SQL Query Generator - From a Question to a Query

Ask in plain words, paste your table layout, pick the database, and get a readable query with an explanation, the assumptions it made about your schema, and warnings about performance and NULL traps. Read-only unless you ask for a change.

Getting a Query You Can Trust

The quality of a generated query depends almost entirely on what it knows about your tables. Paste the CREATE TABLE statements, or at least the table names with their columns and which column links to which, and the assumptions list shrinks to nothing. Leave the schema out and the tool still answers, but every guessed name is listed so you can check it before running anything. Dialect matters more than people expect: date arithmetic, string functions, LIMIT versus TOP, quoting of identifiers and boolean handling all differ, and a query written for PostgreSQL fails on SQL Server in the first line.

The warnings are the part worth reading twice. NOT IN with a subquery that can return NULL matches nothing; a filter on a function of a column defeats the index; a join on a non-unique column doubles the rows before the SUM. The generator never writes INSERT, UPDATE, DELETE or DDL unless the question asks for a change, and marks the query when it does. The same generator is available to scripts and AI agents through the ToolForte REST API and MCP server as generate_sql.

How the SQL Query Generator Works

  1. 01Write the question the query should answer, as you would ask a colleague.
  2. 02Pick the database: PostgreSQL, MySQL, SQLite, SQL Server or BigQuery. Date arithmetic, string functions, limits and quoting differ between them.
  3. 03Paste the table layout: CREATE TABLE statements or table names with their columns and how they link. The fewer assumptions the tool has to make, the better the query.
  4. 04Read the assumptions and warnings, then run the query on a copy or inside a transaction.

Getting a Query You Can Trust

The quality of a generated query depends on what it knows about your tables. With the schema, the assumptions list shrinks to nothing; without it, every guessed name is listed so you can check before running anything. Dialect matters more than people expect: a query written for PostgreSQL fails on SQL Server in the first line. The warnings are worth reading twice: NOT IN with a subquery that can return NULL matches nothing, a function on an indexed column defeats the index, a join on a non-unique column doubles the rows before the SUM. The generator never writes INSERT, UPDATE, DELETE or DDL unless the question asks for a change, and marks the query when it does.

When to Use This Tool

When you can describe the report but not the joins. When you switch databases and the syntax you know does not carry over. When you want a starting point for a complex query and would rather review than write from scratch. When you want the query explained back to you to check that it matches the question.

Frequently Asked Questions

Will it change my data?→
Not unless you ask it to. It writes read-only queries by default and marks a query that modifies data so you run it inside a transaction on a copy first.
Is my schema stored?→
The question and schema are sent to ToolForte for the generation and are not kept afterwards. The same generator is available through the ToolForte REST API and MCP server as generate_sql.
Which dialects are supported?→
PostgreSQL, MySQL and MariaDB, SQLite, SQL Server (T-SQL) and BigQuery.

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