Hive中CAST（）函数用法

Posted 2023-04-26

参考技术A Cast(字段名 as 转换的类型 )，其中类型可以为：

CHAR[(N)] 字符型
DATE 日期型
DATETIME 日期和时间型
DECIMAL float型
SIGNED int
TIME 时间型

例如表table1
date
2015-11-03 15:31:26
select cast(date as signed) as date from table1;
结果如下：
date
20151103153126
select cast(date as char) as date from table1;
结果如下：
date
2015-11-03 15:31:26
select cast(date as datetime) as date from table1;
结果如下：
date
2015-11-03 15:31:26
select cast(date as date) as date from table1;
结果如下：
date
2015-11-03
select cast(date as time) as date from table1;
结果如下：
date
15:31:26
这里date对应日期，time对应时间

Hive函数用法：Cast(字段名 as 转换的类型 )

Cast(字段名 as 转换的类型 )，其中类型可以为：

• CHAR[(N)] 字符型
• DATE 日期型
• DATETIME 日期和时间型
• DECIMAL float型
• SIGNED int
• TIME 时间型

例子

select cast(date as signed) as date from table1; 
 
-- 结果如下：
date
20151103153126
 
 
select cast(date as char) as date from table1;
 
-- 结果如下：
date
2015-11-03 15:31:26
 
select cast(date as datetime) as date from table1;
-- 结果如下：
date
2015-11-03 15:31:26
 
 
select cast(date as date) as date from table1;
 
--结果如下：
date
2015-11-03
 
 
select cast(date as time) as date from table1;
-- 结果如下：
date
15:31:26
 
 
这里date对应日期，time对应时间