Chapter 6, Problem 2MC

Which of the following Semigroup instances are lawful?   Please show the solution for each option.

Does third normal form prohibit transitive dependencies on the primary key and/or prohibit partial dependencies on the primary key? Thank you!

Any comments i could add to this? package attendance; import java.sql.Connection;import java.sql.DriverManager;import java.sql.SQLException;import java.sql.Statement; public class SqliteDB {Connection conn = null;Statement stmt = null;public SqliteDB() throws ClassNotFoundException {//try to connect with dbtry {Class.forName("org.sqlite.JDBC");// db parametersString url = "jdbc:sqlite:C:/sqlite/db/attendance.db";// create a connection to the databaseconn = DriverManager.getConnection(url);System.out.println("Connection to SQLite has been established.");} catch (SQLException e) {System.out.println(e.getMessage());}}public void executeQuery(String query) {try {this.stmt = conn.createStatement();stmt.execute(query);}catch (Exception e) {System.out.println(e);}}public void closeConnection() {try {this.conn.close();}catch( Exception e) {System.out.println(e);}}}

When we say "triggers," what precisely do we mean? But what are their actual functions? By following these easy instructions, you may harness the power of a trigger in Access 2016.

Write a PHP application that creates a class that allows connection to a specific MySQL database, allowing the specification (by setting some properties) of the location server, user, password, and database name. Give a example of instantiating it (creating an object) and using it in an application with a MySQL table

Does second normal form prohibit transitive dependencies on the primary key and/or prohibit partial dependencies on the primary key? Thank you!

Which of the following types of restrictions can be viewed with the DESCRIBE command? NOT NULL FOREIGN KEY UNIQUE CHECK