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Extend the explanation a bit.

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jbranchaud
2015-03-20 15:19:30 -05:00
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postgres/timestamp-functions.md
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@@ -24,5 +24,14 @@ where it appears in a given statement.
Try running something like this to see:
```postgresql
select clock_timestamp(), clock_timestamp(), clock_timestamp(), clock_timestamp();
> select clock_timestamp(), clock_timestamp(), clock_timestamp(), clock_timestamp();
clock_timestamp | clock_timestamp | clock_timestamp | clock_timestamp
-------------------------------+-------------------------------+-------------------------------+------------------------------
2015-03-20 14:58:49.832592-05 | 2015-03-20 14:58:49.832592-05 | 2015-03-20 14:58:49.832593-05 | 2015-03-20 14:58:49.832593-05
```
You'll notice that we see a change in the clock time at the microsecond
level mid-way through the statement.
sources: [postgres docs](http://www.postgresql.org/docs/9.1/static/functions-datetime.html) and
[Jack C.](http://hashrocket.com/team/jack-christensen)