PHP - Php mostrar tabla relacionada y permitir edición

CREATE DATABASE IF NOT EXISTS testdb;

USE testdb;

CREATE TABLE IF NOT EXISTS tbl_users (

  userID int(11) NOT NULL AUTO_INCREMENT,

  userName varchar(20) NOT NULL,

  userProfession varchar(50) NOT NULL,

  userPic varchar(200) NOT NULL,

  dni varchar(200)DEFAULT '12345678',

  telefono varchar(200)DEFAULT '900150503',

  PRIMARY KEY (userID)

) ENGINE=INNODB;

CREATE DATABASE IF NOT EXISTS testdb;

USE testdb;

CREATE TABLE IF NOT EXISTS tbl_trabajos (

workID int(11) NOT NULL AUTO_INCREMENT,

userID int(11) NOT NULL,

fechatrabajo TIMESTAMP DEFAULT CURRENT_TIMESTAMP,

incidencias varchar(50) NOT NULL,

notas varchar(50),

firma varchar(200) NOT NULL,

    PRIMARY KEY (workID),

    FOREIGN KEY (userID) REFERENCES tbl_users(userID)

) ENGINE=INNODB;