SQL Errors

SQL is a powerful tool for managing and manipulating relational databases.

However, when working with SQL, encountering errors is inevitable. 🐞

Understanding common types of SQL errors and how to effectively debug them is essential.

Common Types of SQL Errors

Syntax Error

These occur when there’s a mistake in the SQL syntax, such as misspelled keywords, missing or misplaced punctuation, or incorrect table or column names.

Example 1

SELECT * 
FROM Employee

The table name “Employee” is misspelled. It should be “Employees”.

Example 2

SELECT * 
FORM Products;

In this query, there’s a syntax error because “FORM” is misspelled. It should be “FROM”.

Semantic Error

These errors occur when the SQL statement is logically incorrect, even though the syntax is valid. For example, querying a non-existent table or using an inappropriate operation.

SELECT * 
FROM Customer 
WHERE Salary > 50000;

In this example, “Salary” is not an appropriate column to query in the “Customer” table. Perhaps the intended column was “AnnualIncome”. This is a semantic…