试试这个：
SELECt t.*, amount - (SELECT amount FROM transactions prev WHERe prev.date_end < t.date_start ORDER BY date_start DESC LIMIT 1) AS changes FROM transactions t
试试这个：
SELECt t.*, amount - (SELECT amount FROM transactions prev WHERe prev.date_end < t.date_start ORDER BY date_start DESC LIMIT 1) AS changes FROM transactions t
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