gaps-and-islands

Following-up on my question here . Say I have a table in an Oracle database like the one below (table_1) which tracks service involvement for a particular individual: name day srvc_ inv bill 1 1 bill 2 1 bill 3 0 bill 4 0 bill 5 1 bill 6 0 susy 1 1 susy 2 0 susy 3 1 susy 4 0 susy 5 1 My goal is to get a summary table which lists, for all unique individuals, whether there was service involvement and the number of distinct service episodes (in this case 2 for bill and 3 for susy), where a distinct service episode is identified by a break in activity over days. To get any service involvement, I

DATA given: inventory_num_id inventory_group_id num code 9681066 100003894 211 E 9679839 100003894 212 E 9687165 100003894 213 E 9680883 100003894 214 I 9710863 100003894 515 E 9681246 100003894 516 E 9682695 100003894 517 E 9681239 100003894 518 E 9685409 100003894 519 E 9679843 100003894 520 C 9679844 100003894 521 C 9714882 100003894 522 E 9679845 100003894 523 I 9681211 100003894 524 E 9681216 100003894 525 E 9682696 100003894 526 E 9681227 100003894 527 E Result examples should be like: inventory_group_id code start end ------------------ ---- ----- ---- 100003894 E 211 213 100003894 I

I have table with rows: clientid, startdate and enddate. Date cant overlap for same clientid. I would like to merge rows for every client if date connects. table looks like this: clientid startdate enddate 1 10.10.2017 12.10.2017 1 12.10.2017 13.10.2017 1 13.10.2017 17.10.2017 1 10.11.2017 17.11.2017 1 17.11.2017 23.11.2017 1 12.12.2017 14.12.2017 2 10.11.2017 15.11.2017 2 01.12.2017 02.12.2017 2 02.12.2017 05.12.2017 Final table should looks like this: clientid startdate enddate 1 10.10.2017 17.10.2017 1 10.11.2017 23.11.2017 1 12.12.2017 14.12.2017 2 10.11.2017 15.11.2017 2 01.12.2017 05.12

Backstory: I have a database that has data points of drivers in trucks which also contain the. While in a truck, the driver can have a 'driverstatus'. What I'd like to do is group these statuses by driver, truck. As of now, I've tried using LAG/LEAD to help. The reason for this is so I can tell when a driverstatus change occurs, and then I can mark that row as having the last datetime of that status. That in itself is insufficient, because I need to group the statuses by their status and date. For this, I've got something such as DENSE_RANK, but I can't manage to get that right concerning the

I would like to make Postgres choose the first next available id so that no error occurs in the following case: CREATE TABLE test( id serial PRIMARY KEY, name varchar ); Then: INSERT INTO test VALUES (2,'dd'); INSERT INTO test (name) VALUES ('aa'); INSERT INTO test (name) VALUES ('bb'); This will give a constraint error since id is primary. How can I tell Postgres to insert the record with the next free id? Erwin Brandstetter Generally it's best to never overrule the default in a serial column. If you sometimes need to provide id values manually, replace the standard DEFAULT clause nextval(

If I have a table like this Number Status ------ ------ 1 A 2 A 3 A 4 U 5 U 6 A 7 U 8 U 9 A 10 A What query can I use to group the range into ranges where Status = A? Range Count Status ----- ----- ------ 1-3 3 A 6-6 1 A 9-10 2 A My query is select min(number) || '--' || max(number), count(*), Status from table where Status = 'A' group by Status Range Count Status ----- ----- ------ 1-10 6 A This is a nice way, fancy name " Tabibitosan method " given by Aketi Jyuuzou. SQL> WITH data AS 2 (SELECT num - DENSE_RANK() OVER(PARTITION BY status ORDER BY num) grp, 3 status, 4 num 5 FROM t 6 ) 7