Tagged Questions
6
votes
6answers
474 views
Find “n” consecutive free numbers from table
I have some table with numbers like this (status is either FREE or ASSIGNED)
id_set number status
-----------------------
1 000001 ASSIGNED
1 000002 FREE
1 000003 ...
4
votes
2answers
124 views
Select longest continuous sequence
I am trying to construct a query in PostgreSQL 9.0 that gets the longest sequence of continuous rows for a specifc field.
Consider the following table:
lap_id (Serial), lap_no (int), car_type ...
2
votes
1answer
75 views
sorting groups of related rows by average values while keeping the groups together
I'm using PostgreSQL 8.4, but would like a standard SQL solution if possible.
Consider the following table.
corrmodel=# SELECT * from data limit 1;
id | datasubgroup_id | datafile_id | ...
1
vote
1answer
137 views
Working of window functions and idea window size for window function
I am not able to understand the concept of window functions. How exactly they work and what are the pros and cons of such technique?
I have read that using limit and offset is slow but its still ...
0
votes
1answer
96 views
Select first row (grouping) + add aggregate function
First have a look at this question on StackOverflow.
I'm looking to accomplish the same task, except I also need to add an aggregate function (PostGIS's ST_Union) to my query.
How can I combine the ...
