sql-order-by

I am trying to sort an SQLAlchemy ORM object by a field, but with a specific order of the values (which is neither ascending or descending). If I was doing this query on MySQL, it would look like; SELECT letter FROM alphabet_table WHERE letter in ('g','a','c','k') ORDER BY FIELDS( letter, 'g','a','c','k'); for the output: letter ------ g a c k For SQLAlchemy, I've been trying things along the lines of: session.query(AlphabetTable).filter(AlphabetTable.letter.in_(('g','a','c','k'))).order_by(AlphabetTable.letter.in_(('g','a','c','k'))) Which doesn't work... any ideas? It's a small one-time

I would like to know if this is possible using a mysql query: I have a table called updates. In the updates table I have 2 columns, id and timestamp . I have 5 rows each with the same id but with different date timestamps. An example of this timestamp would be the value: 2012-08-04 23:14:09 . I would like to select only the most recent timestamp value out of the 5 results. This could also be explained by saying that I would like to select the value that is closest to the current date and time. How could I do this? Vitor M SELECT id, timestamp FROM updates ORDER BY timestamp DESC LIMIT 1 have

I have a small query, and a union to put another small query next to it. However, the union has a syntax error in it. Select <column1> ,<column2> From <Table1> <Some joins in there> Where <conditions> group by <column2> order by <column2> union select <column2> ,<column3> ,<column4> From <Table2> <Some more joins here> Where <conditions> group by <column2> order by <column2> This is the Error I receive ERROR: Syntax error at or near 'union' I see what was wrong. You have to place the order by at the end of the query, and only at the end. It gave me an error because it thought the query had

With a query like this (simplified for clarity): SELECT 'East' AS name, * FROM events WHERE event_timestamp BETWEEN '2015-06-14 06:15:00' AND '2015-06-21 06:15:00' UNION SELECT 'West' AS name, * FROM events WHERE event_timestamp BETWEEN '2015-06-14 06:15:00' AND '2015-06-21 06:15:00' UNION SELECT 'Both' AS name, * FROM events WHERE event_timestamp BETWEEN '2015-06-14 06:15:00' AND '2015-06-21 06:15:00' I want to customise the order of the resulting rows. Something like: ORDER BY name='East', name='West', name='Both' Or ORDER BY CASE WHEN name='East' THEN 1 WHEN name='West' THEN 2 WHEN name=

I have the following model (greatly simplified for the purposes of this question): class Product(models.Model): price = models.DecimalField(max_digits=8, decimal_places=2) sale_price = models.DecimalField(max_digits=10, blank=True, null=True, decimal_places=2) For the majority of products, price will be filled but sale_price will not be. So, I can order products by price like so: Product.objects.order_by('price') Product.objects.order_by('-price') However, some products will have a sale_price, and I can't find a way to order these neatly so that the sale price interleaves with the normal price