如何使用sql查询获取表中存在的所有行，其中年份是闰年

Question

CREATE TABLE Movie (
MovieID int PRIMARY KEY,
year int,
rank int);

INSERT INTO Movie (MovieID, year, rank, ...)
VALUES (1, 1888, 4)
VALUES (2, 1889, 4)
VALUES (3, 1890, 5)
VALUES (4, 1900, 3)
VALUES (5, 1905, 4)
VALUES (6, 1947, 2)
VALUES (7, 1976, 1)
VALUES (8, 2000, 4);

now i want to fetch all the row where year is a leap year?

Answer 1

Use this query. A leap year feb month has 29 days.

select * 
from Movie where DAY(EOMONTH(DATEADD(DAY,31,DATEADD(YEAR,@YEAR-1900,0)))) = 29

Answer 2

我正在使用 sqlite3

WHERE strftime('%d', year || '-03-01', '-1 day') = '29'

Answer 3

Boring arithmetic:

MySQL:

SELECT *
WHERE MOD(`year`,4) = 0 AND MOD(`year`, 100) != 0 OR MOD(`year`, 400) = 0

SQLite (standard modulo operator):

SELECT *
WHERE year % 4 = 0 AND year %100 != 0 OR `year`% 400 = 0

Modulo ( % ) would've worked for MySQL as well, but I thought that explicit MOD function would be easier on eyes.