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
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ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
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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
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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