SQLMind

Generate a PostgreSQL query for this request: count newly registered users in each city over the past 30 days and sort by user count descending. The users table has id, city, and created_at columns.

A runnable PostgreSQL query with correct grouping, time filtering, and sorting logic.

Convert this MySQL query to BigQuery syntax and explain any function differences: SELECT DATE_FORMAT(created_at, '%Y-%m') AS month, COUNT(*) FROM orders GROUP BY month;

An equivalent BigQuery query plus a brief note on syntax differences such as date formatting functions.

Check whether this SQL has syntax or column reference issues, and explain how to fix it using the database schema: SELECT customer_name, SUM(amount) FROM payments WHERE payment_date >= '2024-01-01' GROUP BY customer_id;

Identification of grouping or column reference issues, along with a corrected SQL query based on the schema.