Oracle - Strings MCQ

Oracle – Strings

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1. What is the purpose of string datatypes in Oracle PL/SQL?

To store numeric values

To declare variables

To work with text-based data

To perform calculations

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2. Which datatype in PL/SQL is used for variable-length character strings?

DATE

VARCHAR2

BINARY_FLOAT

BOOLEAN

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3. What does the CHAR datatype in PL/SQL represent?

Binary data

Fixed-length character strings

Variable-length character strings

Numeric values

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4. What are string subtypes in PL/SQL?

Custom character datatypes

Numeric datatypes for storing strings

Variables used to store strings

Built-in functions for manipulating strings

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5. In PL/SQL, how can you specify string constants?

By using the NUMBER datatype

By using the TO_STRING function

By declaring a VARCHAR2 variable

By enclosing the string in single quotes (' ')

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6. What is the purpose of using nonprintable characters in strings in PL/SQL?

To include special characters

To improve readability

To store binary data

To simplify code

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7. In PL/SQL, how can you concatenate two strings together?

By using the ADD_STRING function

By using the SUBSTRING function

By using the || operator

By using the DIVIDE_STRING function

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8. How can you deal with the case of strings in PL/SQL?

By using the TRIM function

By using the CONVERT function

By using the REVERSE function

By using the UPPER and LOWER functions

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9. What is the traditional way to search for a substring within a string in PL/SQL?

By using the INSTR function

By using the TO_DATE function

By using the TO_NUMBER function

By using the CONCAT function

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10. In PL/SQL, what is the purpose of padding strings?

To remove extra spaces from a string

To simplify code

To increase the length of a string

To extract a substring

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11. What does the TRIM function do in PL/SQL?

Adds spaces to a string

Concatenates two strings

Searches for a substring

Removes spaces from the beginning and end of a string

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12. How can you perform regular expression searching and extracting in PL/SQL?

By using the UPPER and LOWER functions

By using the CONCAT function

By using the REGEXP_INSTR and REGEXP_SUBSTR functions

By using the TRIM function

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13. In PL/SQL, how do you work with empty strings?

By using the NOT NULL condition

By using the CONCAT function

By using the EMPTY_STRING function

By using the IS NULL condition

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14. What can happen when mixing CHAR and VARCHAR2 values in PL/SQL?

The values will be compared numerically

An error will occur

The values will be automatically converted

The values will be concatenated

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15. What is the primary purpose of the VARCHAR2 datatype in PL/SQL?

To store numeric values

To store fixed-length character strings

To store variable-length character strings

To store binary data

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Oracle – Strings MCQ