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 |
---|---|---|---|
to_char ) | 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’) |
to_char 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) |