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文章 2023-03-24 来自：开发者社区

【SQL开发实战技巧】系列（二十）：数据仓库中时间类型操作（进阶）获取季度开始结束时间以及如何统计非连续性时间的数据

前言本篇文章讲解的主要内容是：汇总报表时常要求按季度分类汇总这就需要通过给定年份获取对应的季度开始结束时间、业务数据不连续的情况下如何统计所有年份数据、如何统计相同月份与周内日期聘用的员工、如何返回2月或12月聘用的所有员工以及周二聘用的所有员工【SQL开发实战技巧】这一系列博主当作复习旧知识来进行写作，毕竟SQL开发在数据分析场景非常重要且基础，面试也会经常问SQL开发和调优经验，相信当我写完....

文章 2023-03-24 来自：开发者社区

【SQL开发实战技巧】系列（十九）：数据仓库中时间类型操作（进阶）如何一个SQL打印当月或一年的日历？如何确定某月内第一个和最后—个周内某天的日期？

前言本篇文章讲解的主要内容是关于时间类型操作的进阶操作，这些操作在数仓中也属于比较难一些的时间操作案例了：如何一个SQL打印出当月日历或当年日历？？？如何统计一年内属于周内某一天的所有日期???如何确定某月内第一个和最后—个周内某天的日期？？？【SQL开发实战技巧】这一系列博主当作复习旧知识来进行写作，毕竟SQL开发在数据分析场景非常重要且基础，面试也会经常问SQL开发和调优经验，相信当我写完这....

文章 2023-03-24 来自：开发者社区

【SQL开发实战技巧】系列（十八）：数据仓库中时间类型操作（进阶）INTERVAL、EXTRACT以及如何确定一年是否为闰年及周的计算

前言本篇文章讲解的主要内容是：日期操作函数(INTERVAL、EXTRACT)的使用以及如何确定一年是否为闰年及周的计算两个小案例【SQL开发实战技巧】这一系列博主当作复习旧知识来进行写作，毕竟SQL开发在数据分析场景非常重要且基础，面试也会经常问SQL开发和调优经验，相信当我写完这一系列文章，也能再有所收获，未来面对SQL面试也能游刃有余~。一、SYSDATE能得到的信息经常看到有人因为不熟悉....

文章 2023-03-24 来自：开发者社区

【SQL开发实战技巧】系列（十七）：数据仓库中时间类型操作（初级）确定两个日期之间的工作天数、计算—年中周内各日期出现次数、确定当前记录和下一条记录之间相差的天数

前言本篇文章讲解的主要内容是：如何确定两个日期之间的工作日有多少天、计算—年中每周内各日期出现次数、确定当前记录和下一条记录之间相差的天数【SQL开发实战技巧】这一系列博主当作复习旧知识来进行写作，毕竟SQL开发在数据分析场景非常重要且基础，面试也会经常问SQL开发和调优经验，相信当我写完这一系列文章，也能再有所收获，未来面对SQL面试也能游刃有余~。一、确定两个日期之间的工作天数现在有个需求：....

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