You are given a programming problem and its implementation. Analyze the problem and implementation and explain the algorithm and approach used to solve the problem. Table: Person | Column Name | Type | | personId | int | | lastName | varchar | | firstName | varchar | personId is the primary key column for this table. This table contains information about the ID of some persons and their first and last names. Table: Address | Column Name | Type | | addressId | int | | personId | int | | city | varchar| | state | varchar | addressId is the primary key column for this table. Each row of this table contains information about the city and state of one person with ID = PersonId. Write an SQL query to report the first name, last name, city, and state of each person in the Person table. If the address of a personId is not present in the Address table, report null instead. Return the result table in any order. Implementation: select FirstName, LastName, City, State from Person left join Address on Person.PersonId = Address.PersonId ;

The given SQL query is used to report the first name , last name , city , and state of each person in the Person table . The query uses a left join to join the Person table with the Address table on the Person Id column . The columns that need to be reported are selected from both tables using the select statement . \n \n The left join is used to include all rows from the Person table , and only include rows from the Address table where there is a match on the Person Id column . This ens ures that if a person does not have an address , the city and state columns will be null in the result set . \n \n The result set will include all rows from the Person table , and only the matching rows from the Address table . If a person does not have an address , the city and state columns will be null . \n \n The query is efficient and will return the result table in any order . The use of the left join ens ures that all rows from the Person table are included in the result set , even if there is no matching row in the Address table . </s>