Suppose I have a table Foo with two columns: state, company_stock_symbol.
(There are other columns but let's ignore them.)
The states are relatively few (50). There are tens of thousands of companies.
* If I frequently do queries like this:
"SELECT * FROM Foo WHERE company_stock_symbol='bar' AND state='baz';"
what index should I use?
Should I use (company_stock_symbol), (state,company_stock_symbol), or
(company_stock_symbol,state)?
* Does the answer change if the query condition is reversed? Like so:
"SELECT * FROM Foo WHERE state='baz' AND company_stock_symbol='bar';"
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