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Editorial Team
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Asked: 2026-05-14T02:40:08+00:00

Why does the MySQL query below give error 1066 (Not unique table/alias: ‘customer’) ?

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Why does the MySQL query below give error 1066 (Not unique table/alias: 'customer')?

SELECT customer.id, customer.firstName, account.id
FROM customer, account
INNER JOIN customer
ON customer.id = account.customerId 
ORDER BY customer.id
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1 Answer

  1. Editorial Team

    You have listed the table customer twice in your FROM statement. Here’s the fixed version:

    SELECT customer.id, customer.firstName, account.id
FROM account
INNER JOIN customer
ON customer.id = account.customerId
ORDER BY customer.id
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