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๐ฒ์๋ผ๋๋์ฒญ๋
My SQL ๊ณต๋ถ 2(ORDER, INSERT, NULL) ๋ณธ๋ฌธ
ORDER
The ORDER BY keyword is used to sort the result-set in ascending or descending order.
๋๋ผ์ด๋ฆ ์์ผ๋ก Customer ํ ์ด๋ธ ์ ๋ ฌํ๊ธฐ
SELECT * FROM Customer ORDER BY country;
๋ด๋ฆผ์ฐจ์ ์์ผ๋ก Customer ํ ์ด๋ธ ์ ๋ ฌํ๊ธฐ
SELECT * FROM Customer ORDER BY Country DESC
country ์ด๋ฆ์ผ๋ก ์ ๋ ฌํ ๋ค ๋ค์ customer name ์ผ๋ก ์ ๋ ฌํ๊ธฐ
SELECT * FROM Customer ORDER BY Country, CustomerName
country ์ด๋ฆ์ผ๋ก ์ ๋ ฌํ ๋ค ๋ค์ customer name ์ ๋ด๋ฆผ์ฐจ์์ผ๋ก ์ ๋ ฌํ๊ธฐ
SELECT * FROM Customer ORDER BY Country ASC,CustomerName DESC
INSERT
The INSERT INTO statement is used to insert new records in a table.
๋๊ฐ์ง ๋ฐฉ๋ฒ์ด ์๋ค 1. table์ attribute๋ฅผ ์ง์ ํ์ฌ ๋ฃ๋ ๊ฒฝ์ฐ, 2. table์ attribute ๋ฅผ ์ง์ ํ์ง ์๊ณ ๋ฃ๋ ๊ฒฝ์ฐ( ์์๋๋ก Insert ํด์ผํจ)
1.table์ attribute ์ง์ ํ์ฌ ๋ฃ๊ธฐ(๋น ๊ณณ์๋ NULL ์ด ๋ค์ด๊ฐ๊ฒ ๋๋ค.)
Customer table์์ name, country, city ๋ฃ๊ธฐ
INSERT INTO Customers(CustomerName, City, Country) VALUES ('Amy', Berlin', 'German');
2. ์ง์ ํ์ง ์๊ณ ๋ฃ๊ธฐ
INSERT INTO Customers VALUES('Amy,'Berlin',Germany');
NULL
address ๊ฐ Null์ธ ์๋ tuple ์ฐพ๊ธฐ(WHERE { } IS NULL)
SELECT CustomerName, Address FROM Customers WHERE address IS NULL
address ๊ฐ Null ์ด ์๋ tuple ์ฐพ๊ธฐ(WHERE { } IS NOT NULL)
SELECT CustomerName, Address From Customers WHERE Address IS NOT NULL
'DataBase' ์นดํ ๊ณ ๋ฆฌ์ ๋ค๋ฅธ ๊ธ
MySQL ๊ณต๋ถ5(IN, BETWWEN) (0) | 2019.05.03 |
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MySQL ๊ณต๋ถ4(LIMIT, MIN, MAX, COUNT, AVG, SUM) (0) | 2019.05.03 |
My SQL ๊ณต๋ถ 3(UPDATE, DELETE) (0) | 2019.05.02 |
My SQL ๊ณต๋ถ1(SLEECT, FROM, WHERE) (0) | 2019.05.02 |