provides the possibility to find columns by their name.
When several columns have the same name, then the value
of the first matching column will be returned. The column name option is
designed to be used when column names are used in the SQL
query. For columns that are NOT explicitly named in the query, it
is best to use column numbers. If column names are used, there is
no way for the programmer to guarantee that they actually refer to
the intended columns.
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