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Find the SQL Bug
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Find the SQL Bug

MediumSQL · PostgreSQL

Problem

What is wrong with this SQL statement?

Review the PostgreSQL query below and provide a corrected version. It is intended to report accounts whose settled, positive card transactions total at least 100.

SELECT a.account_id, a.account_name,
       SUM(t.amount) AS settled_total,
       COUNT(t.transaction_id) AS transaction_count
FROM accounts a
LEFT JOIN card_transactions t
  ON a.account_id = t.account_id
WHERE t.status = 'settled'
  AND t.amount > 0
GROUP BY a.account_id
HAVING settled_total >= 100
ORDER BY settled_total DESC;

Output

  1. One row per qualifying account.
  2. Columns: account_id, account_name, settled_total, and transaction_count.
  3. Include only accounts with settled positive transactions totaling at least 100.
  4. Order by total descending, then account_id ascending.

Schema

accounts
ColumnTypeDescription
account_idPKINTUnique account identifier
account_nameVARCHAR(100)Account display name
card_transactions
ColumnTypeDescription
transaction_idPKINTUnique card transaction identifier
account_idINTAccount associated with the transaction
statusVARCHAR(20)Transaction processing status
amountNUMERIC(12,2)Transaction amount
Tablesaccountscard_transactions
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CodePostgreSQL
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