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Databricks Certified Data Analyst Associate Exam - Topic 3 Question 35 Discussion

Consider the following two statements:Statement 1:Statement 2:Which of the following describes how the result sets will differ for each statement when they are run in Databricks SQL?
E) When the first statement is run, all rows from the customers table will be returned and only the customer_id from the orders table will be returned. When the second statement is run, only those rows in the customers table that do not have at least one match with the orders table on customer_id will be returned. Based on the images you sent, the two statements are SQL queries for different types of joins between the customers and orders tables. A join is a way of combining the rows from two table references based on some criteria. The join type determines how the rows are matched and what kind of result set is returned. The first statement is a query for a LEFT SEMI JOIN, which returns only the rows from the left table reference (customers) that have a match with the right table reference (orders) on the join condition (customer_id). The second statement is a query for a LEFT ANTI JOIN, which returns only the rows from the left table reference (customers) that have no match with the right table reference (orders) on the join condition (customer_id). Therefore, the result sets for the two statements will differ in the following way: The first statement will return a subset of the customers table that contains only the customers who have placed at least one order. The number of rows returned will be less than or equal to the number of rows in the customers table, depending on how many customers have orders. The number of columns returned will be the same as the number of columns in the customers table, as the LEFT SEMI JOIN does not include any columns from the orders table. The second statement will return a subset of the customers table that contains only the customers who have not placed any order. The number of rows returned will be less than or equal to the number of rows in the customers table, depending on how many customers have no orders. The number of columns returned will be the same as the number of columns in the customers table, as the LEFT ANTI JOIN does not include any columns from the orders table. The other options are not correct because: A . The first statement will not return all data from the customers table, as it will exclude the customers who have no orders. The second statement will not return all data from the orders table, as it will exclude the orders that have a matching customer. Neither statement will fill in any missing data with NULL, as they do not return any columns from the other table. C . There is a difference between the result sets for both statements, as explained above. The LEFT SEMI JOIN and the LEFT ANTI JOIN are not equivalent operations and will produce different outputs. D . Both statements will not fail, as Databricks SQL does support those join types. Databricks SQL supports various join types, including INNER, LEFT OUTER, RIGHT OUTER, FULL OUTER, LEFT SEMI, LEFT ANTI, and CROSS. You can also use NATURAL, USING, or LATERAL keywords to specify different join criteria. E . The first statement will not return only the customer_id from the orders table, as it will return all columns from the customers table. The second statement is correct, but it is not the only difference between the result sets.
A) The first statement will return all data from the customers table and matching data from the orders table. The second statement will return all data from the orders table and matching data from the customers table. Any missing data will be filled in with NULL.
B) When the first statement is run, only rows from the customers table that have at least one match with the orders table on customer_id will be returned. When the second statement is run, only those rows in the customers table that do not have at least one match with the orders table on customer_id will be returned.
C) There is no difference between the result sets for both statements.
D) Both statements will fail because Databricks SQL does not support those join types.

Databricks Certified Data Analyst Associate Exam - Topic 3 Question 35 Discussion

Actual exam question for Databricks's Databricks Certified Data Analyst Associate exam
Question #: 35
Topic #: 3
[All Databricks Certified Data Analyst Associate Questions]

Consider the following two statements:

Statement 1:

Statement 2:

Which of the following describes how the result sets will differ for each statement when they are run in Databricks SQL?

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Jesusa
7 months ago
Nah, option C is misleading; there’s definitely a difference!
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Melita
7 months ago
Wait, are we sure Databricks supports those join types?
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Annmarie
7 months ago
Statement 1 is a LEFT SEMI JOIN, right?
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Gayla
7 months ago
Totally agree, it's all about those matching customers!
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Dana
7 months ago
I think option B is spot on!
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Brent
8 months ago
I believe the first statement returns all customers with orders, and the second one gives us customers without any orders. That sounds right, doesn't it?
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Leonie
8 months ago
I'm a bit confused about the options. I feel like both statements should return different results, but I can't recall the exact details.
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Gail
8 months ago
I remember practicing a question similar to this, and I think the LEFT SEMI JOIN only returns matching customers, while the LEFT ANTI JOIN gives us those without orders.
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Roosevelt
8 months ago
I think the first statement is a LEFT SEMI JOIN, but I'm not entirely sure how it differs from a LEFT ANTI JOIN.
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Glenn
9 months ago
I'm a bit unsure about the nuances of these join types, but I'll carefully read through the question and the options to try to identify the correct answer.
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Krystal
9 months ago
This is a tricky one, but I'm confident I can work through it. I just need to make sure I understand the semantics of each join type and how they'll be applied in these specific queries.
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Rosamond
9 months ago
Okay, I've got a strategy here. I'll focus on the key differences between the two join types and how they will affect the rows and columns returned in the result sets.
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Benedict
9 months ago
Hmm, the join types in these statements are not straightforward. I'll need to review my knowledge of LEFT SEMI and LEFT ANTI joins to determine how they differ in their output.
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Herman
9 months ago
This question is testing my understanding of different join types in SQL. I think I can approach it by carefully analyzing the two statements and the expected result sets.
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Ligia
1 year ago
But A says the first statement will return all data from the customers table, which is not true.
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Selma
1 year ago
I bet the person who wrote this question is a real SQL nerd. They probably spend their weekends debating the merits of different join types over a cup of coffee.
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Leeann
1 year ago
Definitely! It takes a special kind of person to be so passionate about join types.
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Casandra
1 year ago
I know, right? They must really love SQL to come up with such detailed questions.
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Dylan
1 year ago
Eve
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Hubert
1 year ago
I disagree, I believe the correct answer is B.
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Ligia
1 year ago
I think the correct answer is A.
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