Tag: technology

Questions Related to technology

It is possible to re-load an object and all its collections at any time, using the xxxx() method. This is useful when database triggers are used to initialize some of the properties of the object.What is the xxxx() method ?
technology programming languages

  1. a) refresh();

  2. b) flush();

  3. c) fetch();

  4. d) load()

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Correct Option: A

What does the following SQL script do? SELECT AVG(MAX(salary)) FROM employees GROUP BY department_id;
technology databases

  1. it has a syntax error, the AVG clause is not valid

  2. it calculates the average of the maximum salaries of all the departments

  3. it has a syntax error, the MAX clause is not valid

  4. it has no error, but the GROUP BY clause is not effective

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Correct Option: B

What is the root level element in a hibernate mapping file?
technology programming languages

  1. a)

  2. b)

  3. c)

  4. d) None

Show answer
Correct Option: C

Which are DML statements? (Choose all that apply)

technology databases

  1. COMMIT

  2. MERGE

  3. UPDATE

  4. DELETE

  5. CREATE

  6. DROP

Show answer
Correct Option: A,B,C,D

AI Explanation

To answer this question, you need to understand the concept of Data Manipulation Language (DML). DML statements are used to manipulate the data stored in the database. Let's go through each option to understand why it is correct or incorrect:

Option A) COMMIT - This option is a DML statement. It is used to save the changes made to the database since the last COMMIT or ROLLBACK statement.

Option B) MERGE - This option is a DML statement. It is used to perform insert, update, or delete operations on a target table based on the results of a join with a source table.

Option C) UPDATE - This option is a DML statement. It is used to modify existing records in a table.

Option D) DELETE - This option is a DML statement. It is used to delete existing records from a table.

Option E) CREATE - This option is not a DML statement. CREATE statements are part of the Data Definition Language (DDL) and are used to create database objects such as tables, indexes, and views.

Option F) DROP - This option is not a DML statement. DROP statements are part of the DDL and are used to remove database objects such as tables, indexes, and views.

The correct answers are A, B, C, and D. These options are correct because they are DML statements used for manipulating data in the database.

Which is simplest and correct code snippet needs to be put in the main function to replace the value object of the HashMap for the key “orange”?

technology programming languages

  1. itemMap.remove("orange"); itemMap.put("orange", new Item("Orange") );

  2. ((Item)itemMap.get(“orange”)).name = “Orange”;

  3. itemMap.put("orange", new Item("Orange") );

  4. None of above

Show answer
Correct Option: B

Which is the most performance efficient implementation for assignCode method from the given options?

technology programming languages

  1. code attribute cannot be changed as Item class doesn’t have setter method for it.

  2. for (int i = 0; i < itemList.size(); i++) { if(itemList.get(i) != null) { ((Item)itemList.get(i)).code = 50+i; } }

  3. int i = 0; Item im = null; while (i < itemList.size()) { im = (Item)itemList.get(i); if(im != null) { im.code = 50+i; } i++; }

  4. int i = 0; Item im = null; Iterator itr = itemList.iterator(); while (itr.hasNext()) { im =(Item) itr.next(); im.code = 50+i; i++; }

Show answer
Correct Option: D

Which of the given options code is correct and will not waste memory.

technology programming languages

  1. Item im = new Item(null); im = (Item ) itemList.get(0);

  2. Item im = new Item(“Done”); im = (Item ) itemList.get(0);

  3. Item im = null; im = (Item ) itemList.get(0);

  4. All of the above.

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Correct Option: C

Which code in the given options if put in below Main class will not print “Done”?

technology programming languages

  1. Function call:- changeName(im); Function implementation :- { im.name = "Done"; return null; }

  2. Function call:- changeName(im); Function implementation :- { im = new Item("Done"); return null; }

  3. Function call :- im = changeName(im); function implementation :- { Item otherObject = new Item("Done"); return otherObject; }

  4. All of the above

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Correct Option: B

Which Function can return a non-Null value if passed null arguments?
technology databases

  1. NULLIF

  2. LENGTH

  3. CONCAT

  4. INSTR

  5. TAN

Show answer
Correct Option: C

In what scenario the sequence field contains the value of 'E' in Sort utility?
technology mainframe

  1. user modified field to be sort ascending

  2. No specific order specified

  3. Jumbled order

  4. None of the above

Show answer
Correct Option: A