1. Which of the following query is correct for using comparison operators in SQL?A) SELECT sname, coursename FROM studentinfo WHERE age>50 and <80;B) SELECT sname, coursename FROM studentinfo WHERE age>50 and age <80;C) SELECT sname, coursename FROM studentinfo WHERE age>50 and WHERE age<80;D) None of the above2.How to select...[ أكمل القراءه ]