mysql - Storing 'debits' and 'credits' to maintain a 'transactions' table -

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लेनदेन तालिका के लिए कौन सा बेहतर स्कीमा है: 

  customer_id प्रकार (enum, डेबिट 'या' क्रेडिट ') राशि (दशमलव, अहस्ताक्षरित)

या 

  ग्राहक_आईडी राशि (दशमलव, हस्ताक्षरित ... नकारात्मक संख्या डेबिट हैं, सकारात्मक दूसरा सौदा सरल लगता है, लेकिन मैं चिंतित हूं कि मुझे कुछ संभावित नुकसान याद आ रही हैं।

दूसरा, आसान और अधिक कुशल है भविष्य में पूछना आसान हो जाता है, खासकर शेष के लिए।


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