๋ณธ๋ฌธ ๋ฐ”๋กœ๊ฐ€๊ธฐ
  • What would life be If we had no courage to attemp anything?

Problem Solving/SQL9

[ํ”„๋กœ๊ทธ๋ž˜๋จธ์Šค] MySQL - SELECT | ๊ณผ์ผ๋กœ ๋งŒ๋“  ์•„์ด์Šคํฌ๋ฆผ ๊ณ ๋ฅด๊ธฐ [ํ”„๋กœ๊ทธ๋ž˜๋จธ์Šค] MySQL - SELECT | ๊ณผ์ผ๋กœ ๋งŒ๋“  ์•„์ด์Šคํฌ๋ฆผ ๊ณ ๋ฅด๊ธฐ https://school.programmers.co.kr/learn/courses/30/lessons/133025 ํ”„๋กœ๊ทธ๋ž˜๋จธ์Šค ์ฝ”๋“œ ์ค‘์‹ฌ์˜ ๊ฐœ๋ฐœ์ž ์ฑ„์šฉ. ์Šคํƒ ๊ธฐ๋ฐ˜์˜ ํฌ์ง€์…˜ ๋งค์นญ. ํ”„๋กœ๊ทธ๋ž˜๋จธ์Šค์˜ ๊ฐœ๋ฐœ์ž ๋งž์ถคํ˜• ํ”„๋กœํ•„์„ ๋“ฑ๋กํ•˜๊ณ , ๋‚˜์™€ ๊ธฐ์ˆ  ๊ถํ•ฉ์ด ์ž˜ ๋งž๋Š” ๊ธฐ์—…๋“ค์„ ๋งค์นญ ๋ฐ›์œผ์„ธ์š”. programmers.co.kr -- ์ฝ”๋“œ๋ฅผ ์ž…๋ ฅํ•˜์„ธ์š” SELECT A.FLAVOR FROM FIRST_HALF A JOIN (SELECT * FROM ICECREAM_INFO) B ON A.FLAVOR = B.FLAVOR WHERE A.TOTAL_ORDER >= 3000 AND B.INGREDIENT_TYPE = 'fruit_based' ORDER .. 2022. 11. 5.
[ํ”„๋กœ๊ทธ๋ž˜๋จธ์Šค] MySQL - SELECT | 12์„ธ ์ดํ•˜์ธ ์—ฌ์ž ํ™˜์ž ๋ชฉ๋ก ์ถœ๋ ฅํ•˜๊ธฐ [ํ”„๋กœ๊ทธ๋ž˜๋จธ์Šค] MySQL - SELECT | 12์„ธ ์ดํ•˜์ธ ์—ฌ์ž ํ™˜์ž ๋ชฉ๋ก ์ถœ๋ ฅํ•˜๊ธฐ https://school.programmers.co.kr/learn/courses/30/lessons/132201 ํ”„๋กœ๊ทธ๋ž˜๋จธ์Šค ์ฝ”๋“œ ์ค‘์‹ฌ์˜ ๊ฐœ๋ฐœ์ž ์ฑ„์šฉ. ์Šคํƒ ๊ธฐ๋ฐ˜์˜ ํฌ์ง€์…˜ ๋งค์นญ. ํ”„๋กœ๊ทธ๋ž˜๋จธ์Šค์˜ ๊ฐœ๋ฐœ์ž ๋งž์ถคํ˜• ํ”„๋กœํ•„์„ ๋“ฑ๋กํ•˜๊ณ , ๋‚˜์™€ ๊ธฐ์ˆ  ๊ถํ•ฉ์ด ์ž˜ ๋งž๋Š” ๊ธฐ์—…๋“ค์„ ๋งค์นญ ๋ฐ›์œผ์„ธ์š”. programmers.co.kr -- ์ฝ”๋“œ๋ฅผ ์ž…๋ ฅํ•˜์„ธ์š” -- NVL(ISNULL,ISFULL) -- SELECT IFNULL(Column๋ช…, "Null์ผ ๊ฒฝ์šฐ ๋Œ€์ฒด ๊ฐ’") FROM ํ…Œ์ด๋ธ”๋ช…; SELECT PT_NAME, PT_NO, GEND_CD, AGE, IFNULL(TLNO,'NONE') AS TLNO FROM PATIENT WHERE AGE 2022. 11. 4.
