I created this index on a large orders table: CREATE INDEX idx_orders_customer_date ON orders (customer_id, ordered_at); Queries by customer are fast. A report that filters only…
I have a script that loads data every few minutes and a second one that updates a status table. When they overlap, one of them fails with sqlite3.OperationalError: database is…
I rank students by score with a window function and the numbers skip: 1, 2, 2, 4. I expected 1, 2, 2, 3. SELECT name, score, RANK() OVER (ORDER BY score DESC) AS position FROM…