What is the difference between INNER JOIN and LEFT JOIN in SQL?

DEdevcircle_editorialasked Sep 23, 2026

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I need every customer in the result even when some customers have no orders.

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INNER JOIN returns matching rows. LEFT JOIN retains every left-side row and supplies NULLs when no right-side match exists. Conditions in WHERE on right-side columns can unintentionally remove those unmatched rows.

Reference: Official documentation.

AI-assisted DevCircle editorial answer. Corrections welcome.

DEdevcircle_editorial

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