How to Resolve 'Unrecognized name: employees at [9:8]' Error in BigQuery?

Error: "Unrecognized name: employees at [9:8]"

You may encounter an "Unrecognized name: employees at [9:8]" error when using table aliases. Let us analyze its causes and provide the right solutions.

Error analysis:

In the provided SQL query:

<code class="language-sql">SELECT 
    employees.name AS employee_name,
    employees.role AS employee_role,
    departments.name AS department_name
FROM 
    `strange-calling-318804.employee_data.Employees`
    JOIN 
    `strange-calling-318804.employee_data.departments` 
    ON employees.department_id = departments.department_id</code>

uses ON and employees in a departments clause Alias:

<code class="language-sql">ON employees.department_id = departments.department_id</code>

However, the Employees and departments tables do not have aliases explicitly defined in the FROM clause. This caused the error because BigQuery requires that aliases must be defined before they can be used.

Solution:

To resolve this error, aliases must be defined before using them:

<code class="language-sql">SELECT 
    employees.name AS employee_name,
    employees.role AS employee_role,
    departments.name AS department_name
FROM 
    `strange-calling-318804.employee_data.Employees` AS employees
    JOIN 
    `strange-calling-318804.employee_data.departments` AS departments 
    ON employees.department_id = departments.department_id</code>

By adding the aliases AS employees and AS departments after the full table reference, queries now correctly identify the table and execute without errors.

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