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Re^2: Chronological Ordering of Nodes with the Same Timestamp

by kcott (Chancellor)
on Sep 14, 2017 at 07:09 UTC ( #1199376=note: print w/replies, xml ) Need Help??


in reply to Re: Chronological Ordering of Nodes with the Same Timestamp
in thread Chronological Ordering of Nodes with the Same Timestamp

G'day RonW,

I did consider a number of potential issues, including that one; however, they're all just guesswork on my part. The underlying problem is that #1199161 appeared after #1199162: my expectation was for the reverse order.

[It appears from ++jdporter's response, that the createtime was the same for both. I don't know how that specifically relates to timestamp.]

— Ken

Replies are listed 'Best First'.
Re^3: Chronological Ordering of Nodes with the Same Timestamp
by RonW (Vicar) on Sep 14, 2017 at 22:11 UTC

    I would presume createtime is the time stamp of the node's creation. Historically, files in Unix, and derived systems, had 3 time stamps: createtime, modtime and accesstime, referring to when a file was created, last modified and last accessed. Even when storing the nodes in a database, those names could be used as the corresponding field names. Also, it's quite possible for those fields to be auto-filled when a node record is created, updated or accessed.

    It may be that the database engine actually stores a higher resolution value, internally, than is made available to the program code using the database's API. Therefore, the ORDER_BY modifier to the SELECT operation may be using a higher resolution time stamp value.

    Also, it's possible that behavior similar to for (keys %hash) is occurring. If that is the case, then maybe changing:

    ORDER_BY('createtime')

    to:

    ORDER_BY('createtime', 'nodeid')

    would give the result you expected.

    (Assuming, of course, the database engine supports that.)

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