Problem:* I\'m trying to calculate the number of consecutive absence each student have for a particular class. However, the count need to be restarted if that student did attend class for one day.
I have limited experience with joins, and this puzzle has me stumped. Here are the relevant tables from my mysql database:
I\'m trying to speed up this query: SELECT order.id FROM ( 开发者_Go百科SELECT o.id FROM `order` as `o`
I have got two entities (example reduced as much as possible; each entity has got an id field): @Entity
I have two tables: mysql> desc myps3t_gameusertrophyinfo; +-----------+--------------+------+-----+---------+----------------+
For the last two days, I have been asking questions on rank queries in Mysql. So far, I have working queries for
I\'ve seen people hypothetically say t开发者_Go百科hat there are cases when a subquery can be more efficient than a join but I have never actually seen a good example of this?
I have a lot of tables that look like this: (id, user_id, object_id). I am often interested in the question \"how many users have one object? how many have two? etc.\" and would like to see the distri
I have table with 3 columns: id (of person), city (which person visited) and date (of his visit). I need to select all people (their ids) which were in city Los Angeles between specific date, who also
SELECT f.nummer AS factuur_id, f.mvoor AS factuur, f.faktuurnr AS factuur_nr, f.topdatum AS factuur_datum,
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