r - RODBC sqlSave column types: how determined? -

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I am trying to understand how RODBC determines the column type of a newly created (Access) table? The R documentation for SqlSave is very confidential: "Types are sorted by selection in preferences and type configurations". And there is no example for this argument. Where can I find a better explanation? There is no need to see the sources instead of "getSqlTypeInfo (driver)". 

  & gt; "Worker (255)" $ logical [1] "Attitudes (5)" & gt; GetSqlTypeInfo ("ACCESS") $ double [1] "double" $ integer [1] "article" $ character [1]

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