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Troubleshooting Question

What internal value did Oracle Database store?

deleyd asked
Last Modified: 2021-03-28
I have an Oracle database. A column "mycolumn" is defined as 'Number' format. I run Oracle SQL Developer (version, run a SQL statement to insert some data:

INSERT INTO mytable (mycolumn) VALUES (8.321)

Still using Oracle SQL Developer, I look at the result in the table, and it shows the value "8.321" in the cell. So far so good.

Then I write a C# program to retrieve the value of that cell:
OracleCommand cmd = new OracleCommand();
cmd.Connection = OConnection;
cmd.CommandText = "SELECT * FROM mytable";
OracleDataReader rdr = cmd.ExecuteReader();
while (rdr.Read())
    int x = rdr.GetOrdinal("MYCOLUMN");
    Decimal y = rdr.GetDecimal(x);
This works and I retrieve the value in y, which is "8.3210"

My question is, where did the trailing zero come from? Why is Decimal y not "8.321"? Why is there a trailing zero in the result?
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