Connecting to a data source

The ddcon command connects to a data source returning a connection handle, using the form:

   [ch=. ddcon 'dsn=jdata'
1

We have now connected to a data source, but not yet to a data file. The file we will use is tdata, and the next statement uses ddcol to retrieve the column names and attributes for this file:

   $cols=. 'tdata' ddcol ch
7 13

   3 4 7 {"1 cols
+------+----+---------+
|Column|Type|Type_Name|
+------+----+---------+
|NAME  |1   |CHAR     |
+------+----+---------+
|SEX   |1   |CHAR     |
+------+----+---------+
|DEPT  |1   |CHAR     |
+------+----+---------+
...