[ํ”„๋กœ๊ทธ๋ž˜๋จธ์Šค] MySQL - SELECT | ํ‰๋ถ€์™ธ๊ณผ ๋˜๋Š” ์ผ๋ฐ˜์™ธ๊ณผ ์˜์‚ฌ ๋ชฉ๋ก ์ถœ๋ ฅํ•˜๊ธฐ [ํ”„๋กœ๊ทธ๋ž˜๋จธ์Šค]MySQL - SELECT | ํ‰๋ถ€์™ธ๊ณผ ๋˜๋Š” ์ผ๋ฐ˜์™ธ๊ณผ ์˜์‚ฌ ๋ชฉ๋ก ์ถœ๋ ฅํ•˜๊ธฐ https://school.programmers.co.kr/learn/courses/30/lessons/132203 ํ”„๋กœ๊ทธ๋ž˜๋จธ์Šค ์ฝ”๋“œ ์ค‘์‹ฌ์˜ ๊ฐœ๋ฐœ์ž ์ฑ„์šฉ. ์Šคํƒ ๊ธฐ๋ฐ˜์˜ ํฌ์ง€์…˜ ๋งค์นญ. ํ”„๋กœ๊ทธ๋ž˜๋จธ์Šค์˜ ๊ฐœ๋ฐœ์ž ๋งž์ถคํ˜• ํ”„๋กœํ•„์„ ๋“ฑ๋กํ•˜๊ณ , ๋‚˜์™€ ๊ธฐ์ˆ  ๊ถํ•ฉ์ด ์ž˜ ๋งž๋Š” ๊ธฐ์—…๋“ค์„ ๋งค์นญ ๋ฐ›์œผ์„ธ์š”. programmers.co.kr -- ์ฝ”๋“œ๋ฅผ ์ž…๋ ฅํ•˜์„ธ์š” --DATE_FORMAT()์„ ์ด์šฉํ•ด FORMATING ๊ฐ€๋Šฅ SELECT DR_NAME, DR_ID, MCDP_CD,DATE_FORMAT(HIRE_YMD,'%Y-%m-%d') AS HIRE_YMD FROM DOCTOR WHERE MCDP_CD = 'GS' OR MCDP_CD = 'CS'.. 2022. 11. 3.
[ํ”„๋กœ๊ทธ๋ž˜๋จธ์Šค] MYSQL - String, Date [ํ”„๋กœ๊ทธ๋ž˜๋จธ์Šค] MYSQL - String, Date 1. ๋ฃจ์‹œ์™€ ์—˜๋ผ ์ฐพ๊ธฐ https://school.programmers.co.kr/learn/courses/30/lessons/59046 ํ”„๋กœ๊ทธ๋ž˜๋จธ์Šค ์ฝ”๋“œ ์ค‘์‹ฌ์˜ ๊ฐœ๋ฐœ์ž ์ฑ„์šฉ. ์Šคํƒ ๊ธฐ๋ฐ˜์˜ ํฌ์ง€์…˜ ๋งค์นญ. ํ”„๋กœ๊ทธ๋ž˜๋จธ์Šค์˜ ๊ฐœ๋ฐœ์ž ๋งž์ถคํ˜• ํ”„๋กœํ•„์„ ๋“ฑ๋กํ•˜๊ณ , ๋‚˜์™€ ๊ธฐ์ˆ  ๊ถํ•ฉ์ด ์ž˜ ๋งž๋Š” ๊ธฐ์—…๋“ค์„ ๋งค์นญ ๋ฐ›์œผ์„ธ์š”. programmers.co.kr -- ์ฝ”๋“œ๋ฅผ ์ž…๋ ฅํ•˜์„ธ์š” SELECT ANIMAL_ID, NAME, SEX_UPON_INTAKE FROM ANIMAL_INS WHERE NAME IN ('Lucy','Ella','Pickle','Rogan','Sabrina','Mitty'); 2. ์ด๋ฆ„์— el์ด ๋“ค์–ด๊ฐ€๋Š” ๋™๋ฌผ ์ฐพ๊ธฐ https://school.programm.. 2022. 7. 25.
