Question

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SQL Query Group By Datetime problem?

I am working on an application with 2 steps.

• Scan logs and persist data from them in a database.
• Read data from database and visualize the data.

The first step is more or less finished. I try to explain the background and my reguirement with the second step.

Each row in the database consists of some info like logdate, logfilename, LogType, logMessage etc. So I want for example write SQL that summarize a given LogType per day.

This is the columns:

[LogDate] [datetime] NOT NULL,
[Computer] [varchar](50) NOT NULL,
[Type] [varchar](50) NOT NULL,
[FileName] [varchar](100) NOT NULL,
[LineNo] [int] NOT NULL,
[UserName] [varchar](50) NOT NULL,
[Message] [varchar](max) NOT NULL,

I imagine the output could be like this if I want to show all rows with Type=TDBError:

Date        Sum
2012-10-01  3
2012-10-02  12
2012-10-03  40
2012-10-05  24
2012-10-06  18

So at date 2012-10-01 there was 3 rows in DB where Type=TDBError. At date 2012-10-02 there was 12 etc.

How should I write the SQL for this ?

Answer 1

Assuming SQL Server 2008 or newer:

SELECT 
  [Date] = CONVERT(DATE, LogDate), 
  [Sum] = COUNT(*)
FROM dbo.Log_Table_Name
WHERE [Type] = 'DBError'
GROUP BY CONVERT(DATE, LogDate)
ORDER BY [Date];