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SQL CREATE TABLE Generator

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出力

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ガイド

SQL CREATE TABLE Generator

The SQL CREATE TABLE Generator helps developers and database administrators quickly build accurate DDL (Data Definition Language) statements for MySQL, PostgreSQL, SQLite, and SQL Server. Define your columns, data types, constraints, and indexes through a visual interface and get production-ready SQL instantly.

使用方法

Select your SQL dialect (MySQL, PostgreSQL, SQLite, or SQL Server), enter a table name, then add columns by clicking “Add Column”. For each column choose the data type, set a length if needed, and check any constraints (PRIMARY KEY, AUTO INCREMENT, NOT NULL, UNIQUE). Optionally fill in a default value or foreign key reference. Add indexes using “Add Index” — name the index, choose INDEX or UNIQUE, and list the columns. The generated CREATE TABLE statement updates in real time as you type.

機能

4 SQL Dialects – MySQL, PostgreSQL, SQLite, and SQL Server with correct type and syntax mapping per dialect.
Dynamic Column Builder – Add, remove, and reorder columns with drag-style up/down controls.
Type-aware Defaults – Length fields auto-populate with sensible defaults (e.g. VARCHAR(255), DECIMAL(10,2)).
Auto-increment Support – Emits AUTO_INCREMENT for MySQL, IDENTITY(1,1) for SQL Server, BIGSERIAL/SERIAL for PostgreSQL, and AUTOINCREMENT for SQLite automatically.
Composite Primary Keys – Multiple PK columns are emitted as a table-level constraint.
Foreign Key Constraints – Specify references in a simple “table(column)” format and get FOREIGN KEY constraints generated.
Index Generation – Create standard and unique indexes; MySQL emits inline KEY/UNIQUE KEY, other dialects emit separate CREATE INDEX statements.
整形 – Toggle between readable multi-line and compact single-line output.
コピー＆ダウンロード – Copy the SQL to clipboard or download as a .sql file.

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 よくある質問

What is DDL in SQL?

DDL stands for Data Definition Language — the subset of SQL used to define and manage database structures such as tables, indexes, and constraints. CREATE TABLE, ALTER TABLE, and DROP TABLE are all DDL statements.
What is the difference between PRIMARY KEY and UNIQUE constraints?

A PRIMARY KEY uniquely identifies each row and cannot be NULL. A UNIQUE constraint also enforces uniqueness but allows NULL values (in most databases). A table can have only one PRIMARY KEY but multiple UNIQUE constraints.
What is a foreign key and why is it used?

A foreign key is a column (or set of columns) in one table that references the PRIMARY KEY of another table. It enforces referential integrity, ensuring that values in the child table always correspond to a valid row in the parent table.
What is the difference between CHAR and VARCHAR?

CHAR is a fixed-length character type that always uses the declared storage size, padding shorter values with spaces. VARCHAR is variable-length and only uses the storage needed for the actual value plus a small overhead, making it more space-efficient for variable data.