[ํ”„๋กœ๊ทธ๋ž˜๋จธ์Šค] MYSQL - JOIN [ํ”„๋กœ๊ทธ๋ž˜๋จธ์Šค] MYSQL - JOIN 1. ์—†์–ด์ง„ ๊ธฐ๋ก ์ฐพ๊ธฐ https://school.programmers.co.kr/learn/courses/30/lessons/59042 ํ”„๋กœ๊ทธ๋ž˜๋จธ์Šค ์ฝ”๋“œ ์ค‘์‹ฌ์˜ ๊ฐœ๋ฐœ์ž ์ฑ„์šฉ. ์Šคํƒ ๊ธฐ๋ฐ˜์˜ ํฌ์ง€์…˜ ๋งค์นญ. ํ”„๋กœ๊ทธ๋ž˜๋จธ์Šค์˜ ๊ฐœ๋ฐœ์ž ๋งž์ถคํ˜• ํ”„๋กœํ•„์„ ๋“ฑ๋กํ•˜๊ณ , ๋‚˜์™€ ๊ธฐ์ˆ  ๊ถํ•ฉ์ด ์ž˜ ๋งž๋Š” ๊ธฐ์—…๋“ค์„ ๋งค์นญ ๋ฐ›์œผ์„ธ์š”. programmers.co.kr SELECT A.ANIMAL_ID,A.NAME FROM ANIMAL_OUTS A LEFT JOIN ANIMAL_INS B ON A.ANIMAL_ID = B.ANIMAL_ID WHERE B.ANIMAL_ID IS NULL ORDER BY ANIMAL_ID 2. ์žˆ์—ˆ๋Š”๋ฐ์š” ์—†์—ˆ์Šต๋‹ˆ๋‹ค https://school.programmers.co.k.. 2022. 7. 23.
[ํ”„๋กœ๊ทธ๋ž˜๋จธ์Šค] MYSQL. IS NULL 1. ์ด๋ฆ„์ด ์—†๋Š” ๋™๋ฌผ์˜ ์•„์ด๋”” https://programmers.co.kr/learn/courses/30/lessons/59039 ์ฝ”๋”ฉํ…Œ์ŠคํŠธ ์—ฐ์Šต - ์ด๋ฆ„์ด ์—†๋Š” ๋™๋ฌผ์˜ ์•„์ด๋”” ANIMAL_INS ํ…Œ์ด๋ธ”์€ ๋™๋ฌผ ๋ณดํ˜ธ์†Œ์— ๋“ค์–ด์˜จ ๋™๋ฌผ์˜ ์ •๋ณด๋ฅผ ๋‹ด์€ ํ…Œ์ด๋ธ”์ž…๋‹ˆ๋‹ค. ANIMAL_INS ํ…Œ์ด๋ธ” ๊ตฌ์กฐ๋Š” ๋‹ค์Œ๊ณผ ๊ฐ™์œผ๋ฉฐ, ANIMAL_ID, ANIMAL_TYPE, DATETIME, INTAKE_CONDITION, NAME, SEX_UPON_INTAKE๋Š” ๊ฐ๊ฐ ๋™๋ฌผ์˜ ์•„์ด๋”” programmers.co.kr SELECT ANIMAL_ID FROM ANIMAL_INS WHERE NAME IS NULL; 2. ์ด๋ฆ„์ด ์žˆ๋Š” ๋™๋ฌผ์˜ ์•„์ด๋”” https://programmers.co.kr/learn/courses/30/less.. 2022. 4. 14.
[ํ”„๋กœ๊ทธ๋ž˜๋จธ์Šค] MYSQL.GROUP BY 1. ๊ณ ์–‘์ด์™€ ๊ฐœ๋Š” ๋ช‡ ๋งˆ๋ฆฌ ์žˆ์„๊นŒ? https://programmers.co.kr/learn/courses/30/lessons/59040 ์ฝ”๋”ฉํ…Œ์ŠคํŠธ ์—ฐ์Šต - ๊ณ ์–‘์ด์™€ ๊ฐœ๋Š” ๋ช‡ ๋งˆ๋ฆฌ ์žˆ์„๊นŒ ANIMAL_INS ํ…Œ์ด๋ธ”์€ ๋™๋ฌผ ๋ณดํ˜ธ์†Œ์— ๋“ค์–ด์˜จ ๋™๋ฌผ์˜ ์ •๋ณด๋ฅผ ๋‹ด์€ ํ…Œ์ด๋ธ”์ž…๋‹ˆ๋‹ค. ANIMAL_INS ํ…Œ์ด๋ธ” ๊ตฌ์กฐ๋Š” ๋‹ค์Œ๊ณผ ๊ฐ™์œผ๋ฉฐ, ANIMAL_ID, ANIMAL_TYPE, DATETIME, INTAKE_CONDITION, NAME, SEX_UPON_INTAKE๋Š” ๊ฐ๊ฐ ๋™๋ฌผ์˜ ์•„์ด๋”” programmers.co.kr SELECT ANIMAL_TYPE, COUNT(ANIMAL_TYPE) FROM ANIMAL_INS GROUP BY ANIMAL_TYPE ORDER BY ANIMAL_TYPE; 2. ๋™๋ช… ๋™๋ฌผ ์ˆ˜ ์ฐพ๊ธฐ h.. 2022. 4. 14.
