Database Schema Generator
Design clean database schemas from a simple description
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Ever drawn a schema on a whiteboard, then lost an hour turning it into real DDL? Table names are the easy part. The join table nobody mentioned, the foreign key with the wrong delete rule, the column that should have been unique from day one: those are the parts that hurt later. The Database Schema Generator takes a plain description of your data and writes the tables, keys and constraints for you.
Short answer: Database Schema Generator is a free AI tool on EizTools. It reads a written description of your data and returns a database schema with tables, columns, relationships, indexes and constraints for the engine you pick.
What is Database Schema Generator?
Database Schema Generator is a single screen tool for the design step that usually happens in a notebook. You describe the entities, the fields and how they relate. It answers with the structure: table definitions, primary and foreign keys, sensible column types and the indexes worth having. It never touches a live server. It reads your description and writes text back.
What A Generated Schema Gives You
Tables and relations
One paragraph about your app becomes tables with typed columns, plus the join table a many to many relationship needs.
Indexes included
Include Indexes is on by default, so the columns you filter and sort by come back with index suggestions attached.
Constraints written in
Add Constraints puts NOT NULL, unique keys and foreign key rules into the output instead of leaving them for later.
How Does Database Schema Generator Work?
Describe the data in the prompt box. Entities, the fields each one holds, and the relationships between them. Pick a model from the selector, then open Advanced options and set your engine, because column types differ across engines. Press Generate and the schema appears in the output card, ready to copy or download. If you only need one query against tables that already exist, the SQL Generator is the faster route. The activity history panel holds your earlier attempts for the session.
Picking The Database, Output Type And Format
Complexity starts on Standard and the Detail Level slider starts at 60 percent. These four settings change the result most.
| Setting | What it decides | Where to start |
|---|---|---|
| Database | Column types and engine syntax | PostgreSQL, or your real engine |
| Output Type | Schema, migration, diagram or query | Schema |
| Complexity | How far normalisation is taken | Advanced for anything with reporting |
| Format | How the answer is laid out | Code + Comments |
Include Sample Data is the one toggle that starts off. Switch it on when you want a few seed rows to test against. Custom Instructions is where naming rules go, such as plural table names or a shared prefix.
Where Schema Briefs Go Wrong
- Describing screens, not data. Say what a booking holds, not what the booking page shows.
- Leaving Database on None. Generic SQL often uses a type your engine rejects.
- Asking for the whole product at once. Generate one area, then the next, and keep the key names consistent.
- Skipping the counts. A table with millions of rows needs different indexes to one with a few hundred.
Warning: Nothing here runs against your database. Apply any generated schema or migration to a copy first, check the plan, and only then take it near production data.
Designing a schema here is free, with no account and no daily limit, and you can switch the model from the selector before each run. EizTools files the Database Schema Generator under coding tools, next to the query, migration and documentation helpers. That makes it easy to design a table and query it in the same sitting.
Frequently Asked Questions
Which databases can it target?
Set the Database dropdown to your real engine, PostgreSQL or MySQL or whichever you run, and the column types, auto increment syntax and index statements all come back matching it rather than generic SQL.
Can it write a migration instead of raw SQL?
Yes. Set Output Type to Migration and name your framework in the prompt. You get an up and down structure you can adapt. Always run it on a copy of the database first.
Does the Database Schema Generator connect to my database?
No. There is no connection string, no credentials and no access to your server. It reads what you type and writes text back, so nothing is executed on your side by the tool itself.
How do I get an ER diagram out of it?
Set Output Type to ER Diagram and Format to Table or Explained. The result describes entities and relationships in text you can paste into a diagram tool rather than a rendered picture.
Is the generated schema normalised?
Usually to third normal form at Standard complexity. Set Complexity to Advanced for stricter separation, or say in the prompt that you want a denormalised reporting table and it will follow that instead.
A schema is the one decision that stays expensive to change once data lands in it. Getting a structured first draft in a minute gives you something to argue with, which beats an empty file and a whiteboard photo. Describe your data properly, set the engine, and read the Database Schema Generator output like a design review before anything runs.
Sabir Bepari
Founder of EizTools and a passionate AI enthusiast dedicated to building practical, user-friendly AI tools that simplify everyday tasks.
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