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Displaying posts with tag: microsecond (reset)

Datetime & Timestamp manipulation / migration explained
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Are you doing some datetime manipulation or maybe you are migrating from some database technology to MySQL or possibly using milliseconds?
Here is an example on how to go about it:

Say you have the following date: MAR 16 2008 09:12:51:893AM
SELECT DATE_FORMAT(STR_TO_DATE('MAR 16 2008 09:12:51:893AM','%M %d %Y %h:%i:%s:%f%p'),'%Y%m%d%k%i%s.%f'); --> 2008031691251.893000

What if its PM rather than AM
SELECT DATE_FORMAT(STR_TO_DATE('MAR 16 2008 09:12:51:893PM','%M %d %Y %h:%i:%s:%f%p'),'%Y%m%d%k%i%s.%f'); --> 20080316211251.893000

Ok so this is …






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Once upon a timestamp(milliseconds)….
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Once upon a time`stamp`, in a `data`base far far away, someone filed a bug named: `Microseconds precision is not retained by TIME, DATETIME, and TIMESTAMP field types.` – Bug Number 8523. This was the beginning of 2005, yet now that we are approaching the end of 2009, after 4.5 years, many (including myself) are still asking for this.

In fairness sake, MySQL have indeed supplied a way to retain milli and micro seconds in a decimal field `DECIMAL(17,3)`, and it is also queryable as if it were a timestamp BUT why isn’t it possible to store in a `DATETIME` or `TIMESTAMP` field? Why can’t we run a ’select now()’ or ’select curtime()’ …

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Q&A on MySQL 5.1
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Listening to Sheeri's presentation on MySQL 5.1, I saw that there are a few questions left unanswered. I am listing here some of the questions that I found interesting, plus a few from an early webinar on the same topic.

Q: does Partitioning physically split data?
A: No. Some engines (MyISAM, Archive) do a physical split, but this is not necessary, as you see if you apply partitioning to a InnoDB table. Partitioning is a logical split of data, for easy retrieval. It is completely transparent to the user. …

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