SQL Where

💡 Where

레코드를 필터링 하는데 사용, 지정된 조건을 충족하는 레코드만 추출하는데 사용한다.

SELECT column1, column2
FROM table_name
WHERE condition;

Sample Table

CustomerID	CustomerName	ContactName	Address	City	PostalCode	Country
1	Alfreds Futterkiste	Maria Anders	Obere Str. 57	Berlin	12209	Germany
2	Ana Trujillo Emparedados y helados	Ana Trujillo	Avda. de la Constitución 2222	México D.F.	05021	Mexico
3	Antonio Moreno Taquería	Antonio Moreno	Mataderos 2312	México D.F.	05023	Mexico
4	Around the Horn	Thomas Hardy	120 Hanover Sq.	London	WA1 1DP	UK
5	Berglunds snabbköp	Christina Berglund	Berguvsvägen 8	Luleå	S-958 22	Sweden

예시

국가가 Mexico인 모든 레코드 선택

SELECT *
FROM Customers
WHERE Country='Mexico';

국가가 Berlin이 아닌 모든 레코드 선택

SELECT *
FROM Customers
WHERE NOT City='Berlin'

CustomerID가 32인 레코드 선택

SELECT *
FROM Customers
WHERE CustomerID = 32;

City가 Berlin이고 PostalCode가 12209인 모든 레코드 선택

SELECT *
FROM Customers
WHERE City = 'Berlin'
AND PostalCode = 12209;

City가 Berlin 이거나 London인 모든 레코드 선택

SELECT *
FROM Customers
WHERE City = 'Berlin'
OR City = 'London';

Where의 연산자

Operator	Description	Example
=	Equal	Try it
>	Greater than	Try it
<	Less than	Try it
>=	Greater than or equal	Try it
<=	Less than or equal	Try it
<>	Not equal. Note: In some versions of SQL this operator may be written as !=	Try it
BETWEEN	Between a certain range	Try it
LIKE	Search for a pattern	Try it
IN	To specify multiple possible values for a column	Try it