Sort by a column in a union query in SqlAlchemy SQLite

Question

As explained in this question, you can use string literals to do order by in unions.

For example, this works with Oracle:

query         


        

Answer 1

The queries that are part of a union query must not be sorted.

To be able to use limits inside a compound query, you must wrap the individual queries inside a separate subquery:

SELECT * FROM (SELECT ... LIMIT ...)
UNION ALL
SELECT * FROM (SELECT ... LIMIT ...)

q1 = select(...).limit(...).subquery()
q2 = select(...).limit(...).subquery()
query = q1.union_all(q2)...