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๐Ÿ’ SQL 77

[ํ”„๋กœ๊ทธ๋ž˜๋จธ์Šค][SQL] ์กฐ๊ฑด์— ๋งž๋Š” ์‚ฌ์šฉ์ž ์ •๋ณด ์กฐํšŒํ•˜๊ธฐ

https://school.programmers.co.kr/learn/courses/30/lessons/164670 ํ”„๋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 ๋ฌธ์ œ 1. USED_GOODS_BOARD์™€ USED_GOODS_USER ํ…Œ์ด๋ธ”์—์„œ 2. ์ค‘๊ณ  ๊ฑฐ๋ž˜ ๊ฒŒ์‹œ๋ฌผ์„ 3๊ฑด ์ด์ƒ ๋“ฑ๋กํ•œ ์‚ฌ์šฉ์ž์˜ 3. ์‚ฌ์šฉ์ž ID, ๋‹‰๋„ค์ž„, ์ „์ฒด์ฃผ์†Œ, ์ „ํ™”๋ฒˆํ˜ธ๋ฅผ ์กฐํšŒํ•˜๋Š” SQL๋ฌธ์„ ์ž‘์„ฑํ•ด์ฃผ์„ธ์š”. 4. ์ด๋•Œ, ์ „์ฒด ์ฃผ์†Œ๋Š” ์‹œ, ๋„๋กœ๋ช… ์ฃผ์†Œ, ์ƒ์„ธ ์ฃผ์†Œ๊ฐ€ ํ•จ๊ป˜ ์ถœ๋ ฅ๋˜๋„๋ก ํ•ด์ฃผ์‹œ๊ณ , 5. ์ „ํ™”๋ฒˆํ˜ธ์˜ ๊ฒฝ์šฐ xxx-xxxx-xxxx ๊ฐ™์€ ํ˜•ํƒœ๋กœ ํ•˜์ดํ”ˆ ๋ฌธ์ž์—ด(-)์„ ์‚ฝ์ž…ํ•˜์—ฌ ์ถœ๋ ฅํ•ด..

[ํ”„๋กœ๊ทธ๋ž˜๋จธ์Šค][SQL] ๋Œ€์—ฌ ๊ธฐ๋ก์ด ์กด์žฌํ•˜๋Š” ์ž๋™์ฐจ ๋ฆฌ์ŠคํŠธ ๊ตฌํ•˜๊ธฐ

https://school.programmers.co.kr/learn/courses/30/lessons/157341 ํ”„๋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 CAR_RENTAL_COMPANY_CAR ํ…Œ์ด๋ธ”๊ณผ CAR_RENTAL_COMPANY_RENTAL_HISTORY ํ…Œ์ด๋ธ”์—์„œ ์ž๋™์ฐจ ์ข…๋ฅ˜๊ฐ€ '์„ธ๋‹จ'์ธ ์ž๋™์ฐจ๋“ค ์ค‘ 10์›”์— ๋Œ€์—ฌ๋ฅผ ์‹œ์ž‘ํ•œ ๊ธฐ๋ก์ด ์žˆ๋Š” ์ž๋™์ฐจ ID ๋ฆฌ์ŠคํŠธ๋ฅผ ์ถœ๋ ฅํ•˜๋Š” SQL๋ฌธ์„ ์ž‘์„ฑํ•ด์ฃผ์„ธ์š”. ์ž๋™์ฐจ ID ๋ฆฌ์ŠคํŠธ๋Š” ์ค‘๋ณต์ด ์—†์–ด์•ผ ํ•˜๋ฉฐ, ์ž๋™์ฐจ ID๋ฅผ ๊ธฐ์ค€์œผ๋กœ ๋‚ด๋ฆผ์ฐจ์ˆœ ์ •๋ ฌํ•ด์ฃผ์„ธ์š”. -- ์ฝ”๋“œ๋ฅผ ์ž…๋ ฅํ•˜์„ธ์š” SELECT distinct(c.C..

[ํ”„๋กœ๊ทธ๋ž˜๋จธ์Šค][SQL] ์ฆ๊ฒจ์ฐพ๊ธฐ๊ฐ€ ๊ฐ€์žฅ ๋งŽ์€ ์‹๋‹น ์ •๋ณด ์ถœ๋ ฅํ•˜๊ธฐ

https://school.programmers.co.kr/learn/courses/30/lessons/131123 ํ”„๋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 ์ฒ˜์Œ์—๋Š” ๋ณ„ ์ƒ๊ฐ์—†์ด ์•„์ฃผ ์‰ฝ๊ฒŒ ์ฟผ๋ฆฌ๋ฅผ ์งฐ๋Š”๋ฐ SELECT FOOD_TYPE, REST_ID, REST_NAME, max(FAVORITES) as FAVORITES from REST_INFO group by FOOD_TYPE ํ‹€๋ ธ๋‹ค. ์•Œ๊ณ ๋ณด๋‹ˆ ์ด๋ ‡๊ฒŒ ํ•˜๋ฉด FOOD_TYPE ์ข…๋ฅ˜๋ณ„๋กœ ๊ฐ€์žฅ FAVORITES๊ฐ€ ํฐ FOOD_TYPE๊ณผ FAVORITES ๊ฐ’์€ ๋ฐ˜ํ™˜ํ•ด์ฃผ์ง€๋งŒ ๊ทธ์— ํ•ด๋‹นํ•˜๋Š” REST_ID๋‚˜ ..

