(DateDiff(dd, ISNULL(x.CDate, '1/1/1900'), y.DDate) > 5)
Understanding Line in SQL Statement
Page 1 of 13 Replies  921 Views  Last Post: 11 October 2012  07:57 AM
#1
Understanding Line in SQL Statement
Posted 11 October 2012  06:37 AM
I have recently started learning more and more about SQL, but this statement has me confused. If you could tell me what this means that would be great. Thanks!!
Replies To: Understanding Line in SQL Statement
#2
Re: Understanding Line in SQL Statement
Posted 11 October 2012  07:10 AM
Just break it down.
(DateDiff ' you want to read about datediff here.
(dd, ' from that link dd is day.. so are getting the number of days between two dates.
ISNULL(' you should read about isnull here.
x.CDate, ' some column name
'1/1/1900') ' if that column is null then use this date.
, y.DDate) ' find the number of days between x.CDate (or 01/01/1900 if x.Cdate is null) to y.Ddate
> 5)
' if that number of days between said dates is greater than five return true or else false.
(DateDiff ' you want to read about datediff here.
(dd, ' from that link dd is day.. so are getting the number of days between two dates.
ISNULL(' you should read about isnull here.
x.CDate, ' some column name
'1/1/1900') ' if that column is null then use this date.
, y.DDate) ' find the number of days between x.CDate (or 01/01/1900 if x.Cdate is null) to y.Ddate
> 5)
' if that number of days between said dates is greater than five return true or else false.
#3
Re: Understanding Line in SQL Statement
Posted 11 October 2012  07:44 AM
modi123_1, on 11 October 2012  07:10 AM, said:
Just break it down.
(DateDiff ' you want to read about datediff here.
(dd, ' from that link dd is day.. so are getting the number of days between two dates.
ISNULL(' you should read about isnull here.
x.CDate, ' some column name
'1/1/1900') ' if that column is null then use this date.
, y.DDate) ' find the number of days between x.CDate (or 01/01/1900 if x.Cdate is null) to y.Ddate
> 5)
' if that number of days between said dates is greater than five return true or else false.
(DateDiff ' you want to read about datediff here.
(dd, ' from that link dd is day.. so are getting the number of days between two dates.
ISNULL(' you should read about isnull here.
x.CDate, ' some column name
'1/1/1900') ' if that column is null then use this date.
, y.DDate) ' find the number of days between x.CDate (or 01/01/1900 if x.Cdate is null) to y.Ddate
> 5)
' if that number of days between said dates is greater than five return true or else false.
Thanks for your Reply. I am somewhat new to SQL so I was just making sure I was reading it correctly.
#4
Re: Understanding Line in SQL Statement
Posted 11 October 2012  07:57 AM
Hmmm.. well next time I'll have to make you tell me what you think it says first. Also I just noticed this is mysql not mssql... the function explanation is the same but you may get a bit more mileage out of hitting up the mysql search bar.
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