因为该数字最多可以是15位数字，将强制转换为64位（8字节）整数。试试这个：

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

SELECT * FROM table
WHERE myint = mytext::int8

:: 强制转换运算符具有历史意义，但很方便。 Postgres还符合SQL标准语法

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

myint = cast ( mytext as int8)

如果您有文字文本，则想与 int进行比较，将 int 转换为文本：

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