作为 PostgreSQL 查询的一部分,如何将整数转换为字符串?

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时间:2020-09-10 23:53:57  来源:igfitidea点击:

How do I convert an integer to string as part of a PostgreSQL query?

postgresqlpostgresql-9.1

提问by spyd3rr

How do I convert an integer to string as part of a PostgreSQL query?

作为 PostgreSQL 查询的一部分,如何将整数转换为字符串?

So, for example, I need:

因此,例如,我需要:

SELECT * FROM table WHERE <some integer> = 'string of numbers'

where <some integer>can be anywhere from 1 to 15 digits long.

where<some integer>可以是 1 到 15 位数字。

回答by Brugolo

You can cast an integer to a string in this way

您可以通过这种方式将整数转换为字符串

intval::text

and so in your case

所以在你的情况下

SELECT * FROM table WHERE <some integer>::text = 'string of numbers'

回答by Bohemian

Because the number can be up to 15 digits, you'll meed to cast to an 64 bit (8-byte) integer. Try this:

由于该数字最多可以有 15 位数字,因此您需要强制转换为 64 位(8 字节)整数。尝试这个:

SELECT * FROM table
WHERE myint = mytext::int8

The ::cast operator is historical but convenient. Postgres also conforms to the SQL standard syntax

::转换运算符是历史的,但方便。Postgres 也符合 SQL 标准语法

myint = cast ( mytext as int8)


If you have literal text you want to compare with an int, cast the intto text:

如果您有想要与 an 进行比较的文字文本,请将int其转换int为文本:

SELECT * FROM table
WHERE myint::varchar(255) = mytext

回答by djgupta

You could do this:

你可以这样做:

SELECT * FROM table WHERE cast(YOUR_INTEGER_VALUE as varchar) = 'string of numbers'