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...
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-...
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...
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'。
MONTHS_BETWEEN The MONTHS_BETWEEN function returns the number of months between two dates. The result is a numeric value that's positive if the first date is greater than the second date. It's negative if the first date is less than the second date. The result is...
postgresql oracle级别列到postgres的转换这将生成最近六个月的列表：
Active Record provides a great balance between the ability to perform simple queries simply, and also the ability to access the raw SQL sometimes required to get our jobs done. In this article, we will see a number of real-life examples of business needs that may arise at our jobs. They...
The idea of a DBMS only company is non-existent. Even if you look at the likes of Oracle, IBM, and Microsoft SQL Server, they have large consulting arms. Same case for EnterpriseDB and GreenPlum. In the case of EnterpriseDB and GreenPlum - I suspect their ratio between consulting/support ...
in both the portal and the CLI. The updated server logs feature is now easy to enable (and disable) through the Azure portal. Also, you can configure the retention period with options ranging between 1 to 7 days. Additionally, you can access anddownload your server log...
Overview of the Postgres work done at Microsoft in the last year, both on Azure & in the open source community.