Which of the following SQL functions does not belong to the Math functions category ?

1. POWER()
2. ROUND()
3. LENGTH()
4. MOD()

Which of the following is not a valid aggregate function in MYSQL ?

1. COUNT()
2. SUM()
3. MAX()
4. LEN()

What will be returned by the given query ?

SELECT INSTR("INDIA", "DI");

1. 2
2. 3
3. -2
4. -3

If the substring is not present in a string, the INSTR() returns:

1. -1
2. 1
3. NULL
4. 0