Predict the output of the following query:SELECT MOD (9,0);i. 0ii. NULLiii. NaNiv. 91

Problem Breakdown

1. The query uses the MOD function, which calculates the modulus (remainder) of the division of two numbers.
2. The numbers used in this query are 9 (the dividend) and 0 (the divisor).
3. It is essential to identify how the SQL database handles modulus division by zero.

Relevant Concepts

1. The MOD function is defined as follows: $\text{MOD}(a, b) = a - b \cdot \left\lfloor \frac{a}{b} \right\rfloor$
2. Division by zero is undefined in mathematics. This results in an error or a special output depending on the database system.

Analysis and Detail

1. In SQL, attempting to divide by zero typically results in an error or a special value.
2. The standard behavior in many databases (like MySQL, PostgreSQL) returns NULL or raises an exception when trying to execute MOD(9, 0) because it's an invalid operation.

Verify and Summarize

• Given that MOD function encounters division by zero, we can conclude the likely outputs for standard SQL implementations.

Final Answer

The output of the query SELECT MOD(9,0); will be ii. NULL.