[ํ”„๋กœ๊ทธ๋ž˜๋จธ์Šค][SQL] ์—†์–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 -- ์ฝ”๋“œ๋ฅผ ์ž…๋ ฅํ•˜์„ธ์š” SELECT ANIMAL_ID, NAME from ANIMAL_OUTS where ANIMAL_ID not in (select ANIMAL_ID from ANIMAL_INS) order by ANIMAL_ID

๐Ÿ’ SQL/Join 2023.05.19

[ํ”„๋กœ๊ทธ๋ž˜๋จธ์Šค][SQL] ์กฐ๊ฑด์— ๋งž๋Š” ์‚ฌ์šฉ์ž์™€ ์ด ๊ฑฐ๋ž˜๊ธˆ์•ก ์กฐํšŒํ•˜๊ธฐ

https://school.programmers.co.kr/learn/courses/30/lessons/164668 ํ”„๋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 USER_ID, NICKNAME, sum(PRICE) as TOTAL_SALES from USED_GOODS_BOARD b join USED_GOODS_USER u on b.WRITER_ID = u.USER_ID where STATUS = 'DONE' group by USER_ID having TOTAL_SALES >= 700000 order by TOTAL_..

[ํ”„๋กœ๊ทธ๋ž˜๋จธ์Šค][SQL] ์กฐ๊ฑด๋ณ„๋กœ ๋ถ„๋ฅ˜ํ•˜์—ฌ ์ฃผ๋ฌธ์ƒํƒœ ์ถœ๋ ฅํ•˜๊ธฐ

https://school.programmers.co.kr/learn/courses/30/lessons/131113 ํ”„๋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 ORDER_ID, PRODUCT_ID, date_format(OUT_DATE, "%Y-%m-%d") as OUT_DATE, case when OUT_DATE is null then '์ถœ๊ณ ๋ฏธ์ •' when OUT_DATE '2022-05-01' then '์ถœ๊ณ ๋Œ€๊ธฐ' end as ์ถœ๊ณ ์—ฌ๋ถ€ from FOOD_ORDER order by ORDER_ID

[ํ”„๋กœ๊ทธ๋ž˜๋จธ์Šค] SQL ๊ณ ๋“์  Kit: ์นดํ…Œ๊ณ ๋ฆฌ ๋ณ„ ๋„์„œ ํŒ๋งค๋Ÿ‰ ์ง‘๊ณ„ํ•˜๊ธฐ

https://school.programmers.co.kr/learn/courses/30/lessons/144855 ํ”„๋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 CATEGORY, sum(SALES) as TOTAL_SALES from BOOK b join BOOK_SALES s on b.BOOK_ID = s.BOOK_ID where year(SALES_DATE) = 2022 and month(SALES_DATE) = 01 group by CATEGORY order by CATEGORY

[ํ”„๋กœ๊ทธ๋ž˜๋จธ์Šค] SQL ๊ณ ๋“์  Kit: ์˜ค๋žœ ๊ธฐ๊ฐ„ ๋ณดํ˜ธํ•œ ๋™๋ฌผ(2)

https://school.programmers.co.kr/learn/courses/30/lessons/59411 ํ”„๋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 I.ANIMAL_ID, I.NAME from ANIMAL_INS I join ANIMAL_OUTS O on I.ANIMAL_ID = O.ANIMAL_ID order by datediff(O.DATETIME, I.DATETIME) desc limit 2

[ํ”„๋กœ๊ทธ๋ž˜๋จธ์Šค] SQL ๊ณ ๋“์  Kit: ์žˆ์—ˆ๋Š”๋ฐ์š” ์—†์—ˆ์Šต๋‹ˆ๋‹ค

https://school.programmers.co.kr/learn/courses/30/lessons/59043 ํ”„๋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 I.ANIMAL_ID, I.NAME from ANIMAL_INS I join ANIMAL_OUTS O on I.ANIMAL_ID = O.ANIMAL_ID where I.DATETIME > O.DATETIME order by I.DATETIME asc

๐Ÿ’ SQL/Join 2023.05.11

[ํ”„๋กœ๊ทธ๋ž˜๋จธ์Šค] SQL ๊ณ ๋“์  Kit : ์˜ค๋žœ ๊ธฐ๊ฐ„ ๋ณดํ˜ธํ•œ ๋™๋ฌผ(1)

https://school.programmers.co.kr/learn/courses/30/lessons/59044 ํ”„๋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 NAME, DATETIME from ANIMAL_INS where ANIMAL_ID not in (select ANIMAL_ID from ANIMAL_OUTS) order by DATETIME asc limit 3

๐Ÿ’ SQL/Join 2023.05.10
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