Show the account id with most number of transactions.
CREATE TABLE Financial_transactions (account_id VARCHAR)
SELECT TOP 1 account_id FROM Financial_transactions GROUP BY account_id ORDER BY COUNT(*) DESC
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE Financial_transactions (account_id VARCHAR) Question: Show the account id with most number of transactions. [/INST] SELECT TOP 1 account_id FROM Financial_transactions GROUP BY account_id ORDER BY COUNT(*) DESC </s>