Write SQL functions, which will perform the following operations. a) to display the day of the year for the given date in numeric format in the range 1 to 366.
b) to join strings "informatics" and " practices"
c) to display 5 characters from right side of the string "information".
d) to display the starting position of the substring 'city' from the string "green city".
e) to compute the square root of an integer.

Please answer this question fastly and appropriately please. I will mark you as brainlliest