SQL base types: integer vs int?

Question

For query language (SQL) functions, what's the difference between the int and integer base types?

How do you know?

Answer 1

In Postgresql int and int4 are aliases for integer, a signed four-byte integer

http://www.postgresql.org/docs/current/static/datatype.html#DATATYPE-TABLE

Answer 2

Int and Integer are the same

"The keyword INT is a synonym for INTEGER"

Similarly

"The keywords DEC and FIXED are synonyms for DECIMAL"

Sql Numeric Documentation Source