Marvelous Data-Management-Foundations Learning Engine demonstrates high-effective Exam Materials - CramPDF
Marvelous Data-Management-Foundations Learning Engine demonstrates high-effective Exam Materials - CramPDF
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WGU Data Management – Foundations Exam Sample Questions (Q54-Q59):
NEW QUESTION # 54
Which statement uses valid syntax for the DELETE statement in SQL?
- A. DELETE table_name WHERE condition;
- B. DELETE FROM table_name WHERE condition;
- C. DELETE FROM table_name;
- D. DELETE * FROM table_name WHERE condition;
Answer: B
Explanation:
Thecorrect syntaxfor deleting records from a table in SQL is:
sql
DELETE FROM table_name WHERE condition;
This deletesonly the rowsthat match the condition.
Example Usage:
sql
DELETE FROM Employees WHERE Salary < 30000;
* Deletesall employees earning less than $30,000.
Why Other Options Are Incorrect:
* Option A (Incorrect):Missing FROMkeyword. The correct syntax is DELETE FROM table_name.
* Option C (Partially Correct):DELETE FROM table_name;deletes all rows, but it lacks a WHERE clause.
* Option D (Incorrect):DELETE *is not validin SQL. The correct command is just DELETE FROM.
Thus, the correct answer isDELETE FROM table_name WHERE condition;.
NEW QUESTION # 55
Which action does the % operator accomplish in MySQL?
- A. Subtracts a numeric value from another
- B. Divides two numeric values and returns the remainder
- C. Raises a numeric value to the power of another
- D. Compares two numeric values for equality
Answer: B
Explanation:
The % operator in MySQL is known as themodulus operator. It returns theremainderof a division operation between two numbers.
Example:
sql
SELECT 10 % 3; -- Output: 1 (10 divided by 3 gives remainder 1)
* Option A (Incorrect):Raising a number to a power is done using the POW() function or