Select the correct answerAnswer the correct and legal expression in SQL?OptionsSELECT NAME FROM STUDENT_DATA;SELECT NULL FROM STUDENT_DATA;SELECT * FROM STUDENT_DATA WHEN SNAME = NULL;SELECT # FROM STUDENT_DATA;
Question
Select the correct answerAnswer the correct and legal expression in SQL?OptionsSELECT NAME FROM STUDENT_DATA;SELECT NULL FROM STUDENT_DATA;SELECT * FROM STUDENT_DATA WHEN SNAME = NULL;SELECT # FROM STUDENT_DATA;
Solution
To select the correct and legal expression in SQL, we need to analyze each option:
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SELECT NAME FROM STUDENT_DATA; This is a valid SQL expression that selects the "NAME" column from the "STUDENT_DATA" table.
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SELECT NULL FROM STUDENT_DATA; This is also a valid SQL expression. It selects the NULL value from the "STUDENT_DATA" table. However, it may not be very useful in practice.
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SELECT * FROM STUDENT_DATA WHEN SNAME = NULL; This expression is not valid in SQL. The correct syntax would be "WHERE" instead of "WHEN" to specify a condition. Additionally, you cannot compare a column with NULL using the "=" operator. The correct way to check for NULL values is by using "IS NULL".
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SELECT # FROM STUDENT_DATA; This expression is not valid in SQL. The "#" symbol is not recognized as a valid column name or operator in SQL.
Therefore, the correct and legal expression in SQL is: SELECT NAME FROM STUDENT_DATA;
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