August 2022
Beginner to intermediate
436 pages
9h 43m
Korean
Content preview from SQL로 시작하는 데이터 분석
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269
5
장
텍스트 분석
IN
,
NOT
IN
연산자를 사용하면 코드가 간결하고 가독성이 좋아집니다. 이 장점은 특히 여러
조건에 따라 데이터의 카테고리를 나누는 복잡한 쿼리를 작성할 때 빛을 발합니다. 예를 들어,
첫 단어의 색상, 모양, 움직임 등 다양한 조건에 따라 레코드를 분류하고 조건별 레코드 수를
파악하는 쿼리를 가정해봅시다. 다음과 같이
IN
연산자와 텍스트 파싱, 텍스트 변환, 패턴 매
칭을 조합하면 코드가 더 간결해지고 가독성도 좋아집니다.
SELECT
case
when
lower
(first_word)
in
(‘red’,’orange’,’yellow’,’green’,
‘blue’,’purple’,’white’)
then
‘Color’
when
lower
(first_word)
in
(‘round’,’circular’,’oval’,’cigar’)
then
‘Shape’
when
first_word
ilike
‘triang%’
then
‘Shape’
when
first_word
ilike
‘flash%’
then
‘Motion’
when
first_word
ilike
‘hover%’
then
‘Motion’
when
first_word
ilike
‘pulsat%’
then
‘Motion’
else
‘Other’
end
as
first_word_type ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
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.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
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.