Understanding int8 postgresql requires examining multiple perspectives and considerations. PostgreSQL: Documentation: 18: 8.1. Attempts to store values outside of the allowed range will result in an error. The type integer is the common choice, as it offers the best balance between range, storage size, and performance. This perspective suggests that, the smallint type is generally only used if disk space is at a premium. What's the difference between BIGINT and INT8?
int8 is an alias for bigint. You can check for yourself - CREATE TABLE foo(bar int8);, then \d foo in psql. You'll see that column bar has type bigint. Postgres Pro Enterprise : Documentation: 17: 8.1. Furthermore, sQL Reference - INT8. INT8 is a data type in SQL, specifically employed in PostgreSQL.
It stands for 8-byte integer and it stores whole numbers, positive or negative, without decimal points. The range of values for INT8 is -9223372036854775808 to 9223372036854775807. Numeric Types - postgres-notes.
In order to allow numeric values to be sorted and used in tree-based indexes, PostgreSQL treats NaN values as equal, and greater than all non-NaN values. When rounding values, the numeric type rounds ties away from zero, while float types round ties to the nearest even number:
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