通过使用EXTRACT函数来提取月份和年份: 提取月份:使用EXTRACT(MONTH FROM date_column),其中date_column是包含日期的列名或表达式。返回的结果为整数类型的月份。 提取年份:使用EXTRACT(YEAR FROM date_column),其中date_column是包含日期的列名或表达式。返回的结果为整数类型的年份。 例如,假设有一个名为order_date的...
去掉原来的毫秒值 1向下取整函数floor()2selectfloor(extract(epochfrom'03:21:06.678'::time));3向上取整函数ceil()或ceiling(),这两个一样的4selectceil(extract(epochfrom'03:21:06.678'::time));5selectceiling(extract(epochfrom'03:21:06.678'::time));6四舍五入函数round()7selectround(extract(epoch...
1. 查询本周的数据。本周的数据是指从当前日期所在周的周一到当前日期所在的周日。可以使用以下SQL语句：SELECT * FROM 表名 WHERE date_column >= CURRENT_DATE - EXTRACT(DOW FROM CURRENT_DATE) AND date_column < CURRENT_DATE + 7 - EXTRACT(DOW FROM CURRENT_DATE)2. 查询本月的数据。本...
Sql - How to extract year and month from date in, Use the date_trunc method to truncate off the day (or whatever else you want, e.g., week, year, day, etc..). Example of grouping sales from orders by month: select SUM(amount) as sales, date_trunc('month', created_at) as dat...
2.4 EXTRACT(): 从给定的表达式中返回制定的日期时间字段 例如: selectfrom current_timestamp) from selectMONTH from current_timestamp) from selectDAY from current_timestamp) from selectHOUR from current_timestamp) from selectMINUTE from current_timestamp) from ...
(create_time/1000),'yyyy-mm-dd')<='2024-01-01'groupbyweekorderbyweek;selectto_char(created_at::DATE-(extract(dowfromcreated_at::TIMESTAMP)-1||'day')::interval,'YYYY-mm-dd')week,COUNT(*)asnumfrom"user"wherecreated_at>='2023-01-01'andcreated_at<='2024-01-01'groupbyweekorderby...
EXTRACT(year from cast(joindate as timestamp)) as Year, EXTRACT(month from cast(joindate as timestamp)) as Month, EXTRACT(day from cast(joindate as timestamp)) as Day, ... From Table Group by Year,Month,Day 此博客只是为了记忆相关知识点,大部分为网络上的文章,在此向各个文章的作者表示...
select extract(month from query_cxrq) from app_query extract(year from query_cxrq)年度 extract(month from query_cxrq)月份 extract(day from query_cxrq)日 --转换带时间的日期格式变量为shortdate格式时间字符串方法: 1、datetime.tostring("yyyy.MM.dd") ...
示例:SELECT DATE_TRUNC('month', CURRENT_DATE) - INTERVAL '1 month'; 使用DATE_PART函数获取上个月的年份和月份。示例:SELECT DATE_PART('year', DATE_TRUNC('month', CURRENT_DATE) - INTERVAL '1 month'); SELECT DATE_PART('month', DATE_TRUNC('month', CURRENT_DATE) - INTERVAL '1 month...
SELECT event_name, event_date FROM eventsORDER BY EXTRACT(MONTH FROM event_date) ASC; 这条语句将按活动月份从1月到12月进行排序。同样,可以使用其他日期函数,如YEAR、DAY等,根据具体需求进行排序。 2.1.3 多字段排序 在实际应用中,有时需要根据多个字段进行排序。例如,先按活动月份排序,再按活动日期排序:...