August 2022
Beginner to intermediate
436 pages
9h 43m
Korean
Content preview from SQL로 시작하는 데이터 분석
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104
SQL로 시작하는 데이터 분석
SELECT
date ‘2020-09-01’ +
time
‘03:00:00’
as
timestamp
;
timestamp
-------------------
2020-09-01 03:00:00
날짜 데이터를 생성하는 함수는
make
_
date
,
makedate
,
date
_
from
_
parts
,
datefromparts
등이 있습니다. 데이터베이스마다 이름이 조금씩 다르지만 기능은 동일합니다. 연, 월, 일 값을
인자로 넘기면 이에 해당하는 날짜 데이터를 반환합니다. 인자로 상수를 사용할 수도 있고 참
조할 필드 이름을 사용할 수도 있는데, 둘 중 무엇을 사용하든 값은 반드시 정수여야 합니다.
SELECT
make_date(2020,09,01);
make_date
----------
2020-09-01
또 다른 방법으로는, 다음 코드와 같이 값들을 이어 붙이고 그 결과를
DATE
타입으로 캐스팅하
거나
to
_
date
함수를 사용합니다.
SELECT
to_date
(
concat
(2020,’-’,09,’-’,01), ‘yyyy-mm-dd’);
to_date
----------
2020-09-01
SELECT
cast
(
concat
(2020,’-’,09,’-’,01)
as
date);
concat
----------
2020-09-01 ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.