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Snowflake ADA-C01 Exam - Topic 1 Question 48 Discussion

Actual exam question for Snowflake's ADA-C01 exam
Question #: 48
Topic #: 1
[All ADA-C01 Questions]

An Administrator needs to create a sample of the table LINEITEM. The sample should not be repeatable and the sampling function should take the data by blocks of rows.

What select command will generate a sample of 20% of the table?

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Suggested Answer: B

This command will generate a sample of 20% of the table by using the SYSTEM (or BLOCK) sampling method, which selects each block of rows with a probability of 20/100. This method is suitable for taking data by blocks of rows, as the question requires. According to theSnowflake documentation, ''SYSTEM (or BLOCK): Includes each block of rows with a probability of p/100. Similar to flipping a weighted coin for each block of rows. This method does not support fixed-size sampling.'' The other options are either incorrect or do not meet the requirements of the question. Option A uses the BERNOULLI (or ROW) sampling method, which selects each row with a probability of 20/100, but does not take data by blocks of rows. Option C uses the BLOCK sampling method, but specifies a fixed number of rows (20) instead of a percentage (20%). Option D uses the SYSTEM sampling method, but specifies a seed value (1), which makes the sampling repeatable, contrary to the question.


by Terry at Jan 27, 2026, 09:48 AM

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Leana
15 days ago
Wait, does that really give a non-repeatable sample?
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Barbra
21 days ago
I agree with Justine, that’s the standard way!
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Shaniqua
26 days ago
I think it should be TABLESAMPLE BERNOULLI instead.
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Jaime
1 month ago
Sounds right, but isn't that just for certain databases?
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Justine
1 month ago
You can use TABLESAMPLE SYSTEM (20).
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Ronald
1 month ago
This question is making me hungry. Anyone else craving a nice juicy steak sample?
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Annabelle
2 months ago
Hmm, I wonder if there's a way to make the sample repeatable. You know, for those of us who like to live on the edge.
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Ilene
2 months ago
I'd use the TABLESAMPLE clause for this. Seems like the most straightforward way to get a random sample.
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Janella
2 months ago
20% is a good sample size. Wouldn't want to go overboard and sample the whole table, that's just showing off.
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Rolande
2 months ago
The sampling function should definitely take the data by blocks of rows. Anything else would just be weird.
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Janna
2 months ago
I definitely remember that the sample should be non-repeatable, so we might need to use a different approach than just a simple SELECT statement.
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Lilli
2 months ago
I feel like the command should include something like "TABLESAMPLE SYSTEM (20)" but I can't recall the exact syntax.
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Alyce
3 months ago
I remember practicing a question like this where we had to use a random sampling method. Maybe we can use TABLESAMPLE?
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Lenny
3 months ago
I think we need to use the SAMPLE clause, but I'm not sure how to specify the percentage correctly.
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Margart
4 months ago
Nice, the TABLESAMPLE clause is exactly what I was thinking. I'll make sure to specify the SYSTEM option to get the non-repeatable sample.
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Trinidad
4 months ago
I'm going to try using the TABLESAMPLE clause with the BERNOULLI method. That should give me a 20% sample without repeating.
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Nan
4 months ago
I'm a bit confused on the "not repeatable" part. Does that mean I can't use a random sampling function?
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Chantell
4 months ago
Okay, I think I know how to do this. I'll need to use a sampling function that takes the data by blocks of rows.
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Aliza
4 months ago
Hmm, this looks like a tricky one. I'll need to think carefully about how to approach this.
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