In R, suppose data frames x and y have only the variable `ID` in common. Suppose x has 5,000 rows and y has 10,000 rows. Finally, suppose that every ID in x is also in y. How many rows will semi_join(x, y) have?
In R, suppose data frames x and y have only the variable `ID` in common. Suppose x has 5,000 rows and y has 10,000 rows. Finally, suppose that every ID in x is also in y. How many rows will semi_join(x, y) have?
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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In R, suppose data frames x and y have only the variable `ID` in common. Suppose x has 5,000 rows and y has 10,000 rows. Finally, suppose that every ID in x is also in y.
How many rows will semi_join(x, y) have?
Expert Solution
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Step 1
Given
X=5000 Y=10000
The syntax of Semi Join was given below
semi_join(c, d, by = NULL, copy = TRUE, ...)
Join is a function used to join two table or Rows.
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