1,用于计算date1和date2之间有几个月。 如果date1在日历中比date2晚,那么months_between()就返回一个正数。2,如果date1在日历中比date2早,那么months_between()就返回一个负数。3,如果date1和date2日期一样,那么months_between()就返回一个0。 select months_between(sysdate, to_date('2020-8-9','yyyy-...
function get_age (pDOB date) return number is /* Return the the number of full years between the date given and sysdate. */ begin return floor(months_between(sysdate,pDOB)/12); end; 1. 2. 3. 4. 5. 6. 7. 再次注意我使用的是months_between()功能,因为并非所有年份都有365天. 在触发...
使用DATE_TRUNC函数将日期截断到月份级别。 使用BETWEEN操作符来获取指定范围内的日期。 下面是一个示例查询,获取前3个月的范围: 代码语言:txt 复制 SELECT * FROM your_table WHERE your_date_column BETWEEN DATE_TRUNC('MONTH', CURRENT_DATE - INTERVAL '3 months') AND DATE_TRUNC('MONTH', CURRENT_DATE...
The result is always a whole number of months if the day of the month of both date parameters is the same or both date parameters fall on the last day of their respective months. These examples show the MONTHS_BETWEEN function: → WrapCopy SELECT MONTHS_BETWEEN('15...
在使用BETWEEN、IN、IS NULL和IS NOT NULL的查询中,PostgreSQL也可以使用B-Tree索引。然而对于基于模式匹配操作符的查询,如LIKE、ILIKE、~和 ~*,仅当模式存在一个常量,且该常量位于模式字符串的开头时,如col LIKE 'foo%'或col ~ '^foo',索引才会生效,否则将会执行全表扫描,如:col LIKE '%bar'。
postgresql oracle级别列到postgres的转换这将生成最近六个月的列表：
It's been in beta since May, and the general availability release is coming any day. We've been following Postgres 13 closely here at pganalyze, and have been running the beta in one of our staging environments for several months now. There are no big new features in Postgres 13, but ...
Figure 1: This infographic-style diagram gives you a visual outline of the different Postgres workstreams underway at Microsoft as of May 2024, sharing highlights of just some of the work we’ve done over the last 8 months since I published the previous August 2023 versio...
Hubert Lubaczewski had a similar rant a couple of months ago inWhat should be changed in PostgreSQLand while we didn't agree with half the things he said and were on theThank god PostgreSQL doesn't support that misfeatureside, we do feel his pain in other areas. ...
Overview of the Postgres work done at Microsoft in the last year, both on Azure & in the open source community.