Sql 如何计算以年和月为单位的时间段

我希望能够得到客户注册的时间，到目前为止，我只得到了月份，但我希望得到年份和月份。可能有一个函数我没有使用，它可以计算出几年和几个月，而不仅仅是几个月。 谢谢

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除以12。但无需将

sysdate

转换为日期：

SELECT MONTHS_BETWEEN(SYSDATE, TO_DATE(REGISTER_DATE, 'DD-MON-YYYY')) / 12 AS "Registered for"
FROM A3_CUSTOMER
WHERE CUSTOMER_ID = 'C99166';

这返回十进制年份。要转换为年和月：

SELECT (FLOOR(MONTHS_BETWEEN(SYSDATE, TO_DATE(REGISTER_DATE, 'DD-MON-YYYY')) / 12) || ' Years and ' ||
        MOD(FLOOR(MONTHS_BETWEEN(SYSDATE, TO_DATE(REGISTER_DATE, 'DD-MON-YYYY')), 12) || ' Months'
       ) AS "Registered for"
FROM A3_CUSTOMER
WHERE CUSTOMER_ID = 'C99166';

如果

register\u date

存储为日期（应该是），则也不要转换该日期：

SELECT MONTHS_BETWEEN(SYSDATE, REGISTER_DATE) / 12 AS "Registered for"
FROM A3_CUSTOMER
WHERE CUSTOMER_ID = 'C99166';

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您可以使用以下时间间隔的月份：

Trunc(MONTHS_BETWEEN(SYSDATE, REGISTER_DATE)/ 12) as year,
Trunc(Mod(MONTHS_BETWEEN(SYSDATE, REGISTER_DATE), 12))  as month

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注册日期的数据类型是什么？

Trunc(MONTHS_BETWEEN(SYSDATE, REGISTER_DATE)/ 12) as year,
Trunc(Mod(MONTHS_BETWEEN(SYSDATE, REGISTER_DATE), 12))  as month