[๊ฑท๊ธฐ๋ฐ˜] SQL ๋ฌธ๋ฒ• ์—ฐ์Šต 5
ยท
๋‚ด์ผ๋ฐฐ์›€์บ ํ”„/์‚ฌ์ „์บ ํ”„ ๊ณผ์ œ
5) ๊ณต๋ถ€ํ•˜๋‹ค๋ณด๋‹ˆ ํŒ€ ํ”„๋กœ์ ํŠธ ์‹œ๊ฐ„์ด ์™”์–ด์š”! - ํ”„๋กœ์ ํŠธ ํ…Œ์ด๋ธ” 17.team_projects ํ…Œ์ด๋ธ”์—์„œ AWS ์˜ˆ์‚ฐ(aws_cost)์ด 40000 ์ด์ƒ ๋“ค์–ด๊ฐ„ ํ”„๋กœ์ ํŠธ๋“ค์˜ ์ด๋ฆ„์„ ์„ ํƒํ•˜๋Š” ์ฟผ๋ฆฌ๋ฅผ ์ž‘์„ฑํ•ด์ฃผ์„ธ์š”!๋‚˜์˜ ๋‹ตSelect name From team_projects Where aws_cost>=40000;์ •๋‹ตSELECT name FROM team_projects WHERE aws_cost >= 40000;์˜ค๋‹ต ๋…ธํŠธ-๊ณ ๋ฏผํ•œ ์ -  18.team_projects ํ…Œ์ด๋ธ”์—์„œ 2022๋…„์— ์‹œ์ž‘๋œ ํ”„๋กœ์ ํŠธ๋ฅผ ์„ ํƒํ•˜๋Š” ์ฟผ๋ฆฌ๋ฅผ ์ž‘์„ฑํ•ด์ฃผ์„ธ์š”! ๋‹จ, start_date ๋‚˜์˜ ๋‹ตSelect * From team_projects Where year(start_date) = 2022;์ •๋‹ต SELECT id, name,..
[๊ฑท๊ธฐ๋ฐ˜] SQL ๋ฌธ๋ฒ• ์—ฐ์Šต 4
ยท
๋‚ด์ผ๋ฐฐ์›€์บ ํ”„/์‚ฌ์ „์บ ํ”„ ๊ณผ์ œ
4) ์ด์ œ ๋†€๋งŒํผ ๋†€์•˜์œผ๋‹ˆ ๋‹ค์‹œ ๊ณต๋ถ€ํ•ด๋ด…์‹œ๋‹ค! - ํ•™์ƒ ํ…Œ์ด๋ธ”[๋ฌธ์ œใ€€ใ€€๋‚ด๊ฐ€ ์“ด ๋‹ตใ€€ใ€€=>์บ ํ”„์—์„œ ์ œ๊ณตํ•œ ๋‹ต์•ˆใ€€ใ€€- ์˜ค๋‹ต๋…ธํŠธ ๋ฐ ์˜๋ฌธ์‚ฌํ•ญใ€€ใ€€* ์ •๋‹ต๊ณผ ๋™์ผํ•˜๋ฉด => / - ๋ฏธ์ž‘์„ฑ] 13. sparta_students ํ…Œ์ด๋ธ”์—์„œ ๋ชจ๋“  ํ•™์ƒ์˜ ์ด๋ฆ„(name)๊ณผ ํŠธ๋ž™(track)์„ ์„ ํƒํ•˜๋Š” ์ฟผ๋ฆฌ๋ฅผ ์ž‘์„ฑํ•ด์ฃผ์„ธ์š”! ใ€€ใ€€SELECT name, track FROM sparta_students;14. sparta_students ํ…Œ์ด๋ธ”์—์„œ Unity ํŠธ๋ž™ ์†Œ์†์ด ์•„๋‹Œ ํ•™์ƒ๋“ค์„ ์„ ํƒํ•˜๋Š” ์ฟผ๋ฆฌ๋ฅผ ์ž‘์„ฑํ•ด์ฃผ์„ธ์š”! ใ€€ใ€€SELECT id, name, track, grade, enrollment_year FROM sparta_students WHERE track'Unity';15. sparta_students ํ…Œ์ด๋ธ”์—์„œ ์ž…ํ•™๋…„๋„(e..
