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databases Online Quiz - 90

Description: databases Online Quiz - 90
Number of Questions: 20
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Tags: databases
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What is ACID property?

  1. Atomicity,Concurrently,Isolation,Durability

  2. Atomicity,Consistency,Incremental,Durability

  3. Atomicity,Consistency,Isolation and Durability

  4. Atomicity,Concurrently,Incremental,Durability


Correct Option: A
  1. Read Uncommitted

  2. Read Committed

  3. Serializable

  4. Repeatable Read


Correct Option: A,B,C,D

Which of the following is a SQL Server 2005 Build number?

  1. 10.5.1702

  2. 8.00.223

  3. 9.00.4285

  4. 7.00.1152


Correct Option: C

Which of the following statements about subqueries are true? (Choose 3)

  1. Subqueries can have up to 16 levels of nesting

  2. Subqueries can have up to 50 levels of nesting

  3. Subqueries returning only one row can follow β€œ=” in a WHERE clause

  4. Subqueries returning only one row can follow β€œIN” in a WHERE clause


Correct Option: A,C,D
  1. Outer joins

  2. Multi-table updates and deletes

  3. Equi-joins

  4. Equi-join with a text column in select list


Correct Option: C

A UNION of two or more queries is valid provided the queries meet which of the following conditions? (Choose 3)

  1. All select lists in the UNION must have the same number of expressions

  2. Corresponding columns must have the same column names

  3. Corresponding columns must be of the same datatype or the server must be able to implicitly convert them

  4. Corresponding columns must be in the same order


Correct Option: A,C,D
  1. Duplicate rows are removed from the result set by default

  2. ASE evaluates a statement containing union operators from left to right

  3. Order by and group by clauses are not allowed in a union query

  4. The into clause can be used only in the first query


Correct Option: A,B,D

Which of the following are true about triggers? (Choose 2)

  1. the inserted and deleted tables are created manually

  2. triggers can be disabled using alter table

  3. a single trigger can be created for both insert and delete

  4. @@sqlstatus contains the number of rows affected


Correct Option: B,C

Table t and trigger trig are created as follows: create table t (a int) go create trigger trig on t for insert, update, delete as begin if @@rowcount > 1 rollback trigger end go The following transaction is now executed: begin tran insert t values (1) insert t values (2) insert t select * from t insert t values (3) commit go After completing this transaction, how many rows will table t contain?

  1. 0

  2. 1

  3. 2

  4. 3


Correct Option: D

Which T-SQL elements can be used in a stored procedure? (Choose 2)

  1. 'return', without a return value

  2. 'rollback transaction'

  3. 'rollback trigger'

  4. the built-in function 'update()'


Correct Option: A,B

What is the maximum number of characters that can be passed to a stored procedure through a single char or varchar parameter without being truncated?

  1. 127

  2. 255

  3. 16384

  4. equal to the server page size


Correct Option: C

The following trigger exists: create trigger trig on t for insert, update, delete as begin print 'This is 'trig' ' end The following command is now executed: create trigger trig on t for insert as begin print 'This is 'trig' ' end After executing this command, for which DML actions on table 't' will a trigger be fired?

  1. insert

  2. update

  3. insert, update, delete

  4. delete,update


Correct Option: A

Creation of which DB objects will cause a DDL trigger to fire?

  1. Index

  2. Cluster

  3. Package

  4. DB links

  5. Function


Correct Option: A,C,E
  1. Package

  2. Function

  3. Procedure

  4. Another DB trigger


Correct Option: C
Explanation:

To answer this question, the user needs to know the purpose of a trigger and what it can do.

A trigger is a set of instructions that are automatically executed in response to certain events in the database. A call statement inside the trigger body enables you to call other procedures or functions.

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

A. Package: A package is a collection of related functions, procedures, and other program objects. While a trigger can call a procedure or a function inside a package, it cannot directly call a package.

B. Function: A function is a named PL/SQL block that returns a value. A trigger can call a function to retrieve a value and use it in the execution of the trigger.

C. Procedure: A procedure is a named PL/SQL block that performs one or more specific tasks. A trigger can call a procedure to perform a specific task as part of the execution of the trigger.

D. Another DB trigger: A trigger can call another trigger inside the same schema, but it cannot call a trigger in another schema.

Therefore, the correct answer is:

The Answer is: C. Procedure

  1. Trigger type

  2. Trigger body

  3. Trigger event

  4. Trigger timing


Correct Option: A
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