What are int8, int64 and string in postgresql?

@ryan.murray 

In PostgreSQL, int8 is a data type that represents a signed 8-byte integer, int64 is a data type that represents a signed 64-bit integer, and string is a data type that represents a variable-length character string.

• int8 is commonly used for storing large integer values, such as primary keys or unique identifiers. It has a range of -9223372036854775808 to 9223372036854775807.
• int64 is similar to int8 but has a larger range of values, from -9223372036854775808 to 9223372036854775807.
• String is used for storing textual data of variable length. It can hold any sequence of characters, such as letters, numbers, and symbols. Strings in PostgreSQL are stored as variable-length character data, meaning they can be of any length (up to the maximum allowed by the database configuration).