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Good day everyone please i am working on c# windowsform applicaton for loan i want to join two database base on a particular column. i have  two database(employement,loanform) please i want to join the two of them to a new table so there will not be duplicate colums)
database employementform(1st database)
 id          employementnumber      fullname      age      
1            ts/02/001               adedoyin     40
2            ts/02/003                chisom      25
3            ts/02/012                 femi       44
4            ts/02/022                 James      33
 
 
database loanform(2nd database)
id          employementnumber      amountofloan         percent         totalamount
1           ts/02/003                10000               10                100000
2           ts/02/003               2500                 10                 2750
3            ts/02/01               1200                 10               1320
 
i want to join them on a new database to show on a datagridview and i want it to be like this:
database join
 id     employementnumber fullname     age    amountofloan   percent  totalamount
 1      ts/02/003          adedoyin     40       10000           10     100000
2        ts/02/003        adedoyin      40        2500            10     2750
3        ts/02/01         chisom       25        1200            10     1320


What I have tried:

SqlConnection con = new SqlConnection(@"Data Source=(LocalDB)\MSSQLLocalDB;AttachDbFilename=C:\Users\odt\Documents\Loanapp.mdf;Integrated Security=True;Connect Timeout=30");
          DataTable dt = new DataTable();
          con.Open();
          SqlCommand cmd = con.CreateCommand();
          cmd.CommandType = CommandType.Text;
          cmd.CommandText = "select * from loanform,Registrationform";
          cmd.ExecuteNonQuery();

          SqlDataAdapter da = new SqlDataAdapter(cmd);
Posted
Updated 30-May-19 9:19am
v2

1 solution

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Solution 1

What you need is a JOIN: SQL Joins[^]
Something like:
SELECT a.id, a.Employmentnumber, b.fullname, b.age, a.amountofloan, a.percent, a.totalamount FROM loanform a
JOIN employmentform b ON a.employmentnumber = b.employmentnumber

But ... that's a poor bit of design you have there.
Instead of storing EmploymentNumber in each row of the loanform, store the ID from the employmentform as a foreign key, and instead of storing the age store the DOB - you can work out the age from that, but age changes, DOB doesn't.

And those aren't databases, they are tables within a database - it's very important to use the right terminology, or answers can be very, very wrong.
   

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