SQL

1.SQL 기초 - DataBase 사용

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2.SQL 기초 -Table, 기초 명령어

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3.SQL 기초 - 비교 연산자

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4.SQL 기초 - 논리 연산자

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5.SQL 기초 - UNION

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6.SQL 기초 - JOIN

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7.SQL 기초 - CONCAT 등

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8.SQL - SQL file

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9.SQL - SQL file 문제

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10.SQL - Python with MySQL

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11.SQL - Python with CSV

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12.SQL - PRIMARY KEY, FOREIGN KEY

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13.SQL - Foreign key 예제

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14.SQL - 집계함수

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15.SQL - scalar Functions

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16.SQL -Subquery

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17.SQL 연습 _1

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