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DiagramDB / SQL Server Syntax Checker

SQL Server Syntax Checker

Validate T-SQL for Microsoft SQL Server and Azure SQL: TOP, square-bracket identifiers, OFFSET … FETCH and T-SQL functions.

SQL Server (T-SQL) errors this catches, and how to fix them

  • LIMIT. SQL Server has no LIMIT. Use SELECT TOP (n) or ORDER BY … OFFSET n ROWS FETCH NEXT m ROWS ONLY.
  • OFFSET without ORDER BY. OFFSET/FETCH requires an ORDER BY clause.
  • String concatenation with ||. Use + or CONCAT(); || is not a T-SQL operator for strings.
  • Booleans. There is no TRUE/FALSE literal for columns. Use BIT with 1 and 0.
  • Batch separator GO. GO is a client command (SSMS, sqlcmd), not T-SQL, so parsers report it as an error. Remove it before checking.

Need to move this query to another database? The SQL dialect converter rewrites it and lists every change. To make it readable first, use the SQL formatter.

Other dialects

MySQL Syntax Checker · PostgreSQL Syntax Checker · SQLite Syntax Checker · MariaDB Syntax Checker · BigQuery SQL Validator · Snowflake SQL Validator · Redshift SQL Validator · All dialects

Questions

Is this SQL Server (T-SQL) syntax checker free and private?

Yes. The SQL Server (T-SQL) grammar is downloaded once and your SQL is parsed in the browser, so nothing is uploaded. Only the optional “Explain & fix with AI” button sends the failing statement to an AI model.

Does it check that my SQL Server (T-SQL) tables and columns exist?

No. It checks syntax only, because it never connects to your database. Valid statements list the tables and columns they reference so you can compare them yourself; EXPLAIN on a development database checks the names for real.

Which SQL Server (T-SQL) versions are covered?

The grammar comes from the open-source node-sql-parser project and targets current SQL Server (T-SQL) syntax. Very new features or vendor extensions can be flagged as errors even when the server accepts them; confirm those with the official SQL Server (T-SQL) documentation.

Why does SQL Server (T-SQL) reject lIMIT?

SQL Server has no LIMIT. Use SELECT TOP (n) or ORDER BY … OFFSET n ROWS FETCH NEXT m ROWS ONLY.

Why does SQL Server (T-SQL) reject oFFSET without ORDER BY?

OFFSET/FETCH requires an ORDER BY clause.

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