Access a row type
When a row type (named or unnamed) is used as a column of a table, its fields can be accessed in exactly the same ways that the columns of a row are accessed.
That is, you create a series of nested loops that use the following
functions:
- The mi_next_row() function controls a loop that iterates through each retrieved row type.
- The mi_value() or mi_value_by_name() function controls a loop that iterates through each field value.