336x280(권장), 300x250(권장), 250x250, 200x200 크기의 광고 코드만 넣을 수 있습니다.
- Table : Basic unit of storage; composed of rows
Can be created at any time.
- View : Logically represents subsets of data from one or more tables
- Sequence : Generates numeric values
- Index : Imporves the performance of some queries
- Synonym : Gives alternative names to object
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