About the SQL Schema Builder
Designing a schema by writing raw DDL invites inconsistency — forgotten NOT NULLs, missing foreign key indexes, type choices that differ table to table. This visual builder lets you define tables, columns, and relationships and generates the CREATE TABLE statements for PostgreSQL, MySQL, or SQLite with correct dialect-specific types.
Dialect differences are the real value: auto-increment is SERIAL/IDENTITY in PostgreSQL, AUTO_INCREMENT in MySQL, and AUTOINCREMENT in SQLite; boolean, timestamp, and text types all vary. The builder emits the right syntax per engine instead of one lowest-common-denominator script.
Frequently asked questions
Should I use SERIAL or IDENTITY in PostgreSQL?
GENERATED ALWAYS AS IDENTITY is the modern standard (Postgres 10+): it is SQL-standard, prevents accidental manual inserts into the sequence, and handles permissions more cleanly than SERIAL's implicit sequence. SERIAL still works but is effectively legacy; new schemas should use IDENTITY.
Does a foreign key automatically create an index?
In MySQL/InnoDB yes; in PostgreSQL no — and that asymmetry causes real incidents. An unindexed FK in Postgres makes every parent-row delete or update scan the child table, and it serializes locks. Rule of thumb for Postgres: every REFERENCES column gets an explicit index unless you have measured a reason not to.
VARCHAR(n) or TEXT in PostgreSQL?
They perform identically in Postgres — TEXT is not slower, and VARCHAR(n) only adds a length check constraint. Use TEXT by default and enforce business-rule lengths with CHECK constraints where they matter. In MySQL the calculus differs: VARCHAR is stored in-row while TEXT may be off-page, so VARCHAR is generally preferred there.
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