0
votes
1answer
33 views

Sorting by a field in child table

There are two tables: contract (with primary key contractid) and contractupdate (with field contractid referring to a contract). contractupdate also has DATE field startdate and TINYINT field day. I ...
2
votes
2answers
2k views

MySQL not using indexes when joining against another table

I have two tables, the first table contains all articles / blog posts within a CMS. Some of these articles may also appear in a magazine, in which case they have a foreign key relationship with ...
0
votes
1answer
506 views

How can I join two tables while filtering the results with a“ WHERE IN” clause? [closed]

What I am trying to do is set up a selection filter for a cascading list on my site. When I say selection filter, I mean I am trying to limit, and sort the results based on what the user selects. I ...
3
votes
1answer
632 views

How to order query results by tag weight in IN('tag1', 'tag2', 'tag3')

Consider a simple query as SELECT * FROM posts JOIN tags USING(post_id) JOIN tag_map USING(tag_id) WHERE tags.tag IN('tag1', 'tag2', 'tag3') tag_map is a many-to-many relationship between tables ...