Tool description

SQL Query Tester is an online SQL query analyzer that helps you check SQL for errors and validate queries across multiple database dialects. This MySQL online tester parses SQL statements, validates their syntax, and provides detailed Abstract Syntax Tree (AST) visualization to help developers understand and debug their SQL code. Whether you need to check your SQL query for syntax issues or analyze complex statements, this tool provides instant validation and detailed error reporting.

Features

  • Multi-Dialect Support: Validate queries for MySQL, PostgreSQL, SQLite, MariaDB, BigQuery, and T-SQL (Microsoft SQL Server)
  • Check SQL for Errors: Instantly verify if your SQL query is syntactically correct for the selected database dialect
  • AST Visualization: View a detailed tree structure of your parsed SQL query showing its components and structure

Supported SQL Dialects

  • MySQL: Popular open-source relational database management system
  • PostgreSQL: Advanced open-source relational database with extensive features
  • SQLite: Lightweight embedded database engine
  • MariaDB: Community-developed fork of MySQL
  • BigQuery: Google Cloud's enterprise data warehouse
  • T-SQL (Transact-SQL): Microsoft SQL Server's SQL extension

What is an Abstract Syntax Tree (AST)?

An Abstract Syntax Tree is a hierarchical representation of the syntactic structure of your SQL query. It breaks down the query into its fundamental components (SELECT clauses, FROM clauses, WHERE conditions, etc.) in a tree format, making it easier to understand the query's logic and flow.