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NEW QUESTION 36
Daniel is using the structured Query language to work with data stored in relational database.
He would like to add several new rows to a database table.
What command should he use?

  • A. UPDATE.
  • B. INSERT.
  • C. ALTER.
  • D. SELECT.

Answer: B

Explanation:
INSERT
The INSERT command is used to add new records to a database table.
The SELECT command is used to retrieve information from a database. It's the most commonly used command in SQL because it is used to pose queries to the database and retrieve the data that you're interested in working with.
The UPDATE command is used to modify rows in the database.
The CREATE command is used to create a new table within your database or a new database on your server.

 

NEW QUESTION 37
A database consists of one fact table that is composed of multiple dimensions. Depending on the dimension, each one can be represented by a denormalized table or multiple normalized tables. This structure is an example of a:

  • A. snowflake schema.
  • B. star schema.
  • C. non-relational schema.
  • D. transactional schema.

Answer: D

 

NEW QUESTION 38
What is the median of the following numbers?
13, 2, 65, 3, 5, 4, 7, 3, 4, 7, 8, 2, 4, 4, 60, 23, 43, 2

  • A. 4.5
  • B. 0
  • C. 1
  • D. 2

Answer: A

Explanation:
Correct answer B. 4.5
To find the median, sort the numbers in your dataset and find the one located in the middle. In this case, there are an even number of observations, so we take the two middle numbers (4 and 5) and use their average as the median, making the median value 4.5.
The mode is 4, the range is 63, and the number of observations is 18.

 

NEW QUESTION 39
You have a database where queries are performing slowly.
Investigating the results, you find that the database is performing a time-consuming table scan.
What action can best improve the query performance?

  • A. Recompiling the query.
  • B. Adding an index.
  • C. Sub setting the records.
  • D. Parameterizing the query.

Answer: B

Explanation:
You create an index to optimize performance when searching the table using the Find function and to establish uniqueness of table columns.
Indexing makes columns faster to query by creating pointers to where data is stored within a database. Imagine you want to find a piece of information that is within a large database. To get this information out of the database the computer will look through every row until it finds it.

 

NEW QUESTION 40
Oliver is designing an ETL process to copy sales data into a data warehouse on a hourly basis.
What approach should Oliver choose that would be most efficient and minimize the chance of losing historical data?

  • A. Bulk load.
  • B. Use ELT instead of ETL.
  • C. Purge and load.
  • D. Delta load.

Answer: D

Explanation:
Correct answer D. Delta load
Since Oliver needs to migrate changes every hour, a delta load is the best approach.

 

NEW QUESTION 41
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