MYSQL LEFT JOIN 未按预期工作未显示左表中的所有行

Question

I have the following structure for form_meta

and entry_meta

I am running this query

SELECT 
    sequence AS sequence,
    meta_label AS label,
    results AS results,
    entry_id
FROM
    `form_meta`
        LEFT JOIN
    `entry_meta` ON form_meta.id = entry_meta.form_meta_id
WHERE
    `form_meta`.`form_id` = 10
        AND is_active = 1

But, I am getting 4 rows as result. I am looking for 5 rows as form_meta is having 5 rows, last row must be empty.

Answer 1

What happens if you use proper table aliases?

SELECT 
    fm.sequence AS sequence,
    fm.meta_label AS label,
    em.results AS results,
    em.entry_id
FROM form_meta fm
LEFT JOIN entry_meta em ON fm.id = em.form_meta_id
WHERE fm.form_id = 10 AND fm.is_active = 1;