Comment utiliser : MySQL Syntax Checker
- Choose your database dialect (MySQL, PostgreSQL, SQL Server, SQLite, BigQuery and more).
- Paste or open your SQL — several statements separated by semicolons are fine.
- Errors show the line, column and the expected tokens, with the faulty spot marked.
- Valid statements are listed with their type and the tables they touch, plus warnings for risky patterns.
What does a SQL validator check?
A SQL validator (or syntax checker) parses your query with the grammar of a specific database and tells you whether it is well formed: balanced parentheses, keywords in the right order, valid expressions, commas between columns and so on. This one splits your script into statements, parses each one separately so you see every broken statement at once, and points at the line and column where parsing stopped. The MySQL grammar is selected by default.
Best-practice warnings
| Warning | Why it matters |
|---|---|
UPDATE / DELETE without WHERE | Changes every row in the table — usually a mistake. |
SELECT * | Fetches columns you may not need and breaks when columns are added or reordered. |
INSERT without a column list | Depends on column order; adding a column breaks it. |
LIKE '%…' | A leading wildcard cannot use a normal index and scans the table. |
= NULL | Never true; use IS NULL. |
ORDER BY without LIMIT in a subquery, or LIMIT without ORDER BY | Row order is not guaranteed without an explicit sort. |
Dialect differences that cause errors
- Identifier quotes — MySQL and MariaDB use backticks (
`order`), PostgreSQL, SQLite and the SQL standard use double quotes, SQL Server uses square brackets ([order]). - Row limits —
LIMIT 10in MySQL, PostgreSQL and SQLite;TOP 10orOFFSET … FETCHin SQL Server. - Upserts —
ON DUPLICATE KEY UPDATE(MySQL) vsON CONFLICT … DO UPDATE(PostgreSQL, SQLite) vsMERGE(SQL Server, Snowflake, BigQuery). - Casts — PostgreSQL accepts
value::int; most others needCAST(value AS INT).
Common MySQL syntax errors
MySQL’s own message, “You have an error in your SQL syntax… near '…' at line 1”, quotes the text from the point where parsing failed. Frequent causes are reserved words used as names (order, group, key — wrap them in backticks), a trailing comma before FROM, double quotes for identifiers (MySQL treats them as strings unless ANSI_QUOTES is on) and a missing comma between columns.
Make the query readable with the SQL formatter, generate statements from data with CSV to SQL or JSON to SQL, and design tables with the CREATE TABLE generator.
Aussi recherché comme : mysql query validator, check mysql syntax, mysql syntax error, mysql linter, mariadb syntax checker.
Outils complémentaires : MySQL Syntax Checker
- SQL Validator — Paste one query or a whole script to check its syntax against the grammar of your database.
- PostgreSQL Syntax Checker — Validate PostgreSQL queries in your browser.
- Excel to JSON — Open an .xlsx workbook or paste cells straight from Excel or Google Sheets and get clean JSON.
- JSON to Excel — Turn a JSON array into a real Excel workbook.
Questions fréquentes
Is my SQL sent to a server or a database?
Does a valid result mean the query will run?
Why does the error point after my mistake?
WHER is often read as an alias, so the error appears on the next word. Check the token just before the marked position too.