how can write sql query select latest recommendation each analyst each stock known on specific date (e.g. 1/1/10). example, if analyst has multiple ratings, max(rating_date) greater specified date, should still return rating @ max date less specified date. so, in case below @ specified date of 1/1/10, should still rating john of 6/9/09 value smith of 12/5/09.
here's data structure:
stock_ticker, analyst_name, rating_date, rating_name g, john, 6/9/09, hold g, john, 1/20/10, sell g, smith, 12/5/09, buy if try sql below, value if max date less specified date.
select analyst_ratings.stock_ticker, analyst_ratings.analyst_name, analyst_ratings.rating_name analyst_ratings rating_date in( select max(rating_date) analyst_ratings rating_date <= '2010-01-01')
select analyst_ratings.stock_ticker, analyst_ratings.analyst_name, analyst_ratings.rating_name analyst_ratings rating_date in( select max(rating_date) analyst_ratings group stock_ticker, analyst_name rating_date <= '2010-01-01') try this
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