Calculating difference of dates in Oracle

How to calculate difference between two dates in oracle, as subtraction of dates returns numeric value as difference. With some slight changes/enhancements we can track back the subtraction values to some readable date formats: Here are some examples, these can also be amended for user convenience: SQL> SELECT floor(((date1-date2)*24*60*60)/3600) 2 || ‘ HOURS ‘ || [...]

Find week start/end given week number

I have a table with some dated records. I wanted to do some weekly reports on this data. MySQL has a nifty function dubbed WEEK() which will return a week number. It allows you to break your data into week long intervals very easily. For example, the following query will tell me how many records [...]

How To Calculate the Number of Week Days Between two Dates

If the start date and end date are both week days, then the total number of week days in between is simply: (total difference in days) – (total difference in weeks) * 2 DateDiff(dd, @start, @end) – DateDiff(ww, @start, @end)*2 … since the DateDiff() function with weeks returns the number of week "boundaries" that are [...]