Homework Answers
Answer: Indexes should be created on columns used by WHERE and BY clauses.
Indexes are used for retrieve the records fast. So we have to mention the column names in WHERE clause and By clause in which we created the columns for fast retrieval of the records.
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Which of the following is true about indexes and index design? a. indexes usually speed up...
Which of the following statements about clustered indexes is FALSE? Select one: a. Creating two different...
Which of the following statements about clustered indexes is FALSE? Select one: a. Creating two different clustered indexes on a table is a good strategy if the table contains multiple key columns b. Clustered indexes do not work as well on columns that allow null values c. Primary key columns are good candidates for clustered indexes d. Clustered indexes are best used on columns whose values are unique
All of the following statements about non-clustered indexes are FALSE, except _______. Select one: a. Non-clustered...
All of the following statements about non-clustered indexes are FALSE, except _______. Select one: a. Non-clustered indexes are usually faster than clustered indexes b. Non-clustered indexes use row locators which point to the locations of the actual data rows c. The leaf nodes of a non-clustered index can only contain values from indexed columns d. A table can have only one non-clustered index
1) The advantage(s) of creating indexes in the database is/are 2) Which of the following statements...
1) The advantage(s) of creating indexes in the database
is/are
2) Which of the following statements is true?
3) Which of the following statements is true?
4) Identify the correct statement(s) about Columns and Column
Families of a Column Oriented database
5) You are designing a web application. You have a requirement
to provide a facility to the user to store his/her preferences on
the look-and-feel of the web pages of your application. According
to Fowler and Sadalage, which of...
2. Write a script that implements the following design: In the Downloads table, the user_id and...
2. Write a script that implements the following design: In the Downloads table, the user_id and product_id columns are the foreign keys. Create these tables in the ex schema. Create the sequences for the user_id, download_id, and product_id columns. Include a PL/SQL script to drop the table or sequence if it already exists. Include any indexes that you think are necessary. 3. Write a script that adds rows to the database that you created in exercise 2. Add two rows...
QUESTION 1 What is the most common relationship within a relational database? Select the best answer...
QUESTION 1 What is the most common relationship within a relational database? Select the best answer from the following. One-To-One relationship. o One-To-Many relationship. Many-To-Many relationship. Zero-To-Zero relationship. QUESTION 2 What is an "entity'? Select the best answer from the following. An entity, for our purposes, is the same as a table in the database. An entity represents one of the columns in an individual table. There are no entities in a relational database. Entities are only part of NoSQL...
Which of the following is NOT true about changing field names in a query? A) Field...
Which of the following is NOT true about changing field names in a query? A) Field names in aggregate queries are a composite of the selected aggregate function and the table field name. B) The field names assigned in an aggregate query can easily be changed either before or after the query is run. C) You must keep the original field name in the query design grid so Access knows what field to perform the calculation on. D) The default...
All of the following statements about enzymes are true EXCEPT a. they speed up chemical reactions...
All of the following statements about enzymes are true EXCEPT a. they speed up chemical reactions without changing themselves b. enzymes are proteins c. they are highly specific d. they are biological catalysts e. they are used up in a chemical reaction
Which of the following statements about columns in Apache Cassandra is TRUE? Select one: a. Related...
Which of the following statements about columns in Apache Cassandra is TRUE? Select one: a. Related columns are stored in the same row b. Columns have a name, a value, and a timestamp c. Rows in a column family can contain different numbers of columns d. All of the above statements about columns in Apache Cassandra are true
[Computer Science - CS2203 - Databases 1] Which of the following is true about a relation?...
[Computer Science - CS2203 - Databases 1] Which of the following is true about a relation? Select one: a. A relation is a one-dimensional table b. All the values in any column must be of the same type. c. There is a single attribute in each relation d. The order of the tuples of a relation is determined by the primary key
Which of the following statements about a cost-of-living index is true? (a) A typical index overstates...
Which of the following statements about a cost-of-living index is true? (a) A typical index overstates the effects of a price change because it ignores substitution in response to relative price changes. (b) A "chained" index generally states the true effect of price changes more accurately than does a more traditional (fixed-weight) index. (c) A cost-of-living index based on the general population (e.g., the consumer price index, or CPI) accurately captures the effects of price changes on specific demographic groups...
1) The advantage(s) of creating indexes in the database
is/are
2) Which of the following statements is true?
3) Which of the following statements is true?
4) Identify the correct statement(s) about Columns and Column
Families of a Column Oriented database
5) You are designing a web application. You have a requirement
to provide a facility to the user to store his/her preferences on
the look-and-feel of the web pages of your application. According
to Fowler and Sadalage, which of...
QUESTION 1 What is the most common relationship within a relational database? Select the best answer from the following. One-To-One relationship. o One-To-Many relationship. Many-To-Many relationship. Zero-To-Zero relationship. QUESTION 2 What is an "entity'? Select the best answer from the following. An entity, for our purposes, is the same as a table in the database. An entity represents one of the columns in an individual table. There are no entities in a relational database. Entities are only part of NoSQL...
Which of the following statements about a cost-of-living index is true? (a) A typical index overstates the effects of a price change because it ignores substitution in response to relative price changes. (b) A "chained" index generally states the true effect of price changes more accurately than does a more traditional (fixed-weight) index. (c) A cost-of-living index based on the general population (e.g., the consumer price index, or CPI) accurately captures the effects of price changes on specific demographic groups...
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