oracle的TO_CHAR(TO_DATE(CTRDATE,'yyyyMMdd), 3456 'fmdd/Mon/yyyy, 'nls_date_language-american') 转化为hive写法

在Hive中，可以使用from_unixtime()和unix_timestamp()函数来实现类似于Oracle中TO_CHAR和TO_DATE函数的功能。

以下是将Oracle中的语句转换为Hive的语句：

from_unixtime(unix_timestamp(substr(CTRDATE,1,8),'yyyyMMdd'),'dd/MMM/yyyy') as result

其中，substr()函数用于截取日期字符串的前8个字符（即年月日部分），然后将其转换为Unix时间戳（即从1970年1月1日00:00:00开始的秒数），最后使用from_unixtime()函数将Unix时间戳格式化为要求的日期格式。

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oracle的TO_CHAR(TO_DATE(CTRDATE,'yyyyMMdd), 'fmdd/Mon/yyyy, 'nls_date_language-american') 转化为hive写法

以下是将Oracle中的语句转换为Hive的语句：

from_unixtime(unix_timestamp(substr(CTRDATE,1,8),'yyyyMMdd'),'dd/Mon/yyyy') as result

其中，substr()函数用于截取日期字符串的前8个字符（即年月日部分），然后将其转换为Unix时间戳（即从1970年1月1日00:00:00开始的秒数），最后使用from_unixtime()函数将Unix时间戳格式化为要求的日期格式。要注意的是，Hive中的月份缩写是大小写敏感的，需要确保与数据源中的缩写一致。

TRUNC( ( to_char( SYSDATE, 'yyyyMMdd' ) - to_char( BIRTH_DATE, 'yyyyMMdd' ) ) / 10000 ) AS age

The above SQL code calculates the age of a person based on their birth date and the current date.

Explanation of the code:

- SYSDATE is a built-in function in Oracle that returns the current system date and time.
- to_char() is a function that converts a date or timestamp value to a character string in a specified format.
- 'yyyyMMdd' is the date format used in this code, where 'yyyy' represents the year with four digits, 'MM' represents the month with two digits, and 'dd' represents the day with two digits.
- BIRTH_DATE is a column name in a table that stores the birth date of a person.
- The subtraction of the birth date from the current date yields the number of days between the two dates. This value is divided by 10000 to convert the number of days to years.
- TRUNC() is a function that truncates a number to a specified number of decimal places. In this code, it is used to remove any fractional part from the age value.

Overall, the code calculates the age of a person by subtracting their birth date from the current date, converting the result from days to years, and truncating any fractional part.