Write SQL statements for following given Employee table:

$\backslash$table$[[$Column$,$Type,Key,Extra$],[$Emp$\_$Id$,$NO$,$PRI,$],[$Emp$\_$Name,NO$,,],[$Age$,$YES,,Age must be$],[$City$,$YES,,$],[$JobTitle$,$YES,,$]]$

Write a SQL statement to create above table with appropriate datatype and with the mentioned constraints. $(3)$

Write a SQL statement to add a new column "State" of datatype varchar with size $20$ to the table Employee. $(1)$

Write a SQL query to "Display employee id$,$ employee name whose third letter $"g"$ and are at least $4$ characters in length" from the Employee table". $(1)$

Write a SQL query to "Display employee details who are working as an "Instructor" in "Toronto". $(1)$

Write a SQL query to "Delete Age column from Employee table". $(1)$

Write a SQL query to "Change City column size". $(1)$