sql-order-by

In my PHP application, I have a mysql table of articles which has the following columns: article_id articletext category_id score Each article has a score which is calculated based on how popular it is, and belongs to a specific category (there are around 10 categories available) My question is: how can I perform a query that returns the highest scored articles while alternating them by categories so that if possible, no same-category articles are returned consecutively. For example if the highest scored article has score: 100 the returning set would be something like: article_id articletext

I want to lock one record in a table. The record is specified as "the next that has ID greater than..." CREATE TABLE test (id number); SELECT id FROM (SELECT id FROM test WHERE id > 10 ORDER BY id) WHERE ROWNUM = 1 FOR UPDATE; This seems intuitive and easy. But it is not. Any ideas? P.S. I do need the existing query to remain the same because it is a cursor and there are several places that use this cursor's %rowtype. I think you're going to need something like: SELECT id FROM test WHERE id = (SELECT MIN(id) FROM test WHERE id > 10) FOR UPDATE; 来源： https://stackoverflow.com/questions/3166615

I'm using Phonegap to do a dictionary app for iOS. When querying the database for an alphabetical list I use COLLATE NOCASE : ORDER BY term COLLATE NOCASE ASC This solved the problem that terms starting with a lower case letter where appended to the end (Picked it up from that question ). However non-standard characters as öäüéêè still get sorted in the end ~ here 2 examples: Expected: Öffnungszeiten Oberved: Zuzahlung Zuzahlung Öffnungszeiten (or) clé cliquer sur cliquer sur clé I looked around and found similar matters discussed here or here but it seems the general advice is to install some

Why I try to do an order by query, I always get an error telling me to check the syntax by the ORDER BY 'order' DESC.... Here's my query: SELECT * FROM posts ORDER BY order DESC; What am I doing wrong?? order is a reserved word in SQL; case does not matter. It must be quoted when used as an identifier . From the MySQL Reserved Words documentation: Certain words such as SELECT, DELETE, or BIGINT [or ORDER] are reserved and require special treatment for use as identifiers such as table and column names. Traditional MySQL quotes: SELECT * FROM posts ORDER BY `order` DESC; Proper (ANSI) SQL quotes

In our database, instead of making empty dates NULL , they are '0000-00-00' (I know, it sucks). How can I order these so that dates that are not '0000-00-00' are first and ordered ASC , and then the empty dates of '0000-00-00' come after? Thanks! ... ORDER BY CASE WHEN YourDateColumn = '0000-00-00' THEN 2 ELSE 1 END, YourDateColumn Try Below : SELECT * FROM your_table ORDER BY (date_column='0000-00-00'), date_column ASC OR select * from your_table order by if(date_column='0000-00-00',1,0),date_column; You can use a CASE WHEN http://dev.mysql.com/doc/refman/5.0/en/case-statement.html ... ORDER