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# Count by Value in MS SQL 2000 Query

Posted on 2006-06-25
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I have a table with 4 columns : JobID, TechnicianID, Grade, Points
Each time a technician completes a job it will logged on to this table with proper grade (A,B,C,F) and numeric points.
I am trying to generate a report that sums the points and counts grade by technician.
So, the report will look like this:

TechID    TotalPoints    A count   B count    C count
123         900                5            2             7
234         850                4            1             6
....          ....                 .....................................

Is this possible with one query?

0
Question by:JOSHUABT
• 3
• 2

LVL 26

Expert Comment

ID: 16981220
You could do this:
SELECT TechnicianID, Grade, SUM(Points) AS 'Points'
FROM JobLog

But that would not show each grades on one row.
0

LVL 26

Expert Comment

ID: 16981268

SELECT TechnicianID, , SUM(Points) AS 'TotalPoints', COUNT(*)-COUNT(NULLIF(Grade, 'A')) AS 'A count', COUNT(*)-COUNT(NULLIF(Grade, 'B')) AS 'B count', COUNT(*)-COUNT(NULLIF(Grade, 'C')) AS 'C count'
FROM JobLog
GROUP BY TechnicianID
0

LVL 26

Assisted Solution

DireOrbAnt earned 200 total points
ID: 16981276
Sorry, double ,, here it is:
SELECT TechnicianID, SUM(Points) AS 'TotalPoints', COUNT(*)-COUNT(NULLIF(Grade, 'A')) AS 'A count', COUNT(*)-COUNT(NULLIF(Grade, 'B')) AS 'B count', COUNT(*)-COUNT(NULLIF(Grade, 'C')) AS 'C count'
FROM JobLog
GROUP BY TechnicianID
0

LVL 142

Accepted Solution

Guy Hengel [angelIII / a3] earned 300 total points
ID: 16981291
select techid, sum(points)
, sum(case when Grade='A' then 1 else 0 end) as A_Count
, sum(case when Grade='B' then 1 else 0 end) as B_Count
, sum(case when Grade='C' then 1 else 0 end) as C_Count
, sum(case when Grade='F' then 1 else 0 end) as F_Count
from yourtable
group by techid
0

LVL 5

Expert Comment

ID: 16981308
This looks like a "cross-tab" query... though of aggregates. SQL 2005 has some new support for cross-tab queries... but I haven't dug into it much at all (ie. if you're using SQL2005 look in books on line for cross tab).

Typically, where your number of columns are constrained (fixed in number) and reasonably small you can do the above with correlated sub-queries:

select
TechId,
sum(Points) as TotalPoints,
(select count(*)
and g2.Grade = 'A') as A_Count,
(select count(*)
and g2.Grade = 'B') as B_Count,
(select count(*)
and g2.Grade = 'C') as C_Count,
(select count(*)
and g2.Grade = 'F') as F_Count
group by TechId

Note... I followed your columns of A, B, C and F (no D or E).

With the above performance should be ok with an index by techid and grade... but the execution plan should be checked carefully.

Also... the above style can be somewhat fragile and a pain to maintain. Adding a new column means monkeying about with the SP. If the same sort of data is queried in several SP's then these will also need to be updated... and it may be easy to "miss" one.

(select count(*)

But... that may well involve a table scan... so caution is required.

Also... you could "push back" to the consumers of the query to do the "cross tabbing" themselves (this is relatively straight-forward to do in VB/C#/C++/etc). And many 3rd party reporting tools will do "cross tab" reports that will do this kind of thing for you (in Excel this sort of thing is called a pivot table).

Regards,

Rob
0

LVL 5

Expert Comment

ID: 16981311
Dang... I like DireOrbAnt and AngelIII solutions much better than mine :(

Must have sub-queries on the brain :)

Disregard!

Rob
0

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