selectcast('1234'asinteger) ; --用substring截取字符串,从第8个字符开始截取2个字符:结果是12 selectcast(substring('1234abc12',8,2)asinteger) ---使用to_number函数来转换成整数 ---to_number(text, text) 返回的类型 numeric 把字串转换成numeric to_number('12,454.8-', '99G999D9S') selectto_...
--用substring截取字符串,从第8个字符开始截取2个字符:结果是12 selectcast(substring('1234abc12',8,2)asinteger) ---使用to_number函数来转换成整数 ---to_number(text, text) 返回的类型 numeric 把字串转换成numeric to_number('12,454.8-', '99G999D9S') selectto_number('12121','999999999')...
SELECTCAST('15'ASINTEGER),'2020-03-15'::DATE;int4|date|---|---|15|2020-03-15| 如果数据无法转换为指定的类型,将会返回错误: SELECTCAST('A15'ASINTEGER);SQL错误[22P02]:错误:无效的类型integer输入语法:"A15"位置:14 to_date 函数 to_date(string, format)函数用于将字符串 string 按照 format ...
You don't need to_number() for this. Just cast the string to an integer: select '00005469'::integer; or using standard SQL: select cast('00005469' as integer); Share Follow answered May 18, 2016 at 8:26 user330315 Add a comment 0 To be more safe if your column has decim...
select'a'::int,cast('3.12q'asnumeric)[22P02]错误: 无效的类型integer输入语法: "a" 位置:8 to_date 函数 to_date(string, format)函数用于将字符串string按照format格式转换为日期类型。 SELECTto_date('2023/03/25','YYYY/MM/DD'),to_date('20230326','yyyymmdd');2023-03-252023-03-26 ...
I'm having this problem when casting a column from string to decimal. The problem is that after I do the cast on the column, it writes it in the new table as decimal, but rounding the decimals. I don't want that, I just want that it keeps all the decimals that the original tab...
1.4.TO_TIMESTAMP: 功能:将字符串转换为时间戳变量,使用方法与TO_DATE相似。 1.5 CAST(value AS type): 功能:将一个变量值转换为第二个参数的类型 例如:select cast('03-4月-2008' as DATE) FROM DUAL; 2.日期函数: 2.1 ADD_MONTHS(a_date DATE,a_number NUMBER): ...
In PostgreSQL, the“::”operator and CAST operator are used for converting/casting one type to another. Using the TO_NUMBER(), CAST(), and“::”operator, we can convert a string into a numeric type such as an integer, double, or decimal. ...
Postgres query to check a string is a number Ask Question Asked 10 years, 8 months ago Modified 1 year, 6 months ago Viewed 144k times Report this ad83 Can anyone tell me the query to check whether a string is a number(double precision). It should return true if the string is number...
SELECT myfield::integer FROM mytable WHERE myfield ~ E'^\d+$';Postgres将其条件快捷键,因此你...