rAmAN
1
6
rAmENa
1
7
rAmAbhyAm
1
8
rAmaiH
1
9
rAmAya
1
10
rAmebhyaH
1
11
rAmAt
1
12
rAmasya
1
13
ramayoH
1
14
rAmANAm
1
15
rAme
1
16
rAmeShu
1
17
rAma
1
noun is a foreign key which references nouns(id)
nounforms:
id
form
case
number
noun
1
1
1
1
1
2
2
1
2
1
3
3
1
3
1
4
4
2
1
1
5
2
2
2
1
6
5
2
3
1
7
6
3
1
1
8
7
3
2
1
9
8
3
3
1
10
9
4
1
1
11
7
4
2
1
12
10
4
3
1
13
11
5
1
1
14
7
5
2
1
15
10
5
3
1
16
12
6
1
1
17
13
6
2
1
18
14
6
3
1
19
15
7
1
1
20
13
7
2
1
21
16
7
3
1
22
17
8
1
1
23
2
8
2
1
24
3
8
3
1
form is a foreign key which references forms(id)
case is a foreign key which references cases(id)
number is a foreign key which references numbers(id)
noun is a foreign key which references nouns(id)
I can get all the declensions of the noun rAma with this SQL query:
SELECT forms.form FROM forms JOIN nouns,nounforms
WHERE forms.id = nounforms.form
AND nounforms.noun = nouns.id
AND noun.name = "rAma"
GROUP BY nounforms.case, nounforms.number;
and that returns the whole noun perfectly in 24 rows:
form
rAmaH
rAmau
rAmAH
rAmam
rAmau
rAmAN
rAmENa
rAmAbhyAm
rAmaiH
rAmAya
rAmAbhyAm
rAmebhyaH
rAmAt
rAmAbhyAm
rAmebhyaH
rAmasya
ramayoH
rAmANAm
rAme
ramayoH
rAmeShu
rAma
rAmau
rAmAH
So far so good. But what I would really like is something like this:
singular
dual
plural
rAmaH
rAmau
rAmAH
rAmam
rAmau
rAmAN
rAmENa
rAmAbhyAm
rAmaiH
rAmAya
rAmAbhyAm
rAmebhyaH
rAmAt
rAmAbhyAm
rAmebhyaH
rAmasya
ramayoH
rAmANAm
rAme
ramayoH
rAmeShu
rAma
rAmau
rAmAH
i.e. 8 rows for each case with 3 columns for each number. The problem is my SQL knowledge is not quite enough to get me there. I think what I want is a view or a virtual table. Is that right? Also once that is solved, I would like to parametrize the query so I can use it for nouns other than rAma but SQLite does not I believe support stored procedures. Is that right? If so, what is the workaround?
Btw, I am aware that I can do the reordering in my application. In fact, that is what I am
doing now but I would like to keep as much centralized in the database as possible so I can port to other languages/environments.
Can anyone help?
You need conditional aggregation:
SELECT MAX(CASE WHEN nf.number = 1 THEN f.form END) singular,
MAX(CASE WHEN nf.number = 2 THEN f.form END) dual,
MAX(CASE WHEN nf.number = 3 THEN f.form END) plural
FROM forms f
JOIN nouns n ON n.id = f.noun
JOIN nounforms nf ON f.id = nf.form AND nf.noun = n.id
WHERE n.name = ?
GROUP BY nf.`case`;
Replace the placeholder ? with the noun that you want.
Also, always use proper joins with ON clauses and aliases for the tables to make the code shorter and more readable.
See the demo.
As you already know, SQLite does not support stored procedures or functions, so probably the best way to use this query is as it is in your app with the the placeholder ? in a prepared statement and pass the value of the noun as a parameter.
I currently have a table that looks like this:
id carrots potatoes
1 10 0
2 0 5
3 0 0
4 15 3
5 13 2
I want to look at customers who ordered both carrots and potatoes. Like this:
id carrots potatoes
4 15 3
5 13 2
1 10 0
2 0 5
3 0 0
I am currently using an ORDER BY where both fields are DESC: ORDER BY potatoes DESC, carrots DESC
The problem is that this isn't always reliable. Right now it works, but in the case of a customer who ordered a lot of potatoes and no carrots, if I arbitrarily switch the order to ORDER BY potatoes DESC, carrots DESC it gives back
id carrots potatoes
2 0 5
4 15 3
5 13 2
1 10 0
3 0 0
What would your approach be?
