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SQL代码如下：
SELECT sn AS 季度,
(sn - 1) * 3 + 1 AS 开始月份,
ADD_MONTHS(TRUNC(TO_DATE(年, ‘yyyy‘), ‘yy‘), (sn - 1) * 3) AS 开始日期,
ADD_MONTHS(TRUNC(TO_DATE(年, ‘yyyy‘), ‘yy‘), sn * 3) - 1 AS 结束日期
FROM (SELECT ‘2015‘ AS 年, LEVEL AS sn FROM DUAL CONNECT BY LEVEL <= 4);
执行结果如下：
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原文地址：http://www.cnblogs.com/minisculestep/p/4899079.html
