我有一个无法在PostgreSQL服务器上运行的MySQL语句。
这是原始的MySQL查询：
SELECT count(*) AS howmany
FROM members
WHERE member_status =1
AND member_sex = 'male'
AND (YEAR( '2015-12-31' ) - YEAR( member_birthdate ) ) -
( RIGHT( '2015-12-31', 5 ) < RIGHT( member_birthdate, 5 ) )
BETWEEN 27 AND 40;
这是我的方法：
SELECT COUNT(*) AS howmany FROM members
WHERE member_status =1
AND member_sex ='male'
AND (EXTRACT(YEAR FROM '2015-12-31'::date) - EXTRACT(YEAR FROM member_birthdate))
BETWEEN 27 AND 40;
目标是，我想知道在2015年12月31日合格日期内27岁到40岁之间的会员人数。我不知道如何转换查询的正确部分。
您可以使用AGE功能：
SELECT COUNT(*) AS howmany
FROM members
WHERE member_status =1
AND member_sex ='male'
AND extract(year from age(timestamp '2015-12-31', member_birthdate))
BETWEEN 27 AND 40;
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