A crosstab query is a type of select query. ... When you create a crosstab query, you specify which fields contain row headings, which field contains column headings, and which field contains values to summarize. You can use only one field each when you specify column headings and values to summarize.
The sheave wheel is a pulley wheel that sits above the mine shaft. The hoist cable passes over the sheave wheel and then down the shaft of the mine. (copied from google)
