How to get count and percentage using SQL Query?

Question

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Given below is the database table(TableA).

HTML

SlNo  TeamName  WorkInfo SubmitDate
----  -------   -------  ---------
 1     Team1        0      10/10/2014
 2     Team1        0      10/10/2014
 3     Team1        1      11/10/2014
 4     Team2        1      12/15/2014
 5     Team2        1      10/10/2014
 6     Team3        0      10/10/2014
 7     Team3        1      10/10/2014

I have two text boxes for selecting start and end date. I want to display details in between that dates.
Given below code is used to find the date difference between start date and end date and displayed on another text box named as "`txtTotalDays`".

Code:

C#

DateTime d1 = txtStartDate.Text != string.Empty ? Convert.ToDateTime(txtStartDate.Text) : DateTime.MinValue;
DateTime d2 = txtEndDate.Text != string.Empty ? 
Convert.ToDateTime(txtEndDate.Text) : DateTime.MinValue; 
TimeSpan tspan = d2 - d1;
txtTotalDays.Text = tspan.TotalDays.ToString()

Given below query is giving the details and count based on the start date and end date.

SQL Query

SQL

SELECT TeamName,Count(DISTINCT CASE WHEN WorkInfo = 1 THEN SlNo end) AS Count1 , Count(DISTINCT CASE WHEN WorkInfo = 0 THEN SlNo end) AS Count0 FROM tableA
WHERE (SubmitDate BETWEEN @start AND @end) GROUP BY TeamName

The above query shows the out put like given below:

HTML

TeamName   Count1   Count0
--------   -----    ------
 Team1        1        2
 Team2        2        0
 Team3        1        1

I want to display the percentage based on the `count and date difference` . Help me to modify the above solution. `The expecting output sample is given below:`

I selected start date and end date. I got the date difference (txtTotalDays.Text) as 10. Based on that date selection I want get values like given below.

HTML

TeamName   Count1   Count0  Percentage1  Percentage0
--------   -----    ------  -----------  -----------
Team1        1        2        10%           20%
Team2        2        0        20%            0%
Team3        1        1        10%           10%

Help me to find a proper solution. Thank You.

Posted 5-Jan-15 18:26pm

Member 11042100

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2 solutions

Solution 1

Modify the query with below.

SQL

select t.TeamName,t.Count1,t.Count0,(t.Count1/(daysDifference * 100) as Percentage1,
(t.Count0/(daysDifference * 100) as Percentage0 from 
(SELECT TeamName,Count(DISTINCT CASE WHEN WorkInfo = 1 THEN SlNo end) AS Count1 , Count(DISTINCT CASE WHEN WorkInfo = 0 THEN SlNo end) AS Count0 FROM tableA
WHERE (SubmitDate BETWEEN @start AND @end) GROUP BY TeamName) as t

where daysDifference is your c# variable.

Posted 5-Jan-15 19:23pm

Praveen Kumar Upadhyay

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Member 11042100 · Accepted Answer · 2015-01-05T19:41:00

Solution 2

SQL

SELECT 
  TeamName,
  Count(DISTINCT CASE WHEN WorkInfo = 1 THEN SlNo end) AS Count1, 
  Count(DISTINCT CASE WHEN WorkInfo = 0 THEN SlNo end) AS Count0,
  Count(DISTINCT CASE WHEN WorkInfo = 1 THEN SlNo end) * 100.0 / (DATEDIFF(Day, @start, @end) + 1) AS Percentage1,
  Count(DISTINCT CASE WHEN WorkInfo = 0 THEN SlNo end) * 100.0 / (DATEDIFF(Day, @start, @end) + 1) AS Percentage0
FROM 
  tableA 
WHERE 
  (SubmitDate BETWEEN @start AND @end) 
GROUP BY 
  TeamName

Posted 5-Jan-15 19:41pm

Member 11042100

Comments

Praveen Kumar Upadhyay 6-Jan-15 5:25am

My solutions has optimized query. In your query
DISTINCT CASE WHEN WorkInfo = 1 THEN SlNo end
and
DISTINCT CASE WHEN WorkInfo = 0 THEN SlNo end
will exeucte two times. If your table size is huge then finding DISTINCT result multiple time will slow down your query and performance also.