if 문, case 문, ifnull문
IF 문
형식 : if ( 조건문, 참일때 값, 거짓일때 값)
EX) select member_id, if ( isnull(birthday), ‘-‘, birthday ) from member
설명 – 멤버 테이블에서 아이디(member_id) 와 생일을 뽑는데 null 일경우는 – 를 출력,
아니면 생일을 출력
Case 문
형식 : case (조건 또는 값)
when 값1 then 표시값
when 값2 then 표시값
else 표시값
end
EX) select case a when ‘1’ then a when ‘2’ then b else c end from table_name
설명 – a 값이 ‘1’이면 a, ‘2’ 이면 b, 둘다 아닐경우 c 를 출력
ifnull문 ( mysql 에서 사용 )
형식 : ifnull ( 값1, 값2)
EX ) select ifnull ( price, 0 ) from books
설명 – price 값이 Null 이면 0을, Null 이 아니면 price 값을 출력
isnull문 ( MS-SQL 에서 사용 )
형식 : ifnull ( 값1, 값2)
EX ) select isnull ( price, 0 ) from books
설명 – price 값이 Null 이면 0을, Null 이 아니면 price 값을 출력
NVL문 ( Oracle 에서 사용 )
형식 : NVL ( 값1, 값2)
EX ) select nvl ( price, 0 ) from books
설명 – price 값이 Null 이면 0을, Null 이 아니면 price 값을 출력
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