使用ALIAS和CAST with coalesce

Question

我是Hive的新手，所以如果我使用任何错误的条款，请原谅。我基本上想要转换/转换

的输出

SELECT to_date(EXPOSURE.ETL_START_DATE) as EXPOSURE_Date_Key

成一个字符串，也

coalesce(EXPOSURE_OPEN.open,0) as open,coalesce(EXPOSURE_CLOSED.closed,0) as closed

也成了一个字符串。

请帮忙。我已经在这方面努力了2天，但无法解决它。提前谢谢！

Answer 1

你可以像这样使用演员陈述

SELECT cast(to_date(EXPOSURE.ETL_START_DATE) as string) as EXPOSURE_Date_Key

SELECT cast(coalesce(EXPOSURE_OPEN.open,0) as open,coalesce(EXPOSURE_CLOSED.closed,0) as string) as closed