to_date(col_name,'yyyymmdd'),其中col_name是date类型。 这个代码运行后,结果是:2018-11-16的date类型数据转换后变成了2017-11-01。 查阅官方文档: https://www.postgresql.org/docs/8.3/functions-formatting.html to_date函数的参数为字符串类型,所以上面的代码是等价于下面的代码: select TO_DATE('2018-11...
--日期格式转换 select e.employee_id,concat(e.last_name,e.first_name),to_char(e.hire_date,'DD-Month-YYYY') from employees e where e.department_id = 30 1. 2. 3. TO_CHAR 函数对数字的转换 语法:TO_CHAR(number,'format_model') 下面是在TO_CHAR 函数中经常使用的几种格式: select 1. 3...
'2021-06-01','2200-01-01' from sales_order; -- 装载sales_order_fact事实表 insert into sales_order_fact(order_sk,customer_sk,product_sk,order_date_sk,year_month,order_amount) select order_sk, customer_sk, product_sk, date_sk, to_char(order_date, 'YYYYMM')::int, order_amount ...
当前标签:greenplum to_date 日一二三四五六 26272829 8 9101112131415 161819202122 23242627281 2345678
and year_month<to_char(current_date,'yyyymm')::integer group by month_sk,product_sk,year_month; 3. 定期装载按月汇总只需要定期执行,不涉及实时性问题。fn_month_sum函数用于定期装载月销售订单周期快照事实表,函数定义如下。 代码语言:javascript ...
AI检测代码解析 [gpadmin@greenplum01 ~]$ createdb testDB -E utf-8 --创建用户-- [gpadmin@greenplum01 ~]$ export PGDATABASE=testDB --指定数据库名字 [gpadmin@greenplum01 ~]$ psql --连接本地数据库 psql (8.3.23) Type "help" for help. ...
通过本文的介绍,我们了解了Greenplum中常用的时间函数,包括now()、date_part()、age()和to_char()。这些时间函数为我们处理数据提供了强大的工具,我们可以利用它们进行数据分析、报表生成、时间间隔计算等多种操作。我个人认为时间函数的灵活性和实用性非常强,通过合理地运用时间函数,我们可以更好地理解和分析数据,帮...
A Greenplum Database system is comprised of multiple PostgreSQL instances (the master and segments) spanning multiple machines. To monitor a Greenplum Database system, you need to know information about the system as a whole, as well as status information of the individual instances. Thegpstateutil...
When the application needs to calculate the difference between the subfields of dates for Greenplum, it uses the function date_part, which allows you to retrieve subfields such as year, month, week, and day. In the following example queries, we calculate the...
When the application needs to calculate the difference between the subfields of dates for Greenplum, it uses the function date_part, which allows you to retrieve subfields such as year, month, week, and day. In the following example queries, we calculate the ...