PL/SQL Datatypes - questions and answers

PL/SQL Datatypes - questions and answers

1) What are the different datatypes that can be defined in a PL/SQL block?

A) Scalar
B) Composite
C) Reference
D) LOB
E) All mentioned above
F) None of the above
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2) Which of the following has internal components that can be manipulated individually, such as the elements of an array, record, or table?

A) A Composite
B) A LOB
C) A Reference
D) A Scalar
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3) SIGNTYPE lets you restrict an integer variable to the values -1, 0, and 1, which is useful in programming tri-state logic.

A) True
B) False
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4) Which subtypes are used to declare fixed-point numbers with a maximum precision of 38 decimal digits?

A) INTEGER,INT,SMALLINT
B) DOUBLE PRECISION,FLOAT
C) DEC,DECIMAL,NUMERIC
D) None of the above
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5) The BINARY_INTEGER and PLS_INTEGER datatypes are not identical.

A) True
B) False
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6) Use the ROWID datatype only for backward compatibility with old applications. For new applications, use the UROWID datatype.

A) True
B) False
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7) How many bytes does each character in the AL16UTF16 encoding take up?

A) 1
B) 2
C) 3
D) 6
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8) How many bytes does each character in the UTF8 encoding take up?

A) 1
B) 2
C) 3
D) All mentioned above
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9) Which datatype is used to store large blocks of character data in the database, in-line or out-of-line? Both fixed-width and variable-width character sets are supported.

A) BLOB
B) CLOB
C) BFILE
D) NCLOB
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10) PL/SQL is a transaction processing procedural language that has which of the following advantages?

A) Integration with database
B) Better Performance
C) Higher Productivity
D) Poratability
E) All mentioned above
F) None of the above
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11) A RECORD is a collection of data items, which differ from each other in data type, but are logically related.

A) True
B) False
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12) Which datatypes can be used with a RECORD Type?

A) NUMBER,VRCHAR2
B) %TYPE,OR %ROWTYPE
C) REF,CURSOR
D) BOTH A & B
E) BOTH B & C
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13) What is the advantage of using the %ROWTYPE datatype?

A)It is useful to retrieve an entire row from a table. If you do not use the %ROWTYPE datatype, then you have to declare variables for each column separately.
B)It can be used even if data type of the table columns is not known.
C)It ensures that data type of the variable changes dynamically if the underlying table is altered.
D) All mentioned above
E) Both A & B
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14) Is it possible to define a NOT NULL field in a record?

A) Yes
B) No
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15) Is it possible to define a CONSTANT value in a record?

A) Yes
B) No
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16) LOB locators are values, which specify the location of the large object.

A) True
B) False
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17) Oracle-supplied package called DBMS.J_OB is used to manipulate the LOB objects.

A) True
B) False
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18) The LOB objects can be stored in-line or out-of-line. The in-line storage means that objects are stored.

A) Along with the row
B) Outside the row
C) Both A & B
D) None of the above
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19) Which datatype is not allowed in the definition of PL/SQL record?

A) A Collection
B) A Scalar
C) Both A & B
D) None of the above
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20) Which data type supports only sequential access of objects?

A) LONG
B) LOB
C) Both A & B
D) None of the above
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21) Explicit datatypes, %TYPE and %ROWTYPE, without size specification can be used for parameters in a procedure.

A) True
B) False
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22) Can BOOLEAN datatype be used in functions that are called from SQL statements?

A) Yes
B) No
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