How to use the SQL JOIN Builder
1. Enter the two table names and optional aliases (e.g. u for users).
2. Choose the join type and write the ON condition using your column names.
3. Specify which columns to SELECT. Add optional WHERE, ORDER BY, and LIMIT. The SQL builds live.
What is it?
SQL JOINs combine rows from two tables based on a related column. INNER JOIN returns only matching rows; LEFT JOIN returns all rows from the left table plus matches from the right; RIGHT JOIN is the reverse; FULL OUTER JOIN returns all rows from both sides; CROSS JOIN produces every combination.
Aliases (short names like u for users) make queries more readable, especially when selecting columns from both tables. This builder generates the full SELECT statement with your chosen join type, columns, and conditions.
Benefits
Generate INSERT and CREATE TABLE statements instantly
Convert JSON, CSV, or a field list into ready-to-run SQL in seconds — no manual quoting, no counting columns, no copy-paste errors from spreadsheet data.
Build SELECT queries without memorising syntax
The visual query builder constructs WHERE conditions, ORDER BY, LIMIT, and DISTINCT clauses interactively — useful for anyone who writes SQL occasionally rather than daily.
Migrate between MongoDB and relational databases
Convert MongoDB find, insert, update, and delete operations directly to SQL equivalents — speed up data migration planning or schema exploration.
All your data stays in the browser
No SQL query, schema definition, or database content is ever uploaded to a server. Everything runs entirely client-side, making these tools safe to use with sensitive data.
Frequently asked questions
What's the difference between LEFT JOIN and INNER JOIN?
INNER JOIN returns only rows that have a match in both tables. LEFT JOIN returns every row from the left table, with NULLs for unmatched columns from the right table.
Can I join more than two tables?
This tool builds a two-table join. For more tables, copy the output and add another JOIN clause manually.