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The default is 6.īeyond the fractional seconds, the timestamp datatype is pretty much analogous to the date datatype. The optional fractional_seconds_precision is a number – from 0 to 9 – which tells Oracle how many digits you want to store your fractions of a second. Here’s how you specify a timestamp column: But just when you start thinking, “Big deal, DATE did that too,” it whips out it’s joker: it also records fractional seconds.Īdmittedly, not all processes are so time-critical that a millisecond here or there makes a difference, but since timestamp is no more cumbersome to use than date you might as well always use it. The timestamp datatype is made up of the century, year, month, day, hour, minute and second. It should it has everything date has and more. However, as part of Oracle 9i we were gifted the timestamp datatype, and, in truth, I’m surprised that it hasn’t totally supplanted the date datatype by now. Back when I started – a time when dinosaurs still roamed the plains and the earth was flat – the date datatype was all we had. I’ve been an Oracle developer for close to 20 years now (I’ll pause and give you a chance to say no way, you don’t look old enough!). Forget it all, because… The TIMESTAMP Datatype Got that? Great, now there’s one last thing I’d like you to do for me. A call to sysdate will always return the current date.Īnd that in essence is everything you need to know about the DATE datatype. There is one last thing I’d like to mention about the DATE datatype, and that is the sysdate function. Which might sound like a ridiculous thing for me to say, but if you think about it, trying to add two dates together is just as ridiculous. You also cannot slice them up and fry them in olive oil with chili and cumin. Let’s start by creating a table with a date column.
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Let me show you what I mean – and in the process we can chat about the to_date function. Oracle does not compel you to supply a time element each time you enter a date, but it’s probably worth bearing in mind that one is always recorded (the default time is midnight). It’s a seven byte store of century, year, month, day and hour, minute and second. Firstly, for example, it doesn’t really hold a date, instead it records a date time. Beneath the plainness of its name, it hides a little depth. The DATE DatatypeĭATE is the main – or rather, original – datatype used in Oracle for holding dates. In this article I’ll talk to you about dates, about time, and about how both are captured and calculated in an Oracle database. And though they might dress them in fancy clothing – varchar2, clob, float, integer – strings are really just strings, and numbers are really just numbers. Oracle for Absolute Beginners: Date, Timestamp and Interval - Simple TalkĪll databases stand on a tripod of datatypes: strings, numbers and dates.