Creating a temporary view in DataFrame

Spark SQL createOrReplaceTempView method

Prev Question Next Question

Question

You have created a data DataFrame.But before issuing SQL Queries, you decide to save your DataFrame as a temporary view.

Which of the following DataFrame method will help you in creating the temporary view?

Answers

Explanations

Click on the arrows to vote for the correct answer

A. B. C. D. E.

Correct Answer: B

Before issuing SQL queries, DataFrame needs to be saved as a table or temporary view.

createOrReplaceTempView function is used to create the temporary view.

Python # Register table so it is accessible via SQL Context %python data. createOrReplaceTempView("date_geo")

Option A is incorrect.

There is no DataFrame method like createTempView.

Option B is correct.

createOrReplaceTempView function is used to create the temporary view.

Option C is incorrect.

There is no such method as ReplaceTempView.

Option D is incorrect.

There is no such method as createTempViewForDataFrame.

Option E is incorrect.

There is no DataFrame method like CreateorReplaceDFTempView.

To know more about DataFrames, please visit the below-given link:

The correct answer is B. createOrReplaceTempView.

In Apache Spark, a DataFrame is a distributed collection of data organized into named columns. It is conceptually equivalent to a table in a relational database or a data frame in R/Python, but with optimizations for distributed processing on a cluster.

When you have created a DataFrame in Apache Spark and want to use it in SQL queries, you need to create a temporary view of the DataFrame. A temporary view is a name that refers to a DataFrame or table in Apache Spark SQL. It can be used to execute SQL queries on the DataFrame.

To create a temporary view of a DataFrame, you can use the createOrReplaceTempView method. This method creates or replaces a temporary view with the given name. If the view already exists, it will be replaced. This method takes a single argument, which is the name of the temporary view to be created or replaced.

The other options listed in the question are not valid DataFrame methods for creating a temporary view.

  • Option A (createTempView) is a valid method for creating a temporary view, but it does not allow replacing an existing view.
  • Option C (ReplaceTempView) is not a valid method.
  • Option D (createTempViewForDataFrame) is not a valid method.
  • Option E (CreateorReplaceDFTempView) is not a valid method.

Prev Question Next Question