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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
| Function | Return Type | Description | Example |
|---|---|---|---|
|
) |
text |
convert time stamp to string | to_char(current_timestamp, ‘HH12:MI:SS‘) |
to_char ( interval, text ) |
text |
convert interval to string | to_char(interval ‘15h 2m 12s‘, ‘HH24:MI:SS‘) |
to_char ( int, text ) |
text |
convert integer to string | to_char(125, ‘999‘) |
|
precision |
text |
convert real/double precision to string | to_char(125.8::real, ‘999D9‘) |
to_char ( numeric, text ) |
text |
convert numeric to string | to_char(-125.8, ‘999D99S‘) |
to_date (text, text ) |
date |
convert string to date | to_date(‘05 Dec 2000‘, ‘DD Mon YYYY‘) |
to_number ( text, text ) |
numeric |
convert string to numeric | to_number(‘12,454.8-‘, ‘99G999D9S‘) |
to_timestamp ( text, text ) |
timestamp with time zone |
convert string to time stamp | to_timestamp(‘05 Dec 2000‘, ‘DD Mon YYYY‘) |
to_timestamp ( double precision ) |
timestamp with time zone |
convert Unix epoch to time stamp | to_timestamp(1284352323) |
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原文地址：http://www.cnblogs.com/esther-qing/p/5908593.html
