1z0-071 Exam Dumps | Which three queries use valid expressions?

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Question 72/144

Which three queries use valid expressions?

A. SELECT product_id,(unit_price * 0.15 / (4.75 + 552.25)) FROM products;

B. SELECT product_id,(expiry_date - delivery_date) * 2 FROM products;

C. SELECT product_id,unit_price || 5 "Discount" , unit_price + surcharge - discount FROM products;

D. SELECT product_id, expiry_date * 2 from products;

E. SELECT product_id,unit_price,5 "Discount", unit_price + surcharge-discount FROM products;

F. SELECT product_id, unit_price, unit_price + surcharge FROM products;

Correct Answer: A,B,F

When evaluating whether expressions in SQL queries are valid, consider data type compatibility and the operations performed:
Option A: Valid. The expression performs arithmetic operations (multiplication and division) on numeric data types (unit_price, constants). These operations are allowed and make sense in a mathematical context.
Option B: Valid. This query calculates the difference between two dates (expiry_date and delivery_date), which results in a numeric value representing the number of days between the dates. The result is then multiplied by 2, which is a valid operation on a numeric result.
Option C: Invalid. The expression unit_price || 5 attempts to concatenate a numeric value with a number, which is not valid without explicit conversion to a string. Moreover, the use of quotes around "Discount" is syntactically incorrect in this context.
Option D: Invalid. The expression expiry_date * 2 attempts to multiply a DATE datatype by a numeric value, which is not a valid operation.
Option E: Invalid. Similar to Option C, it incorrectly attempts to concatenate a number directly with a numeric value without conversion. Additionally, the aliasing with quotes is incorrectly placed.
Option F: Valid. This query simply adds two numeric columns (unit_price and surcharge), which is a valid and commonly used arithmetic operation in SQL.

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