Tag: technology

Questions Related to technology

How can you make a property be read from the database but not modified in anyway
technology programming languages

  1. a) By using the insert="false" and update="false" attributes.

  2. b) By using the isinsert="false" and isupdate="false" attributes.

  3. c) By using the isinsert="no" and isupdate="no" attributes

  4. d) None

Show answer
Correct Option: A

25.) How to send signals to other processes?
technology programming languages

  1. a) Use sigsend()

  2. b) use kill()

  3. c) use signal()

  4. d) Only init can send signals

Show answer
Correct Option: B

Which statement is correct ?

technology programming languages

  1. a) A Session will not obtain a JDBC Connection (or a Datasource) unless it is needed

  2. b) A Session will obtain a JDBC Connection (or a Datasource) on object create

  3. c) A Session has no relation with JDBC Connection (or a Datasource)

  4. d) none of the above

Show answer
Correct Option: A

Which of the following correctly describe the aggregate functions?
technology databases

  1. It returns a single result row based on single rows

  2. It returns a single result row based on groups of rows

  3. It can only appear in ORDER BY clauses

  4. It cannot appear in select lists

Show answer
Correct Option: B

How to enable query cache in hibernate
technology programming languages

  1. a) hibernate.cache.query_cache true

  2. b) hibernate.cache.use_query_cache true

  3. c) hibernate.cache.query_cache yes

  4. d) none

Show answer
Correct Option: B

Following is built-in shell command.
technology operating systems

  1. cal

  2. ls

  3. kill

  4. echo

Show answer
Correct Option: D

Which of the following SQL statements can calculate and return the absolute value of -33?
technology databases

  1. SELECT ABS(-33) "Absolute" FROM DUAL;

  2. SELECT ABS(-33), Absolute FROM DUAL;

  3. SELECT ABS("-33") Absolute FROM DUAL;

  4. None of these

Show answer
Correct Option: A
Explanation:

To solve this question, the user needs to know the syntax for calculating the absolute value in SQL. The ABS function can be used to calculate the absolute value of a number.

Now, let's go through each option and explain why it is right or wrong:

A. SELECT ABS(-33) "Absolute" FROM DUAL; This option is correct. The ABS function is used to calculate the absolute value of a number, and the syntax in this statement is correct. The "Absolute" alias is used to rename the column with the calculated value.

B. SELECT ABS(-33), Absolute FROM DUAL; This option is incorrect. The "Absolute" alias is not defined in the statement. Additionally, the ABS function is used correctly.

C. SELECT ABS("-33") Absolute FROM DUAL; This option is incorrect. The quotation marks around the number indicate that it is a string, not a number. The ABS function cannot calculate the absolute value of a string.

D. None of these This option is incorrect. Option A is the correct answer.

The Answer is: A

If you are not certain that a matching row exists in the database then which method is the best ?
technology programming languages

  1. a) Session.load();

  2. b) Session.get();

  3. c) Session.fetch();

  4. d) None of the above

Show answer
Correct Option: B

Which statement is correct?
technology programming languages

  1. a) bag has index column

  2. b) bag permits duplicate element values

  3. c) bag does not permits duplicate element values

  4. d) None

Show answer
Correct Option: B
Explanation:

To solve this question, the user needs to have knowledge about the concept of a bag data structure. A bag is a collection of unordered elements that may contain duplicates.

Now, let's go through each option and explain why it is right or wrong:

a) bag has index column: This statement is incorrect. A bag is an unordered collection, which means it does not have an index column. Items in a bag are stored in any order.

b) bag permits duplicate element values: This statement is correct. A bag allows duplicate elements to be added to it. For example, a bag can contain two or more items with the same value.

c) bag does not permit duplicate element values: This statement is incorrect. A bag permits duplicate elements to be added to it. Therefore, this statement is false.

d) None: This option is incorrect because option B is correct.

The Answer is: B

Following commands can be used to create a file.
technology operating systems

  1. mv

  2. cat

  3. ed

  4. touch

Show answer
Correct Option: B,C,D