oracle的函数cast进行类型转换

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oracle的函数cast进行类型转换

-- 字符串转数字number
select cast('123.456' as number(10,2)) from dual

-- 字符串转s数字integer
select cast('123.456' as integer) from dual

-- 数字转字符串
select cast(123.456 as varchar2(100)) from dual

-- 字符串转时间戳
select cast('25-1月 -19 12.49.40.123456789 下午' as timestamp) from dual

-- 时间戳转字符串
select cast(to_timestamp(to_char(sysdate,'yyyy-mm-dd hh24:mi:ss')||'.123456789','yyyy-mm-dd hh24:mi:ss.ff') as varchar2(100)) from dual

-- 字符串转日期
select cast('25-1月 -19' as date) from dual

-- 日期转字符串
select cast(sysdate as varchar2(100)) from dual