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SQL CREATE TABLE Generator - Online Visual Schema Builder

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SQL CREATE TABLE Generator

Visual Schema Builder — Design your database tables and generate perfect SQL instantly
Column Definitions 3 columns
# Column Name Type Size/Prec NULL? Default PK AI UQ Idx Comment Actions
Generated SQL
-- Your SQL will appear here...

Frequently Asked Questions

What is a SQL CREATE TABLE statement?
A CREATE TABLE statement is a SQL command that defines a new table in a relational database. It specifies the table name, column names, data types, constraints (like PRIMARY KEY, NOT NULL, UNIQUE), and other properties. This is the foundational step in database schema design — every table in your database starts with a CREATE TABLE statement.
Which database dialects are supported and why does it matter?
This tool supports MySQL/MariaDB, PostgreSQL, SQLite, SQL Server, and Oracle. Each database has slightly different syntax — for example, auto-increment is AUTO_INCREMENT in MySQL, SERIAL in PostgreSQL, IDENTITY(1,1) in SQL Server, and GENERATED BY DEFAULT AS IDENTITY in Oracle. Choosing the correct dialect ensures your SQL runs without errors on your target database.
What's the difference between PRIMARY KEY, UNIQUE, and INDEX?
PRIMARY KEY uniquely identifies each row and automatically implies NOT NULL + UNIQUE. Each table can have only one primary key. UNIQUE ensures all values in a column are distinct but allows NULL values (in most databases). INDEX speeds up searches on a column without enforcing uniqueness — ideal for columns frequently used in WHERE clauses like email or username lookups.
When should I use VARCHAR vs TEXT?
Use VARCHAR(n) when you know the maximum length (e.g., names, emails, zip codes) and want to enforce a limit. VARCHAR is stored inline with the row and is faster for shorter strings. Use TEXT for unbounded or very long content (e.g., blog posts, descriptions, JSON blobs) — it's stored separately and has no practical length limit. VARCHAR is generally preferred for indexed columns.
What does NULL vs NOT NULL mean and why should I care?
NULL means the column can have no value (unknown/missing). NOT NULL enforces that every row must have a value for that column. Best practice: use NOT NULL for required fields (like email, username) and allow NULL only for optional data (like middle name, avatar URL). NOT NULL columns can improve query performance and prevent accidental missing data.
How do I use the generated SQL file?
Copy the SQL or download the .sql file, then run it in your database client (like MySQL Workbench, pgAdmin, DBeaver, or the command line). For MySQL: mysql -u root -p database_name < file.sql. For PostgreSQL: psql -U postgres -d database_name -f file.sql. Always test on a development database first before running on production.
Can I add foreign keys using this tool?
This tool focuses on single-table schema design. Foreign keys reference columns in other tables, which requires those tables to exist first. After generating your base tables, you can manually add FOREIGN KEY (column) REFERENCES other_table(id) constraints using ALTER TABLE statements. We recommend designing all your tables first, then adding foreign keys in a separate migration step.
What are best practices for naming tables and columns?
Use snake_case (e.g., user_orders) for maximum compatibility across databases. Table names should be plural nouns (users, products). Column names should be descriptive but concise. Avoid reserved keywords (like order, group, select) as column names. Use consistent naming — if you use created_at in one table, don't use create_date in another.
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