[๊ฑท๊ธฐ๋ฐ˜] SQL ๋ฌธ๋ฒ• ์—ฐ์Šต 3
ยท
๋‚ด์ผ๋ฐฐ์›€์บ ํ”„/์‚ฌ์ „์บ ํ”„ ๊ณผ์ œ
3) ์ƒํ’ˆ ์ฃผ๋ฌธ์ด ๋“ค์–ด์™”์œผ๋‹ˆ ์ฃผ๋ฌธ์„ ์ฒ˜๋ฆฌํ•ด๋ด…์‹œ๋‹ค![๋ฌธ์ œใ€€ใ€€๋‚ด๊ฐ€ ์“ด ๋‹ตใ€€ใ€€์บ ํ”„์—์„œ ์ œ๊ณตํ•œ ๋‹ต์•ˆใ€€ใ€€- ์˜ค๋‹ต๋…ธํŠธ ๋ฐ ์˜๋ฌธ์‚ฌํ•ญ] 9. orders ํ…Œ์ด๋ธ”์—์„œ ์ฃผ๋ฌธ ์ˆ˜๋Ÿ‰(amount)์ด 2๊ฐœ ์ด์ƒ์ธ ์ฃผ๋ฌธ์„ ์ง„ํ–‰ํ•œ ์†Œ๋น„์ž์˜ ID(customer_id)๋งŒ ์„ ํƒํ•˜๋Š” ์ฟผ๋ฆฌ๋ฅผ ์ž‘์„ฑํ•ด์ฃผ์„ธ์š”!ใ€€ใ€€SELECT id FROM orders WHERE amount>=2; ใ€€ใ€€=> SELECT customer_id FROM orders WHERE amount > 1;ใ€€ใ€€- '>=' ๋˜๋Š” 'ใ€€ใ€€-  ๊ทผ๋ฐ ์™œ ๋ฌธ์ œ๋Š” 2๊ฐœ  ์ด์ƒ์ธ๋ฐ ์ •๋‹ต์€ >1๋กœ ํ‘œํ˜„ํ–ˆ์„๊นŒ? ์–ด์ฐจํ”ผ ์ˆ˜๋Ÿ‰์ด๋‹ˆ๊นŒ ๋ชจ๋‘ ์ •์ˆ˜๋ผ์„œ? ๊ทธ๋ž˜๋„ 2 ์ด์ƒ์ธ๋ฐ 1์ดˆ๊ณผ๋กœ ํ‘œํ˜„ํ•œ ์ด์œ ๊ฐ€ ๋”ฐ๋กœ ์žˆ๋Š”์ง€ ๊ถ๊ธˆํ•˜๋‹ค.ใ€€ใ€€- customer_id์™€ id ๋‘๊ฐœ์ด ์†์„ฑ์ด ์žˆ์—ˆ๋‹ค.. ์ž˜ ๊ตฌ๋ถ„ํ•ด์„œ ์ž‘์„ฑํ•˜๊ธฐใ€€..
[๊ฑท๊ธฐ๋ฐ˜] SQL ๋ฌธ๋ฒ• ์—ฐ์Šต 2
ยท
๋‚ด์ผ๋ฐฐ์›€์บ ํ”„/์‚ฌ์ „์บ ํ”„ ๊ณผ์ œ
2) ์ด์ œ ์ข€ ๋ฒŒ์—ˆ์œผ๋‹ˆ flexํ•œ ๋ฒˆ ํ•ด๋ณผ๊นŒ์š”?! 5. products ํ…Œ์ด๋ธ”์—์„œ ์ œํ’ˆ ์ด๋ฆ„(product_name)๊ณผ ๊ฐ€๊ฒฉ(price)๋งŒ์„ ์„ ํƒํ•˜๋Š” ์ฟผ๋ฆฌ๋ฅผ ์ž‘์„ฑํ•ด์ฃผ์„ธ์š”.ใ€€ ใ€€SELECT product_name, price FROM products;6.products ํ…Œ์ด๋ธ”์—์„œ ์ œํ’ˆ ์ด๋ฆ„์— 'ํ”„๋กœ'๊ฐ€ ํฌํ•จ๋œ ๋ชจ๋“  ์ œํ’ˆ์„ ์„ ํƒํ•˜๋Š” ์ฟผ๋ฆฌ๋ฅผ ์ž‘์„ฑํ•ด์ฃผ์„ธ์š”.ใ€€ ใ€€ SELECT  id, product_name, price, category FROM products WHERE product_name LIKE '%ํ”„๋กœ%';7. products ํ…Œ์ด๋ธ”์—์„œ ์ œํ’ˆ ์ด๋ฆ„์ด '๊ฐค'๋กœ ์‹œ์ž‘ํ•˜๋Š” ๋ชจ๋“  ์ œํ’ˆ์„ ์„ ํƒํ•˜๋Š” ์ฟผ๋ฆฌ๋ฅผ ์ž‘์„ฑํ•ด์ฃผ์„ธ์š”.ใ€€ ใ€€ SELECT  id, product_name, price, category FROM pr..
[๊ฑท๊ธฐ๋ฐ˜] SQL ๋ฌธ๋ฒ• ์—ฐ์Šต 1
ยท
๋‚ด์ผ๋ฐฐ์›€์บ ํ”„/์‚ฌ์ „์บ ํ”„ ๊ณผ์ œ
1) ๋ˆ์„ ๋ฒŒ๊ธฐ ์œ„ํ•ด ์ผ์„ ํ•ฉ์‹œ๋‹ค! 1. sparta_employees ํ…Œ์ด๋ธ”์—์„œ ๋ชจ๋“  ์ง์›์˜ ์ด๋ฆ„(name)๊ณผ ์ง๊ธ‰(position)์„ ์„ ํƒํ•˜๋Š” ์ฟผ๋ฆฌ๋ฅผ ์ž‘์„ฑํ•ด์ฃผ์„ธ์š”.ใ€€ใ€€SELECT name, position From sparta_employees;2. sparta_employees ํ…Œ์ด๋ธ”์—์„œ ์ค‘๋ณต ์—†์ด ๋ชจ๋“  ์ง๊ธ‰(position)์„ ์„ ํƒํ•˜๋Š” ์ฟผ๋ฆฌ๋ฅผ ์ž‘์„ฑํ•ด์ฃผ์„ธ์š”.ใ€€ใ€€SELECT DISTINCT position From sparta_employees;3. sparta_employees ํ…Œ์ด๋ธ”์—์„œ ์—ฐ๋ด‰(salary)์ด 40000๊ณผ 60000 ์‚ฌ์ด์ธ ์ง์›๋“ค์„ ์„ ํƒํ•˜๋Š” ์ฟผ๋ฆฌ๋ฅผ ์ž‘์„ฑํ•ด์ฃผ์„ธ์š”.ใ€€ใ€€SELECT salary From sparta_employees Where salary > 40000 AND salary..