SQL-BASICS5 MIN READ
Coach a LEFT JOIN Review
Explain ON-vs-WHERE behavior in a LEFT JOIN code review.
Nia N Junior Analyst S Symptom M Mechanism F Fix Review moment 20 sec The bug Nia wrote a LEFT JOIN from accounts to renewals, then WHERE renewals.renewal_date >= CURRENT_DATE. Accounts without renewals vanished. The report is specifically about accounts that do and do not have renewal dates. 418 accounts expected 291 after WHERE
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