ARA-C01 Question #87: Real Exam Question with Answer & Explanation

Question

A new table and streams are created with the following commands: CREATE OR REPLACE TABLE LETTERS (ID INT, LETTER STRING) ; CREATE OR REPLACE STREAM STREAM_1 ON TABLE LETTERS; CREATE OR REPLACE STREAM STREAM_2 ON TABLE LETTERS APPEND_ONLY = TRUE; The following operations are processed on the newly created table: INSERT INTO LETTERS VALUES (1, 'A'); INSERT INTO LETTERS VALUES (2, 'B'); INSERT INTO LETTERS VALUES (3, 'C'); TRUNCATE TABLE LETTERS; INSERT INTO LETTERS VALUES (4, 'D'); INSERT INTO LETTERS VALUES (5, 'E'); INSERT INTO LETTERS VALUES (6, 'F'); DELETE FROM LETTERS WHERE ID = 6; What would be the output of the following SQL commands, in order? SELECT COUNT (*) FROM STREAM_1; SELECT COUNT (*) FROM STREAM_2;

Options

• A2 & 6
• B2 & 3
• C4 & 3
• D4 & 6

Explanation

In Snowflake, a stream records data manipulation language (DML) changes to its base table since the stream was created or last consumed. STREAM_1 will show all changes including the TRUNCATE operation, while STREAM_2, being APPEND_ONLY, will not show deletions like TRUNCATE. Therefore, STREAM_1 will count the three inserts, the TRUNCATE (counted as a single operation), and the subsequent two inserts before the delete, totaling 4. STREAM_2 will only count the three initial inserts and the two after the TRUNCATE, totaling 3, as it does not count the TRUNCATE or the delete operation.

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