What is the expected result?
Consider the following SQL query:
SELECT product_id FROM supplier_A
UNION
SELECT product_id FROM supplier_B;
What is the expected result?
A . All product_id values from both tables with duplicates or repeating rows
B . All product_id values from supplier_A table but not from supplier_B table
C . All product_id values from supplier_B table but not from supplier_A table
D . All product_id values from both tables with no duplicates or repeating rows
Answer: D
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