August 2022
Beginner to intermediate
436 pages
9h 43m
Korean
Content preview from SQL로 시작하는 데이터 분석
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
Start your free trial
203
4
장
코호트 분석
SELECT
distinct
id_bioguide
,
min
(term_start)
over
(
partition
by
id_bioguide)
as
first_term
,
first_value
(state)
over
(
partition
by
id_bioguide
order
by
term_start)
as
first_state
FROM
legislators_terms
) a
JOIN
legislators b
on
a.id_bioguide = b.id_bioguide
WHERE
a.first_term
between
‘1917-01-01’
and
‘1999-12-31’
GROUP
BY
1,2
) aa
JOIN
(
SELECT
generate_series
as
period
FROM
generate_series(0,20,1)
) cc
on
1 = 1
) aaa
LEFT
JOIN
(
SELECT
d.first_state, g.gender
,
coalesce
(date_part(‘year’,age(f.date,d.first_term)),0)
as
period
,
count
(
distinct
d.id_bioguide)
as
cohort_retained
FROM
(
SELECT
distinct
id_bioguide
,
min
(term_start)
over
(
partition
by
id_bioguide)
as
first_term
,
first_value
(state)
over
(
partition ...