SQL query generator

Write a SQL query from a plain-language question, for PostgreSQL, MySQL, SQLite, SQL Server or BigQuery. Give it the table layout (CREATE TABLE statements or a description of the columns) and the question; it returns the query, an explanation, the assumptions it had to make about your schema, and warnings such as a missing index or an ambiguous join. Read-only by default: it will not write DELETE or UPDATE unless the question asks for a change, and it says so when it does. Costs 10 credits per call with an API key or a signed-in session, drawn from the same monthly balance as REST calls (1 credit) and renders (25). Without either, a small free demo allowance per day. Also available on the MCP server as generate_sql.