Using SQLite make a query using:

Survey:

CREATE TABLE Person (id text, personal text, family text);

CREATE TABLE Site (name text, lat real, long real);

CREATE TABLE Survey (taken integer, person text, quant text, reading real);

CREATE TABLE Visited (id integer, site text, dated text);

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2. where you are aggregating data using group by with multiple groups. (This can use concepts from Selecting Data, Combining Data, Aggregation, Calculating New Values, Sorting or Removing Duplicates, or Filtering)

(So long as you use group by, there are no restrictions on how to write it)