PostgreSQL类型转换

2024年1月7日 266次阅读 来源: PostgreSQL

   1.int装string

   select CAST (1234 AS text)

 

select to_char(1234，’999‘)

 

2.string转int
 select cast('999' as NUMERIC)

–5 附: PostgreSQL 类型转换函数

 
FunctionReturn TypeDescriptionExample
 to_char
 (timestamp, text
 )
 textconvert time stamp to string to_char(current_timestamp, ‘HH12:MI:SS’)
 to_char
 (
 interval, text
 )		 textconvert interval to string to_char(interval ’15h 2m 12s’, ‘HH24:MI:SS’)
 to_char
 (
 int, text
 )		 textconvert integer to string to_char(125, ‘999’)
 to_char
 (
 double
 precision
 , text
 )
 textconvert real/double precision to string to_char(125.8::real, ‘999D9’)
 to_char
 (
 numeric, text
 )		 textconvert numeric to string to_char(-125.8, ‘999D99S’)
 to_date
 (text, text
 )		 dateconvert string to date to_date(’05 Dec 2000′, ‘DD Mon YYYY’)
 to_number
 (
 text, text
 )		 numericconvert string to numeric to_number(‘12,454.8-‘, ’99G999D9S’)
 to_timestamp
 (
 text, text
 )		 timestamp with time zoneconvert string to time stamp to_timestamp(’05 Dec 2000′, ‘DD Mon YYYY’)
 to_timestamp
 (
 double precision
 )		 timestamp with time zoneconvert Unix epoch to time stamp to_timestamp(1284352323)
 
     原文作者：PostgreSQL 
     原文地址: https://www.cnblogs.com/esther-qing/p/5908593.html
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