Multiple choice technology databases

In the Table employee_Details there are two columns: Employee_Id-Integer[10] and Employee_Name-Char[10],The following select query Select distinct(Employee_Name) from employee_Details where Employee_Id='1232' fails due to:

  1. The field mentioned in the where clause should be one of the columns selected

  2. The distinct function can not be used on a field of type Char

  3. The Integer value mentioned in the where clause should not be enclosed by quotes since it is of integer type.

  4. none of the above.
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C Correct answer
Explanation

In SQL, when a WHERE clause filters on an INTEGER column, the comparison value must not be enclosed in quotes. The query WHERE Employee_Id='1232' treats '1232' as a string literal, which may cause type mismatch errors or implicit conversion issues depending on the database system. The correct syntax is WHERE Employee_Id=1232.

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