Re: updating rows which have a common value forconsecutive dates

If you have the ability to use Window functions you can group (as necessary), order by last_update, and then use rank() to number each test run sequentially. Then you can limit the results to ( rank() <= 2 AND current_status = 'FAILED' ).

David J.

-----Original Message-----
From: pgsql-general-owner(at)postgresql(dot)org [mailto:pgsql-general-owner(at)postgresql(dot)org] On Behalf Of Lonni J Friedman
Sent: Wednesday, April 13, 2011 3:34 AM
To: pgsql-general
Subject: [GENERAL] updating rows which have a common value forconsecutive dates

Greetings,
I have a table full of automated test data, which continuously has new unique data inserted:

Column | Type |
Modifiers
----------------+-----------------------------+-------------------------
----------------+-----------------------------+-------------------------
----------------+-----------------------------+-----------
id | integer | not null default
nextval('dbltests_id_seq'::regclass)
testname | text | not null
last_update | timestamp without time zone | not null default now()
current_status | text | not null
os | text | not null
arch | text | not null
build_type | text | not null
branch | text | not null

The 'testname' column contains many different tests, and each unique 'testname' has numerous different associated os,arch,build_type & branch values. For example, testname='foo' will run on os='Linux',arch='i686',build_type='debug',branch='t38', and also on os='Windows7',arch='x86_64',build_type='release',branch='r40', etc, and there will be many other different testname's with similar permutations of the os,arch,build_type & branch columns. So for example, there will also be testname='bar' or testname='omega' or testname='sigma' for the other assorted os,arch,build_type & branch permutations.

The current_status column is either 'PASSED' or 'FAILED'.

What I'm struggling with is how to put together a SQL query which shows me all instances of a given testname permutation
(os,arch,build_type,branch) which has a current_status value of 'FAILED' for two or more most recent consecutive 'last_update' values.

Suggestions welcome.

thanks in advance!

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