databases Online Quiz - 101

Description: databases Online Quiz - 101
Number of Questions: 20
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Tags: databases
Attempted 0/20 Correct 0 Score 0
  1. Permanent Table

  2. Set Table

  3. Multiset Table

  4. Volatile Table

Correct Option: D
  1. Indexes are only used in special cases

  2. Indexes are used to make table storage more efficient

  3. Indexes rarely make a difference in SQL performance

  4. Indexes exist solely to improve query speed

Correct Option: D
  1. The number of CPUs on the server

  2. The degree of parallelism on the tables

  3. The quality of the SQL optimization

  4. The use of bitmap indexes

Correct Option: C

We refer to a join as a self-join when…

  1. We are joining two tables only

  2. we are using left and right join together

  3. we are joining table to itself

  4. we are joining more than 2 tables

Correct Option: C
  1. SELECT * FROM Contest WHERE ContestDate >= '05/25/2006'

  2. SELECT * FROM Contest GROUPBY ContestDate >= '05/25/2006'

  3. SELECT * FROM Contest WHERE ContestDate < '05/25/2006'

  4. SELECT * FROM Contest HAVING ContestDate >= '05/25/2006'

Correct Option: A
  1. returns all the matching rows from 2 tables.

  2. returns only the rows from the first table, which have non-matching values with the second table in the field on which the 2 tables are joined.

  3. returns all rows from 2 tables.

  4. returns all rows that have matching value in the field on which the 2 tables are joined.

Correct Option: D
  1. An index is the same as alias.

  2. An index is a special way to join 2 or more tables.

  3. An index is a database table attribute, which speeds-up data search within a table.

  4. An index is a database row attribute, which speeds-up data search within a table.

Correct Option: C




Correct Option: C
  1. Removal of data redundancy

  2. The introduction of data redundancy

  3. The introduction of non-first normal form relations

  4. The introduction of SQL*Plus

Correct Option: B
  1. Access. Constant. Information. Data.

  2. Atomicity. Consistency. Isolation. Durability.

  3. Access. Constraint. Index. Data.

  4. Access. Consistency. Isolation. Data.

Correct Option: B
  1. UPDATE, DELETE, INSERT and SELECT statements.

  2. UPDATE statements only.

  3. DELETE statements only.

  4. INSERT statements only.

Correct Option: A

What is the result if two NULL values are compared to each other?

  1. TRUE

  2. FALSE


  4. NULL

Correct Option: D
  1. %rowtype, %toomanyrows, %found

  2. %found, %notfound, %rowcount

  3. %rowtype, %rowcount, %notfound

  4. None of the above

Correct Option: B
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