Question

I have table tblEvents with columns dEvent_Date, dEvent_Time, tEvent_Emp_Code_num

I must group all dates and get all minimum time from each of them.

For example I wrote below query, but its nothing printed.

SELECT dEvent_Date, MIN(dEvent_Time) as minTime 
FROM tblEvents 
WHERE
     tEvent_Emp_Code_num = 26 AND dEvent_Date = 11/18/2010 
GROUP BY dEvent_Date

After that I tested below query, it works, but it prints all days, I need only specified date’s data.

SELECT dEvent_Date, MIN(dEvent_Time) as minTime 
FROM tblEvents 
WHERE tEvent_Emp_Code_num = 26 GROUP BY dEvent_Date

Can you help me?

Answer 1

i had same problem and i have used cast function in mysql where my query look like

CREATE VIEW v_a AS SELECT
  tblEvents .*,
  EXTRACT(YEAR FROM dEvent_Date) AS 'year',
  EXTRACT(MONTH FROM dEvent_Date) AS 'month',
  DAYOFMONTH(dEvent_Date) AS 'day'
FROM tblEvents WHERE tEvent_Emp_Code_num = 26;
SELECT
  v.year,
  v.month,
  v.day,
  count(v.id)
FROM v_a AS v
GROUP BY v.year,v.month,v.day

for SQL SErver you may use CONVERT Function

SELECT CONVERT(VARCHAR(8), GETDATE(), 4) AS [DD.MM.YY]

or cast function

SELECT CAST(YEAR(GETDATE()) AS VARCHAR(4)) 

perhaps following post is more useful

Get Date Only Function