Which three statements are true about built-in data types? (Choose three.)
Which three statements are true about built-in data types? (Choose three.)
The default length for a CHAR column is always one character because if you define a CHAR column without specifying the length, it will default to 1 character. A BLOB stores unstructured binary data within the database, allowing you to store large amounts of binary data in the database itself. A BFILE stores unstructured binary data in operating system files, providing a reference in the database to access binary files stored outside of the database.
DEF for me, CHAR default is 1 byte, we can use: CREATE TABLE tmp (col CHAR);
Answer is A,E,F
If you do not specify a qualifier, the value of the NLS_LENGTH_SEMANTICS parameter of the session creating the column defines the length semantics, unless the table belongs to the schema SYS, in which case the default semantics is BYTE.
NOT ALWAYS ONE CHARACTER
you can't create a table in ORACLE without specifying the length in CHAR column