Database

1.SQL vs NoSQL

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2.키(Key) 정리

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3.SQL - JOIN

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4.SQL Injection

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5.정규화(Normalization)

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6.이상(Anomaly)

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7.인덱스(INDEX)

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8.트랜잭션(Transaction)

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9.트랜잭션 격리 수준(Transaction Isolation Level)

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