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mainframe Online Quiz - 16

Description: mainframe Online Quiz - 16
Number of Questions: 20
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Tags: mainframe
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A program can be cancelled by itself or subroutines called by it.

technology mainframe

  1. True

  2. False

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Correct Option: B

A group containing alphabetic fields can be redefined only by

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  1. Group containing alphabetic fields

  2. Group containing numeric fields

  3. Group containing alphabetic and numeric fields

  4. None of the above

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Correct Option: C

Group moves are always considered alphanumeric moves regardless of the elementary items in it.

technology mainframe

  1. True

  2. False

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Correct Option: A

How many alternative indexes can be specified maximum for a base cluster?

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  1. 256

  2. 253

  3. 255

  4. None of the above

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Correct Option: B

Which keyword allows the same copy to be used more than once in the same code by changing the replace value?

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  1. REDEFINES

  2. REPLACING

  3. REUSE

  4. REORG

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Correct Option: B

What is the key word which is used to pass value from COBOL code to JCL?

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  1. DD NAME

  2. SYSIN Parameter

  3. PARAM

  4. RETURN CODE

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Correct Option: D

Index is only used by

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  1. SET

  2. SEARCH

  3. PERFORM

  4. All the above

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Correct Option: D

A path is a logical relation established between ______ and _______ in VSAM catalog

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  1. Unique index and base clusters

  2. Primary index and base clusters

  3. Alternate index and base clusters

  4. Secondary index and base clusters

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Correct Option: C

The keyword OPTIONAL in select clause is used only for

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  1. Output files

  2. Input files

  3. Both the files

  4. All the above is correct

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Correct Option: B

SQL can

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  1. Create Database

  2. Update Table

  3. Drop Views

  4. Reverse Table

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Correct Option: A,B,C

With SQL, how can you return the number of records in the "Persons" table?

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  1. SELECT COUNT(*) FROM Persons

  2. SELECT COLUMNS() FROM Persons

  3. SELECT COLUMNS(*) FROM Persons

  4. SELECT COUNT() FROM Persons

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Correct Option: A

Which SQL statement is used to extract data from a database?

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  1. SELECT

  2. OPEN

  3. GET

  4. EXTRACT

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Correct Option: A

With SQL, how do you select a column named "FirstName" from a table named "Persons"?

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  1. SELECT FirstName FROM Persons

  2. SELECT Persons.FirstName

  3. EXTRACT FirstName FROM Persons

  4. EXTRACT Persons.FirstName

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Correct Option: A

Which SQL statement is used to return only different values?

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  1. SELECT DISTINCT

  2. SELECT DIFFERENT

  3. SELECT UNIQUE

  4. SELECT SAME

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Correct Option: A

AI Explanation

To answer this question, you need to understand the purpose of the DISTINCT keyword in SQL.

Option A) SELECT DISTINCT - This option is correct because the DISTINCT keyword is used in a SELECT statement to return only unique/distinct values from a column or set of columns. It eliminates duplicate rows from the result set.

Option B) SELECT DIFFERENT - This option is incorrect because there is no SQL keyword called "DIFFERENT". It is not a valid SQL statement.

Option C) SELECT UNIQUE - This option is incorrect because there is no SQL keyword called "UNIQUE" that is used to return only different values. The UNIQUE keyword is used to specify that a column or set of columns must contain unique values.

Option D) SELECT SAME - This option is incorrect because there is no SQL keyword called "SAME" that is used to return only different values. It is not a valid SQL statement.

The correct answer is Option A) SELECT DISTINCT. This option is correct because the DISTINCT keyword is used to return only unique/distinct values from a column or set of columns.

What are the different types of JOINS?

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  1. LEFT JOIN

  2. RIGHT JOIN

  3. FULL JOIN

  4. SELF JOIN

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Correct Option: A,B,C,D

UNION selects only distinct value by default.

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  1. True

  2. False

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Correct Option: A

CONSTRAINTS can be specified only on Creation of a table.

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  1. True

  2. False

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Correct Option: B

What do we call the PRIMARY KEY of a reference table?

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  1. Alternate Key

  2. Foreign Key

  3. Unique Key

  4. Alias Key

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Correct Option: B

Which funtion is used to return the total of a numeric field?

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  1. COUNT()

  2. GROUP BY()

  3. SUM()

  4. MAX()

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Correct Option: C

Indicate what is not correct in a REXX program.

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  1. A REXX clause can be coded in uppercase, lowercase or mixed case.

  2. Multiple instructions can be coded on 1 line, as long as they are separated by a ','

  3. A REXX program should start with a comment clause /* REXX */

  4. Continuation of REXX instructions is achieved by using a ',' as a continuation indicator

Show answer
Correct Option: B

AI Explanation

To answer this question, let's go through each option to understand why it is correct or incorrect:

Option A) A REXX clause can be coded in uppercase, lowercase, or mixed case. - This option is correct. In REXX, the case of the keywords does not matter, so it can be coded in uppercase, lowercase, or mixed case.

Option B) Multiple instructions can be coded on 1 line, as long as they are separated by a ',' - This option is incorrect. In REXX, multiple instructions are typically coded on separate lines, and not on the same line separated by a comma.

Option C) A REXX program should start with a comment clause /* REXX */ - This option is correct. It is good practice to start a REXX program with a comment clause to indicate that it is a REXX program.

Option D) Continuation of REXX instructions is achieved by using a ',' as a continuation indicator - This option is correct. In REXX, when an instruction is too long to fit on a single line, a comma (",") can be used as a continuation indicator to continue the instruction on the next line.

The correct answer is B. Multiple instructions cannot be coded on 1 line in REXX.

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