PostgreSQL - 错误：列不存在 SQL 状态：42703
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PostgreSQL - ERROR: column does not exist SQL state: 42703
提问by DBE7
I am trying to do a cohort analysis and compare average number of rentals based on the renter's first rental year(= the year where a renter rented first time). Basically, I am asking the question: are we retaining renters whose first year renting was 2013 than renters whose first year was 2015?
我正在尝试进行群组分析，并根据承租人的第一个租赁年度（= 承租人第一次租赁的年份）比较平均租金数量。基本上，我在问一个问题：我们是否保留了第一年租房是 2013 年的租房者，而不是第一年是 2015 年的租房者？
Here is my code:
这是我的代码：
SELECT renter_id,
Min(Date_part('year', created_at)) AS first_rental_year,
( Count(trip_finish) ) AS number_of_trips
FROM bookings
WHERE state IN ( 'approved', 'aboard', 'ashore', 'concluded', 'disputed' )
AND first_rental_year = 2013
GROUP BY 1
ORDER BY 1;
The error message I get is:
我得到的错误信息是：
ERROR: column "first_rental_year" does not exist
LINE 6: ... 'aboard', 'ashore', 'concluded', 'disputed') AND first_rent...
^
********** Error **********
ERROR: column "first_rental_year" does not exist
SQL state: 42703
Character: 208
Any help is much appreciated.
任何帮助深表感谢。
回答by Juan Carlos Oropeza
SELECT renter_id,
Count(trip_finish) AS number_of_trips
FROM (
SELECT renter_id,
trip_finish,
Min(Date_part('year', created_at)) AS first_rental_year
FROM bookings
WHERE state IN ( 'approved', 'aboard', 'ashore', 'concluded', 'disputed' )
) T
WHERE first_rental_year = 2013
GROUP BY renter_id
ORDER BY renter_id ;
