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고다혜: [CT] 언어별 개발자 분류하기_241112

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	`1`	`+WITH FE AS (`
	`2`	`+ SELECT SUM(CODE) CODE`
	`3`	`+ FROM SKILLCODES`
	`4`	`+ WHERE CATEGORY = "Front End"`
	`5`	`+)`
	`6`	`+ , C AS (`
	`7`	`+ SELECT CODE`
	`8`	`+ FROM SKILLCODES`
	`9`	`+ WHERE NAME = "C#"`
	`10`	`+)`
	`11`	`+ , PYTHON AS (`
	`12`	`+ SELECT CODE`
	`13`	`+ FROM SKILLCODES`
	`14`	`+ WHERE NAME = "Python"`
	`15`	`+), DEVELOPER_GRADE AS (`
	`16`	`+ SELECT`
	`17`	`+ CASE`
	`18`	`+ WHEN a.SKILL_CODE & b.CODE != 0 AND a.SKILL_CODE & d.CODE != 0 THEN 'A'`
	`19`	`+ WHEN a.SKILL_CODE & c.CODE != 0 THEN 'B'`
	`20`	`+ WHEN a.SKILL_CODE & b.CODE != 0 THEN 'C'`
	`21`	`+END AS GRADE,`
	`22`	`+ a.ID, a.EMAIL`
	`23`	`+ FROM DEVELOPERS a, FE b, C c, Python d`
	`24`	`+)`
	`25`	`+`
	`26`	`+SELECT GRADE, ID, EMAIL`
	`27`	`+FROM DEVELOPER_GRADE`
	`28`	`+WHERE GRADE IS NOT NULL`
	`29`	`+ORDER BY GRADE, ID`

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