Tag: frame

Who logged to system from multiple countries in 2 hours?

Yesterday someone posted a set of queries for interviews, all centered on answering business-like questions from database.

Today this post is hidden behind some “subscribe to read more" thing, so I will not even link it, but one question there caught my eye.

Since I can't copy paste the text, I'll try to write what I remember:

Given table sessions, with columns: user_id, login_time, and country_id, list all cases where single account logged to the system from more than one country within 2 hour time frame.

The idea behind is that it would be a tool to find hacked account, based on idea that you generally can't change country within 2 hours. Which is somewhat true.

Solution in the blogpost suggested joining sessions table with itself, using some inequality condition. I think we can do better…

Continue reading Who logged to system from multiple countries in 2 hours?

Waiting for PostgreSQL 11 – Support all SQL:2011 options for window frame clauses.

On 7th of February 2018, Tom Lane committed patch:

Support all SQL:2011 options for window frame clauses.
 
 
This patch adds the ability to use "RANGE offset PRECEDING/FOLLOWING"
frame boundaries in window functions.  We'd punted on that back in the
original patch to add window functions, because it was not clear how to
do it in a reasonably data-type-extensible fashion.  That problem is
resolved here by adding the ability for btree operator classes to provide
an "in_range" support function that defines how to add or subtract the
RANGE offset value.  Factoring it this way also allows the operator class
to avoid overflow problems near the ends of the datatype's range, if it
wishes to expend effort on that.  (In the committed patch, the integer
opclasses handle that issue, but it did not seem worth the trouble to
avoid overflow failures for datetime types.)
 
The patch includes in_range support for the integer_ops opfamily
(int2/int4/int8) as well as the standard datetime types.  Support for
other numeric types has been requested, but that seems like suitable
material for a follow-on patch.
 
In addition, the patch adds GROUPS mode which counts the offset in
ORDER-BY peer groups rather than rows, and it adds the frame_exclusion
options specified by SQL:2011.  As far as I can see, we are now fully
up to spec on window framing options.
 
Existing behaviors remain unchanged, except that I changed the errcode
for a couple of existing error reports to meet the SQL spec's expectation
that negative "offset" values should be reported as SQLSTATE 22013.
 
Internally and in relevant parts of the documentation, we now consistently
use the terminology "offset PRECEDING/FOLLOWING" rather than "value
PRECEDING/FOLLOWING", since the term "value" is confusingly vague.
 
Oliver Ford, reviewed and whacked around some by me
 
Discussion: https://postgr.es/m/CAGMVOdu9sivPAxbNN0X+q19Sfv9edEPv=HibOJhB14TJv_RCQg@mail.gmail.com

Continue reading Waiting for PostgreSQL 11 – Support all SQL:2011 options for window frame clauses.

Waiting for 9.4 – Provide moving-aggregate support for a bunch of aggregates.

On 13th of April, Tom Lane committed patch:

Provide moving-aggregate support for a bunch of numerical aggregates.
 
First installment of the promised moving-aggregate support in built-in
aggregates: count(), sum(), avg(), stddev() and variance() for
assorted datatypes, though not for float4/float8.
 
In passing, remove a 2001-vintage kluge in interval_accum(): interval
array elements have been properly aligned since around 2003, but
nobody remembered to take out this workaround.  Also, fix a thinko
in the opr_sanity tests for moving-aggregate catalog entries.
 
David Rowley and Florian Pflug, reviewed by Dean Rasheed

On the same day he also committed:

Provide moving-aggregate support for boolean aggregates.
 
David Rowley and Florian Pflug, reviewed by Dean Rasheed

Continue reading Waiting for 9.4 – Provide moving-aggregate support for a bunch of aggregates.