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AdamWest
Constraint Violating Yak Guru
360 Posts |
 Posted - 2010-04-12 : 11:42:47
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| I have a table that is in chronological order. The row containsa timestamp field.How can I use SQL to determine the time difference (in seconds and parts ofseconds) between one record and the next |
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khtan
In (Som, Ni, Yak)
17689 Posts |
Posted - 2010-04-12 : 11:50:19
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what's the data type of the "timestamp field" ?also define what do you mean by "between one record and the next". ?Is the based on the primary key in ascending order ?
KH[spoiler]Time is always against us[/spoiler] |
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DBA in the making
Aged Yak Warrior
638 Posts |
Posted - 2010-04-12 : 11:55:06
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| HOLY HOW-TOs Batman. :)You could use a ROW_NUMBER() function to number each row. Then you could join that onto itself using the result of ROW_NUMBER() such that each record joins to the previous record. Then call datediff() to give you the value you need.Does the table have a primary key? What's its data type? Is the timestamp unique? Perhaps you could post a table def and some sample data.------------------------------------------------------------------------------------Any and all code contained within this post comes with a 100% money back guarantee. |
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AdamWest
Constraint Violating Yak Guru
360 Posts |
Posted - 2010-04-12 : 11:59:13
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| there is no keythe field is like this2010-04-12 10:07:01.523 |
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DBA in the making
Aged Yak Warrior
638 Posts |
Posted - 2010-04-12 : 12:05:48
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| Suppose you had 2 records with the exact same timestamp? How do you know what order they were entered in? Or doesn't it matter? It the timestamp field a datetime datatype?------------------------------------------------------------------------------------Any and all code contained within this post comes with a 100% money back guarantee. |
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determine the time diff