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- MySQL?? Decode ??? ???? From_base64 ? AES_Decrypt? ???? ????????. 1. from_base64? ???? selectfrom_base64 ( 'sgvsbg8gv29ybgq =')? ?? Base64 ???? decode????. 2. aes_decrypt? ???? selectaes_decrypt (encrypted_data, 'secret_key')? ?? AES ???? ?????.
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- MySQL?? WHER ?? ??? ??? ? ??? ??? ?????. ???? ??? ????. 1. ?? ?? : SelectColumn1, collect2fromtable_namewherecondition; 2. ?? ??? : ??? ???? ? ?????. 3. ?? ??? ? ?? : ?? ??, IN, Like ?? ?? ?; 4. ?? ??? : ?? ??? ??? ?? ?? ? ??? ??? ??????? ??????. WHERE ?? ????? ?? ???? ????? ??? ???? ?? ? ????.
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- MySQL?? DESC ???? ???? ?? ?? ? ??? ??? ?? ?? ? ??? ? ????. 1. ???? ??? ? : select*fromstudentSorderByscoredEsc; ?? : DESC? Orderby ?? ?? ???????. ?? ?? ???? ??? CreateIndexIdx_scoreonstudents (score)? ?? ??? ? ? ????. 2.?? ??? ?? ?? ?? : Descstudents; ?? : ShowCreateTableStudents? ???? ? ?? ??? ????? ??? ??? ??????? ??? ? ????.
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- ?? ??? ?? MySQL? ?? ??? ????? ???? ??? ?????. 1. ???? ??? CreateTable ?? ???? ??? ??? ?????. 2. insertinto ?? ???? ???? ???? ???? ??????. 3. SELECT ?? ???? ???? ???? ???? ???. 4. ???? ?????? ???? ?? ???? ???? ?????. 5. ???? ???? ?? ???? ???? ???? ??????. ??? ??? ????? ?????? ??? ?? ??? ???? ??? ? ??? ???? ???? ???? ???? ??? ?? ? ??? ?????.
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- MySQL?? AS? ??. Keyword Alias? ??? ?? ??? ??.
- MySQL?? AS ???? ??? ??? ?? ?? ?? ??? ??? ????. 1) ??? ??? ??? ????? ?? ?? ???? ??. 2) ?? ??? ???? ??; 3) ?? ??? ???? ?? ? Orderby ?? GroupBy?? ?? ? ??? ???? ???? ??????. 4) ??? Optimizer? ????? ????? ???? ???? ?? ??? ????? ? ??????.
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- MySQL : varchar ?? ???? ????????
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