Question

CREATE TABLE "Employer" (
        "employerID" INT PRIMARY KEY NOT NULL,
        "name" CHAR,
        "industry" CHAR,
        "contact1" CHAR,
        "contact2" CHAR,
        "email" CHAR,
        "website" CHAR,
        "facts" CHAR,
        "phone" VACHAR
        )

CREATE TABLE "Job" (
        "jobID" INT PRIMARY KEY NOT NULL,
        "employerID" INT,
        "title" CHAR,
        "description" CHAR,
        "type" CHAR,
        "salary" CHAR,
        "benefits" CHAR,
        "vacancies" INT,
        "closing" CHAR,
        "requirement" CHAR,
        "placement" BOOL,
        "applyTo" CHAR,
        "notes" CHAR,
        FOREIGN KEY (employerID) REFERENCES Employer(employerID)
        )

I am looking get values from database and set them to JLabel text, but I am not sure about the sql statement when foreign keys are involved. The SQL Statement should be to SELECT all values from Job table except employerID and use the foreign key employerID to obtain the name of a company…can anoyone show me the correct sql statement for this..i would like to display information like this example:

ANALYST – MICROSOFT

JobID: 4545454
Description: Good job
email: [e-mail]
phone: 45545

but not sure how to display MICROSOFT

public void setText() {
    try {
    String sql = "SELECT a.*, b.name FROM Employer a INNER JOIN `Job` b ON a.employerID = b.employerID";
    pst = conn.prepareStatement(sql); 
    rs = pst.executeQuery();
    while (rs.next()) {

        System.out.println(rs.getString(1)); //how Do i Print the name value from Employer table?? 
        System.out.println(rs.getString(2));
        System.out.println(rs.getString(3));
        System.out.println(rs.getString(4));
        System.out.println(rs.getString(5));
        System.out.println(rs.getString(6)); 
    }


}

How to print the name value from EMployer table as well as all data from Job table??

Answer 1

A simple join might do the job.

SELECT  a.*, b.*       // -- SELECT the columns you want to display
                       // -- eg b.Title
FROM    Employer a
        INNER JOIN `Job` b
            ON a.EmployerID = b.EmployerID