SQL Validator - Koddit

SQL Validator | Check SQL Syntax | Koddit

Validate SQL Query

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Enter SQL Query:

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Enter your SQL query and select a dialect to validate its syntax.

Understanding SQL Syntax

What is SQL?

SQL (Structured Query Language) is a standard language for storing, manipulating, and retrieving data in relational databases. SQL statements are used to perform tasks such as updating data or retrieving data from a database.

Different database systems may implement SQL slightly differently, which is why our validator supports multiple SQL dialects including MySQL, PostgreSQL, SQLite, and T-SQL (SQL Server).

Common SQL Syntax Errors

Here are some common SQL syntax errors that our validator can help you identify:

Missing semicolons - Forgetting to end SQL statements with semicolons
Incorrect quotes - Using the wrong type of quotes for string literals
Reserved keywords - Using SQL reserved words as table or column names without proper escaping
Mismatched parentheses - Not properly closing parentheses in complex queries
Incorrect JOIN syntax - Improper JOIN clause structure

SQL Examples

Here are some example SQL queries you can try in our validator:

Basic SELECT Query

                    SELECT id, first_name, last_name FROM users WHERE status = 'active' ORDER BY last_name;
                

JOIN Example

                    SELECT o.order_id, c.customer_name, o.order_date 
                    FROM orders o
                    INNER JOIN customers c ON o.customer_id = c.customer_id
                    WHERE o.order_date > '2023-01-01';
                

INSERT Statement

                    INSERT INTO products (product_name, price, category_id)
                    VALUES ('New Product', 29.99, 3);
                

UPDATE Statement

                    UPDATE employees
                    SET salary = salary * 1.1
                    WHERE department_id = 5 AND hire_date < '2022-01-01';
                

SQL Dialect Differences

Different database systems have their own SQL dialects with unique features and syntax. Here are some key differences:

MySQL - Uses backticks (`) for identifiers, AUTO_INCREMENT for sequence columns
PostgreSQL - Uses SERIAL or IDENTITY for auto-incrementing, supports RETURNING clause in DML statements
SQLite - Simplified syntax, limited ALTER TABLE support, dynamic typing
SQL Server (T-SQL) - Uses square brackets [] for identifiers, IDENTITY for auto-incrementing, TOP instead of LIMIT

Our validator attempts to check your query against the specific rules of your selected dialect to provide the most accurate feedback.