To answer this question, let's understand the concept of UNIQUE KEY constraint and the behavior of SYSDATE.

A UNIQUE KEY constraint ensures that the values in a column or a group of columns are unique. It prevents duplicate values from being inserted into the column(s) that the constraint is defined on.

SYSDATE is a function in SQL that returns the current date and time. When you use SYSDATE in an INSERT statement, it will insert the current date and time into the specified column.

Based on this information, if a UNIQUE KEY constraint is created on a DATE column and you try to insert rows with SYSDATE, the constraint will not accept the rows. This is because each new row will have a different date and time value, which violates the uniqueness constraint.

Therefore, the correct answer is:

Option B) won't - This option is correct because when a UNIQUE KEY constraint is created on a DATE column, it will not accept rows that are inserted with SYSDATE.

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To answer this question, let's go through each option to understand why it is correct or incorrect:

Option A) 50 - This option is incorrect because the value of 'a' will not be multiplied by 'c' since the condition in the if statement is not satisfied.

Option B) NULL - This option is incorrect because the value of 'a' is initially 5 and it will not be set to NULL in the given code.

Option C) 5 - This option is correct because the condition in the if statement is satisfied (a > b and a < c), so the value of 'a' will be updated to the product of 'c' and 'a', which is 10 * 5 = 50. Therefore, the value of 'a' will be 5 after execution.

Option D) None of the above - This option is incorrect because the correct answer is option C, as explained above.

The correct answer is C. The value of 'a' will be 5 after execution.

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• Wrong explanation

To answer this question, we need to understand the concept of synonyms.

Synonyms are words that have similar meanings. In databases, synonyms are used to provide alternative names for database objects, such as tables, views, or procedures.

Now, let's go through each option to understand why it is correct or incorrect:

Option A) True - This option is correct because we can rename a synonym. In databases, you can use the ALTER SYNONYM statement to rename a synonym. This allows you to change the name of the synonym without affecting the underlying object it refers to.

Option B) False - This option is incorrect. As mentioned above, we can rename a synonym in databases.

The correct answer is A) True. This option is correct because we can indeed rename a synonym using the ALTER SYNONYM statement.

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• Wrong explanation