Schema DDL Generator
Auto-generate CREATE TABLE SQL DDL from a CSV file structure. Processed entirely in your browser for 100% data privacy and ze
Your files never leave your device. Processed locally. 100% private.
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How To Use Schema DDL Generator
Complete your task perfectly in just three straightforward steps.
Upload CSV
Drop your CSV file.
Configure
Choose SQL dialect, table name, and adjust auto-detected column types.
Download SQL
Download the CREATE TABLE DDL statement.
FAQ
Everything you need to know about the Schema DDL Generator.
What SQL dialects are supported?
PostgreSQL, MySQL, SQLite, SQL Server, and BigQuery.
Are data types auto-detected?
Yes — INTEGER, FLOAT, DATE, BOOLEAN, and VARCHAR with inferred lengths.
Is my file uploaded?
No. Everything runs locally in your browser.
File size limit?
Process files up to the browser memory limit.
Can I add indexes to the DDL?
Yes — add PRIMARY KEY and INDEX definitions before downloading.
Can I customize the table name?
Yes. There is a table name input field above the generated DDL. By default it uses raw_data_import. Change it to your desired table name before copying — the table name is embedded throughout the CREATE TABLE statement.
How accurate is the type inference on messy real-world data?
Type inference is accurate for clean, consistently-typed columns. Edge cases to watch: mixed-type columns (e.g., a column with mostly numbers but some text like 'N/A') will fall through to VARCHAR — use CSV Repair or the Cleaner tool to standardize nulls first. Dates in non-ISO formats (e.g., 15-Jan-2024) may not be detected as TIMESTAMP — use the Date Fixer tool to standardize them to YYYY-MM-DD first.
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