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이지영: [SQL] 특정 형질을 가지는 대장균 찾기_241115

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	`1`	`+-- https://school.programmers.co.kr/learn/courses/30/lessons/301646`
	`2`	`+-- 특정 형질을 가지는 대장균 찾기`
	`3`	`+`
	`4`	`+-- 방법 1. 비트연산 활용`
	`5`	`+-- 1)`
	`6`	`+SELECT COUNT(ID) AS COUNT`
	`7`	`+FROM ECOLI_DATA`
	`8`	`+WHERE (GENOTYPE & 2 != 2) AND (GENOTYPE & 1 = 1 OR GENOTYPE & 4 = 4)`
	`9`	`+-- 2)`
	`10`	`+SELECT COUNT(ID) AS COUNT`
	`11`	`+FROM ECOLI_DATA`
	`12`	`+WHERE (GENOTYPE & 2 != 2) AND (GENOTYPE & 5 > 5)`
	`13`	`+`
	`14`	`+-- 방법 2. 2진수로 나타내기`
	`15`	`+SELECT CONV(GENOTYPE, 10, 2) MOD 10 AS ONE,`
	`16`	`+ (CONV(GENOTYPE, 10, 2) MOD 100) DIV 10 AS TWO,`
	`17`	`+ (CONV(GENOTYPE, 10, 2) MOD 1000) DIV 100 AS THREE`
	`18`	`+FROM ECOLI_DATA`
	`19`	`+`
	`20`	`+SELECT COUNT(*) AS COUNT`
	`21`	`+FROM ECOLI_DATA E,`
	`22`	`+ (SELECT CONV(GENOTYPE, 10, 2) MOD 10 AS ONE,`
	`23`	`+ (CONV(GENOTYPE, 10, 2) MOD 100) DIV 10 AS TWO,`
	`24`	`+ (CONV(GENOTYPE, 10, 2) MOD 1000) DIV 100 AS THREE,`
	`25`	`+ ID`
	`26`	`+ FROM ECOLI_DATA) G`
	`27`	`+WHERE E.ID = G.ID AND G.TWO = 0 AND (G.ONE = 1 OR G.THREE = 1);`

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