Code at sqlfiddle here: http://sqlfiddle.com/#!18/60763/2. T-SQL/Microsoft SQL Server Management Studio 2016.
You can use:
order by (case when carrots > 0 then 1 else 0 end) + (case when potatoes > 0 then 1 else 0 end) desc
Or, if that is too much typing:
order by sign(carrots) + sign(potatoes) desc
You can simple do sum :
order by carrots + potatoes desc
I need to create some checks to make sure that students are enrolled in the correct courses with the correct number of units. Here is my SQL at the moment.
SELECT StudentID
,AssessmentCode
,BoardCode
,BoardCategory
,BoardUnits
,sum(cast(boardunits as int)) over (partition by studentid,boardcategory) as UnitCount
,Count(boardcategory) over (partition by studentid) as SubjectCount
FROM uvNCStudentSubjectDetails
where fileyear = 2015
and filesemester = 1
and studentyearlevel = 11
and StudentIBFlag = 0
order by Studentnameinternal,BoardCategory
This gives me the following info...
StudentID AssessmentCode BoardCode BoardCategory BoardUnits UnitCount SubjectCount
61687 11TECDAT 11080 A 2 11 7
61687 11PRS1U 11350 A 1 11 7
61687 11MATGEN 11235 A 2 11 7
61687 11LANGRB 11870 A 2 11 7
61687 11ENGSTD 11130 A 2 11 7
61687 11GEOGEO 11190 A 2 11 7
64549 11TECIND 11200 A 2 10 7
64549 11SCIPHY 11310 A 2 10 7
64549 11SCIEAE 11100 A 2 10 7
64549 11MATGEN 11235 A 2 10 7
64549 11ENGSTD 11130 A 2 10 7
64549 11TECHOS 26501 B 2 2 7
64549 11MUSDRS 63212 C 1 1 7
45461 11ECOECO 11110 A 2 13 7
45461 11ENGADV 11140 A 2 13 7
45461 11HISMOD 11270 A 2 13 7
45461 11HISLST 11220 A 2 13 7
45461 11MATMAT 11240 A 2 13 7
45461 11PRS1U 11350 A 1 13 7
45461 11SCIBIO 11030 A 2 13 7
Note for the first student, I have a count of Category A subject Units (11 in total) He is only doing Category A subjects. For the second student, he has 10 units of Category A subjects, he is doing 1 Category B subject worth 2 units and one category C subject worth 1 unit. the final student just has 13 Category A units.
Now what I would really like is something like this...!
StudentID Sum A Units Sum B Units Sum C Units Sum A Units + Sum B Units Count of Subjects
61687 11 0 0 11 7
64549 10 2 1 12 7
45461 13 0 0 13 7
So I would like some aggregated functions with a student grouped onto only 1 row and the sum of his different units as separate fields. I would also like a field which sums the Category A and B Units and also a field which gives a count of the total number of subjects they are doing. I could then use this data to set up some warning messages if a student is not doing the correct number of A or B Units etc
I have played around with common table expressions, subqueries etc but am not really sure what I am doing and am not sure which is the correct way about getting the data in the form I want.
Is anyone able to help?
SELECT
STUDENTID,
SUM(CASE BOARDCATEGORY WHEN 'A' THEN 1 ELSE 0 END) AS SUM_A_UNITS,
SUM(CASE BOARDCATEGORY WHEN 'B' THEN 1 ELSE 0 END) AS SUM_B_UNITS,
SUM(CASE BOARDCATEGORY WHEN 'C' THEN 1 ELSE 0 END) AS SUM_C_UNITS,
SUM(CASE BOARDCATEGORY WHEN 'A' THEN 1 WHEN 'B' THEN 1 ELSE 0 END) AS SUM_A_UNITS+SUM_B_UNITS,
COUNT(BOARDCODE) AS COUNT_OF_SUBJECTS
FROM (
SELECT StudentID
,AssessmentCode
,BoardCode
,BoardCategory
,BoardUnits
,sum(cast(boardunits as int)) over (partition by studentid,boardcategory) as UnitCount
,Count(boardcategory) over (partition by studentid) as SubjectCount
FROM uvNCStudentSubjectDetails
where fileyear = 2015
and filesemester = 1
and studentyearlevel = 11
and StudentIBFlag = 0
order by Studentnameinternal,BoardCategory
)
GROUP BY STUDENTID;
Wrapped your SQL statement in the solution, so that you can see what the solution does straight away.
