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Oracle 8i Certification
Oracle Exam key concepts related to the formats of folders and items
You need to store currency data and you know that data will
always have two digits to the right of the decimal points. However the number of
digits to the left of the decimal place will vary greatly. Which data type would be
most appropriate to store the data?
A. NUMBER
B. NUMBER(T)
C. LANG
D. LANGRA
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Answer: A
Explanation:
Answer A is correct because by default NUMBER is NUMBER(L, P)
type, which is always stored as variable-length data, where 1 byte is used to store the
exponent, 1 byte is used to store for every two significant digits of the number's
mantissa, and 1 byte is used for negative numbers if the number of significant digits
is less than 38 bytes.
Incorrect Answers:
B: NUMBER(T) type will not allow to keep more than T numbers of digits to the left of
the decimal place, but question says that it will vary greatly.
C: There is no type LANG in Oracle 8i.
D: Type LANGRA does not exists too.
Oracle 8, DBA Certification Exam Guide, Jason S. Couchman, p. 390
Chapter 8: Managing Database objects I