gaps-and-islands

Purpose & What I've Got So Far I am attempting to create a view which checks for missing labor transactions. The view will be fed to a Crystal report. In this case, the view should take all dates between sysdate+30 and sysdate -30, and then should left outer join all labor records by active employees for each of those dates. It then gives a count of the number of labor transactions for each employee for each date. This gets passed to the Crystal Report, which will filter based on a specific date range (within the +/- 30 range by the view). From there, the count of all days will summed up per

I have mysql table called user(id, name, join_on) join on is a date field what I want is to show in each day how many uses has been created I can use group by but it will only give me the dates when users get added like if date 4/12/10 5 users added 4/13/10 2 users added 4/15/10 7 users added here date 4/14/10 is missing and I want listing of all dates in one month. I have one solution for it by creating another table only for adding date and that table will left join my users table on join_on and will give total result but I don't want to do that as for creating that I need to create and add

For this Table: +----+--------+-------+ | ID | Status | Value | +----+--------+-------+ | 1 | 1 | 4 | | 2 | 1 | 7 | | 3 | 1 | 9 | | 4 | 2 | 1 | | 5 | 2 | 7 | | 6 | 1 | 8 | | 7 | 1 | 9 | | 8 | 2 | 1 | | 9 | 0 | 4 | | 10 | 0 | 3 | | 11 | 0 | 8 | | 12 | 1 | 9 | | 13 | 3 | 1 | +----+--------+-------+ I need to sum sequential groups with the same Status to produce this result. +--------+------------+ | Status | Sum(Value) | +--------+------------+ | 1 | 20 | | 2 | 8 | | 1 | 17 | | 2 | 1 | | 0 | 15 | | 1 | 9 | | 3 | 1 | +--------+------------+ How can I do that in SQL Server? NB: The values in the

I have a table: create table table1 (event_id integer, event_time timestamp without time zone); insert into table1 (event_id, event_time) values (1, '2011-01-01 00:00:00'), (2, '2011-01-01 00:00:15'), (3, '2011-01-01 00:00:29'), (4, '2011-01-01 00:00:58'), (5, '2011-01-02 06:03:00'), (6, '2011-01-02 06:03:09'), (7, '2011-01-05 11:01:31'), (8, '2011-01-05 11:02:15'), (9, '2011-01-06 09:34:19'), (10, '2011-01-06 09:34:41'), (11, '2011-01-06 09:35:06'); I would like to construct a statement that given an event could return the length of the 'run' of events starting with that event. A run is

(PostgreSQL 8.4) Continuing with my previous example , I wish to further my understanding of gaps-and-islands processing with Window-functions. Consider the following table and data: CREATE TABLE T1 ( id SERIAL PRIMARY KEY, val INT, -- some device status INT -- 0=OFF, 1=ON ); INSERT INTO T1 (val, status) VALUES (10, 0); INSERT INTO T1 (val, status) VALUES (11, 0); INSERT INTO T1 (val, status) VALUES (11, 1); INSERT INTO T1 (val, status) VALUES (10, 1); INSERT INTO T1 (val, status) VALUES (11, 0); INSERT INTO T1 (val, status) VALUES (10, 0); As previously explained, the devices turn ON and OFF

I have the following table. DATE | AMT 10/10 | 300 12/10 | 300 01/11 | 200 03/11 | 100 How do I get the monthly total? A result like - DATE | TOT 1010 | 300 1110 | 300 1210 | 600 0111 | 800 0211 | 800 0311 | 900 A sql statement like SELECT SUM(AMT) FROM TABLE1 WHERE DATE BETWEEN '1010' AND '0111' would result in the 800 for 0111 but... NOTE There is not a date restriction. which is my dilemma. How do I populate this column without doing a loop for all dates and have the missing months displayed as well? To cater for missing months, create a template table to join against. Think of it as