In DataJoint for Python, what is the correct syntax of the ORDER BY argument used in the fetch
command?
The current documentation (as of 2018-08-17) only specifies the following syntax for DataJoint in MATLAB:
s = fetch(experiment.Session, '*', 'ORDER BY session_date DESC LIMIT 5')
In Python, the correct syntax for the ORDER BY argument is
table.fetch(order_by='attr')
If you need to sort by multiple attributes, provide them as a tuple:
table.fetch(order_by=('attr1', 'attr2'))
This will sort the fetched items in ascending order with respect to the specified attributes. To make it descending, add the word DESC
to the attributes.
table.fetch(order_by='attr DESC')
table.fetch(order_by=('attr1 DESC', 'attr2'))
You may optionally also use the word ASC
to make the ascending order implicit but omitting it has the same effect.