[ํ”„๋กœ๊ทธ๋ž˜๋จธ์Šค] MYSQL.SUM, MAX, MIN 1. ์ตœ๋Œ€๊ฐ’ ๊ตฌํ•˜๊ธฐ https://programmers.co.kr/learn/courses/30/lessons/59415 ์ฝ”๋”ฉํ…Œ์ŠคํŠธ ์—ฐ์Šต - ์ตœ๋Œ“๊ฐ’ ๊ตฌํ•˜๊ธฐ ANIMAL_INS ํ…Œ์ด๋ธ”์€ ๋™๋ฌผ ๋ณดํ˜ธ์†Œ์— ๋“ค์–ด์˜จ ๋™๋ฌผ์˜ ์ •๋ณด๋ฅผ ๋‹ด์€ ํ…Œ์ด๋ธ”์ž…๋‹ˆ๋‹ค. ANIMAL_INS ํ…Œ์ด๋ธ” ๊ตฌ์กฐ๋Š” ๋‹ค์Œ๊ณผ ๊ฐ™์œผ๋ฉฐ, ANIMAL_ID, ANIMAL_TYPE, DATETIME, INTAKE_CONDITION, NAME, SEX_UPON_INTAKE๋Š” ๊ฐ๊ฐ ๋™๋ฌผ์˜ ์•„์ด๋”” programmers.co.kr SELECT MAX(DATETIME) AS '์‹œ๊ฐ„' FROM ANIMAL_INS 2. ์ตœ์†Ÿ๊ฐ’ ๊ตฌํ•˜๊ธฐ https://programmers.co.kr/learn/courses/30/lessons/59038 ์ฝ”๋”ฉํ…Œ์ŠคํŠธ ์—ฐ์Šต - ์ตœ์†Ÿ๊ฐ’ ๊ตฌํ•˜๊ธฐ .. 2022. 4. 14.
[ํ”„๋กœ๊ทธ๋ž˜๋จธ์Šค] MYSQL.SELECT 1. ๋ชจ๋“  ๋ ˆ์ฝ”๋“œ ์กฐํšŒํ•˜๊ธฐ https://programmers.co.kr/learn/courses/30/lessons/59034 ์ฝ”๋”ฉํ…Œ์ŠคํŠธ ์—ฐ์Šต - ๋ชจ๋“  ๋ ˆ์ฝ”๋“œ ์กฐํšŒํ•˜๊ธฐ ANIMAL_INS ํ…Œ์ด๋ธ”์€ ๋™๋ฌผ ๋ณดํ˜ธ์†Œ์— ๋“ค์–ด์˜จ ๋™๋ฌผ์˜ ์ •๋ณด๋ฅผ ๋‹ด์€ ํ…Œ์ด๋ธ”์ž…๋‹ˆ๋‹ค. ANIMAL_INS ํ…Œ์ด๋ธ” ๊ตฌ์กฐ๋Š” ๋‹ค์Œ๊ณผ ๊ฐ™์œผ๋ฉฐ, ANIMAL_ID, ANIMAL_TYPE, DATETIME, INTAKE_CONDITION, NAME, SEX_UPON_INTAKE๋Š” ๊ฐ๊ฐ ๋™๋ฌผ์˜ ์•„์ด๋”” programmers.co.kr SELECT ANIMAL_ID,ANIMAL_TYPE,DATETIME,INTAKE_CONDITION,NAME,SEX_UPON_INTAKE FROM ANIMAL_INS ORDER BY ANIMAL_ID; 2. ์—ญ์ˆœ ์ •๋ ฌํ•˜๊ธฐ h.. 2022. 4. 14.