A very useful function in SQL is ‘datepart’ which can be used to retrieve a particular part (such as day, month etc) from a date/time field.
For example, let us say you need to retrieve the count of all records from a table by date.
Select datepart(day,timestamp),count(*) from my_Log with (nolock)
Where status = ‘ERROR’
Group by datepart(day,log_date)
In the above query:
My_log: Table name
Log_date: column that is of date/time type
Here is all the ‘datepart’ you can use: