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sql-query-generator

A SQL query generator turns a table schema and a few clicks into ready-to-run SQL — SELECT with filters, INSERT with values, UPDATE with WHERE, DELETE, JOIN. Useful when the syntax is fuzzy (which dialect quotes identifiers with double-quotes vs backticks?), when the table has many columns and you don't want to type them all, or when you need a quick boilerplate for a stored procedure. The ZTools SQL Query Generator builds queries for MySQL, PostgreSQL, SQLite, MSSQL, and Oracle — handling per-dialect quoting, parameter placeholders, and common gotchas like LIMIT vs TOP.

Use cases​

Quickly draft INSERT for a wide table​

Forty columns; typing INSERT INTO ... by hand is error-prone. Paste schema, get template, fill values.

Switch dialects without learning quirks​

Code worked on PostgreSQL; need to port to MSSQL. Generator emits TOP N instead of LIMIT N and uses brackets for identifiers.

Boilerplate for prepared statements​

Generates parameterised queries with the right placeholder syntax: ? for MySQL, $1 for PostgreSQL, @p0 for MSSQL.

Teaching SQL​

Show a student the same query in five dialects side-by-side — concrete way to teach portability lessons.

How it works​

  1. Define table schema — Enter table name + columns (name, type, nullable, default). Or paste an existing CREATE TABLE statement and let the tool parse it.
  2. Pick query type — SELECT, INSERT, UPDATE, DELETE, UPSERT (per dialect: ON DUPLICATE KEY for MySQL, ON CONFLICT for Postgres).
  3. Configure — For SELECT: pick columns, WHERE filters, ORDER BY, LIMIT. For INSERT: column list, parameter style. For UPDATE: SET clauses + WHERE.
  4. Pick dialect — MySQL / PostgreSQL / SQLite / MSSQL / Oracle. Output adjusts: identifier quoting, LIMIT/TOP/FETCH, parameter placeholders.

Examples​

Input: SELECT all from users WHERE age > 18, ORDER BY name, LIMIT 10 (MySQL)

Output: SELECT * FROM users WHERE age > 18 ORDER BY name LIMIT 10;

Input: Same query (MSSQL)

Output: SELECT TOP 10 * FROM [users] WHERE [age] > 18 ORDER BY [name];

Input: INSERT for users(name, email) with placeholders (Postgres)

Output: INSERT INTO "users" ("name", "email") VALUES ($1, $2);

Input: UPSERT (Postgres ON CONFLICT)

Output: INSERT INTO "users" ("id","name") VALUES ($1,$2) ON CONFLICT ("id") DO UPDATE SET "name" = EXCLUDED."name";

Frequently asked questions​

Does it execute the query?

No — generator only. To run, paste into your database client (DBeaver, psql, MySQL Workbench).

Why are identifiers quoted?

Quoting protects against reserved-word collisions (order, user) and case-sensitivity quirks. Quoted identifiers are slightly verbose but always safe.

Does it handle JOINs?

Yes — multi-table SELECT with INNER / LEFT / RIGHT / FULL OUTER JOIN. Generator asks for the join condition and column selection per side.

Privacy?

All generation in the browser. Schemas / values never uploaded.

Does it warn about SQL injection risk?

When you paste literal values, output uses string concatenation (vulnerable). Toggle "parameterise" to use placeholders — the safe default for app code.

Can it generate stored procedures?

Basic CREATE PROCEDURE templates per dialect. Complex procedural logic (cursors, control flow) is dialect-specific and out of scope.

Tips​

  • Always parameterise — generator-output queries with literal values are an injection footgun. Use placeholders in production code.
  • When porting code across dialects, regenerate rather than hand-edit. Misses on identifier quoting / LIMIT syntax cause runtime errors.
  • For UPSERT, pick the right dialect-specific form — MySQL's ON DUPLICATE KEY differs subtly from Postgres ON CONFLICT.
  • Schema-paste mode is the fastest start — no manual column entry.

Try it now​

The full sql-query-generator runs in your browser at https://ztools.zaions.com/sql-query-generator — no signup, no upload, no data leaves your device.

Open the tool ↗

Last updated: 2026-05-06 · Author: Ahsan Mahmood · Edit this page on GitHub