Use SUM and CASE (i.e. SUM only when a condition is met).
I have 1 Virtual cube consists of 2 cubes.
Example of fact table of 1st cube.
id object_id time_id date_id state
1 10 2 1 0
2 11 5 1 0
3 10 7 1 1
4 10 3 1 0
5 11 4 1 0
6 11 7 1 1
7 10 8 1 0
8 11 5 1 0
9 10 7 1 1
10 10 9 1 2
Where State: 0 - Ok, 1 - Down, 2 - Unknown
For this cube I have one measure StateCount it should count States for each object_id.
Here for example we have such result:
for 10 : 3 times Ok , 2 times Down, 1 time Unknown
for 11 : 3 times Ok , 1 time Down
Second cube looks like this:
id object_id time_id date_id status
1 10 2 1 0
2 11 5 1 0
3 10 7 1 1
4 10 3 1 1
5 11 4 1 1
Where Status: 0 - out, 1 - in. I keep this in StatusDim.
In this table I keep records that should not be count. If object have status 1 that means that I have exclude it from count.
If we intersect these tables and use StateCount we will receive this result:
for 10 : 2 times Ok , 1 times Down, 1 time Unknown
for 11 : 2 times Ok , 1 time Down
As far as i know, i must use calculated member with IIF condition. Currently I'm trying something like this.
WITH MEMBER [Measures].[StateTimeCountDown] AS(
iif(
[StatusDimDown.DowntimeHierarchy].[DowntimeStatus].CurrentMember.MemberValue
<> "in"
, [Measures].[StateTimeCount]
, null )
)
The multidimensional way to do this would be to make attributes from your state and status columns (hopefully with user understandable members, i. e. using "Ok" and not "0"). Then, you can just use a normal count measure on the fact tables, and slice by these attributes. No need for complex calculation definitions.
I asked a question regarding joins yesterday. However although that answer my initial question, i'm having more problems.
I have a telephony table
ID | Date | Grade
1 07/19/2010 Grade 1
2 07/19/2010 Grade 1
3 07/20/2010 Grade 1
4 07/20/2010 Grade 2
5 07/21/2010 Grade 3
I also have a Grade table
ID | Name
1 Grade 1
2 Grade 2
3 Grade 3
4 Grade 4
5 Grade 5
6 Grade 6
7 Grade 7
8 Grade 8
9 Grade 9
10 Grade 10
11 Grade 11
12 Grade 12
I use the following query to get the COUNT of every grade in the telephony table, it works great.
SELECT grade.ID, Count(telephony.Grade) AS Total
FROM grade LEFT JOIN telephony ON grade.ID=telephony.Grade
GROUP BY grade.ID
ORDER BY 1;
This returns
ID | Total
1 3
2 1
3 1
4 0
5 0
6 0
7 0
8 0
9 0
10 0
11 0
12 0
However, what i'm trying to do is the following:
Group by date and only return results between two dates
SELECT telephony.Date, grade.ID, Count(telephony.Grade) AS Total
FROM grade LEFT JOIN telephony ON grade.ID=telephony.Grade
WHERE telephony.Date BETWEEN #07/19/2010# AND #07/23/2010#
GROUP BY telephony.Date, grade.ID
ORDER BY 1;
I'm getting the following
Date | ID | Total
07/19/2010 1 2
07/20/2010 1 1
07/20/2010 2 1
07/21/2010 3 1
It's not returning all the grades with 0 entries between the two dates, only the entries that exist for those dates. What i'm looking for is something like this:
Date | ID | Total
07/19/2010 1 2
07/19/2010 2 0
07/19/2010 3 0
07/19/2010 4 0
07/19/2010 5 0
07/19/2010 6 0
07/19/2010 7 0
07/19/2010 8 0
07/19/2010 9 0
07/19/2010 10 0
07/19/2010 11 0
07/19/2010 12 0
07/20/2010 1 1
07/20/2010 2 1
07/20/2010 3 0
07/20/2010 4 0
07/20/2010 5 0
07/20/2010 6 0
07/20/2010 7 0
07/20/2010 8 0
07/20/2010 9 0
