datediff

can someone explain to me this line of code:
datediff(now(),post_date) = 0
karinos57Asked:
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tim_csCommented:
Where are you trying to run this?  The following would be checking to see if the dates match each other.  What you posted wouldn't run in SQL unless you've created some custom functions.

datediff(d,getdate(),post_date) = 0
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Lee SavidgeCommented:
Is this mySQL code?

If so, datediff subtracts one date from another so this is checking to see if the result is 0 days as I suspect this is part of an if statement or a select where clause.
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JestersGrindCommented:
You have posted this in the SQL Server areas, but it actually looks like Access.  Now() is an Access function.  It also looks like you are missing an argument.  The syntax should be DATEDIFF(interval, date1, date2) where interval is the unit of time(days, hours, seconds, milliseconds, etc) and date1 is the start date and date2 is the end date.  The function returns the number of time units between the two dates.  The code you posted, if rewritten correctly, is looking for a value in post_date that is exactly the same as the current date time.

Greg

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karinos57Author Commented:
yeah, this is mysql code. thx
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Lee SavidgeCommented:
If the code is part of a where clause, then it will return all records that are zero days apart. DateDiff in mySQL will take 2 parameters. It will subtract, in your case, now() which is the time and date as it is now, from the post_date which is a field in the table and if the result is zero it will return the record.

See here: http://dev.mysql.com/doc/refman/5.1/en/date-and-time-functions.html#function_datediff

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karinos57Author Commented:
tx
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