07/20/2010 10 0
07/20/2010 11 0
07/20/2010 12 0
07/21/2010 1 2
07/21/2010 2 0
07/21/2010 3 1
07/21/2010 4 0
07/21/2010 5 0
07/21/2010 6 0
07/21/2010 7 0
07/21/2010 8 0
07/21/2010 9 0
07/21/2010 10 0
07/21/2010 11 0
07/21/2010 12 0
07/22/2010 1 2
07/22/2010 2 0
07/22/2010 3 0
07/22/2010 4 0
07/22/2010 5 0
07/22/2010 6 0
07/22/2010 7 0
07/22/2010 8 0
07/22/2010 9 0
07/22/2010 10 0
07/22/2010 11 0
07/22/2010 12 0
07/23/2010 1 2
07/23/2010 2 0
07/23/2010 3 0
07/23/2010 4 0
07/23/2010 5 0
07/23/2010 6 0
07/23/2010 7 0
07/23/2010 8 0
07/23/2010 9 0
07/23/2010 10 0
07/23/2010 11 0
07/23/2010 12 0
I hope someone can help. I'm using Microsoft Access 2003.
Cheers
Create a separate query on telephony which uses your BETWEEN #07/19/2010# AND #07/23/2010# constraint.
qryTelephonyDateRange:
SELECT *
FROM telephony
WHERE [Date] BETWEEN #07/19/2010# AND #07/23/2010#;
Then, in your original query, use:
LEFT JOIN qryTelephonyDateRange ON grade.ID=qryTelephonyDateRange.Grade
instead of
LEFT JOIN telephony ON grade.ID=telephony.Grade
You could use a subquery instead of a separate named query for qryTelephonyDateRange.
Note Date is a reserved word, so I bracketed the name to avoid ambiguity ... Access' database engine will understand it is supposed to be looking for a field named Date instead of the VBA Date() function. However, if it were my project, I would rename the field to avoid ambiguity ... name it something like tDate.
Update: You asked to see a subquery approach. Try this:
SELECT g.ID, t.[Date], Count(t.Grade) AS Total
FROM
grade AS g
LEFT JOIN (
SELECT Grade, [Date]
FROM telephony
WHERE [Date] BETWEEN #07/19/2010# AND #07/23/2010#
) AS t
ON g.ID=t.Grade
GROUP BY g.ID, t.[Date]
ORDER BY 1, 2;
Try this:
SELECT grade.ID, Count(telephony.Grade) AS Total
FROM grade LEFT JOIN telephony ON grade.ID=telephony.Grade
GROUP BY grade.ID
HAVING COUNT(telephony.Grade) > 0
ORDER BY grade.ID;
That's completely different.
You want a range of individual dates joined with your first table, and the between clause isn't going to do that for you.
I think you'll need a table with all the dates you want, say from 1/1/2010 to 12/31/2010, or whatever range you need to support. One column, 365 or however many rows with one date value each.
then join that table with the ones with the dates and grades, and limit by your date range,
then do the aggregation to count.
Take it one step at a time and it will be easier to figure out.
The way I got it to work was to:
Create a table named Dates with a single primary key date/time field named MyDate (I'm with HansUp on not using reserved words like "Date" for field names).
Fill the table with the date values I wanted (7/19/2010 to 7/23/2010, as in your example).
Write a query with the following SQL statement
SELECT x.MyDate AS [Date], x.ID, Count(t.ID) AS Total
FROM (SELECT Dates.MyDate, Grade.ID FROM Dates, Grade) AS x
LEFT JOIN Telephony AS t ON (x.MyDate = t.Date) AND (x.ID = t.Grade)
GROUP BY x.MyDate, x.ID;
That should get the results you asked for.
The subquery statement in the SQL creates a cross-join to get you every combination of date in the Dates table and grade in the Grade table.
(SELECT Dates.MyDate, Grade.ID FROM Dates, Grade) AS x
Once you have that, then it's just an outer join to the Telephony table to do the rest.