assignment 2 added

Assignment2/assignment2.sql

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+create index idx_batter_counts on baseball.batter_counts(game_id);
+create index idx_game on baseball.game(game_id);
+
+--note: commented out after code buddy reviewed this
+---create table baseball.results (batter numeric, annual_batting_average double PRECISION, historic_batting_average double precision, rolling_batting_average double PRECISION);
+
+Question 1
+
+annual
+create table baseball.annual_batting_average (select batter, batting_average from(
+select btc.batter, sum(btc.hit)/sum(btc.atBat) as batting_average, extract(YEAR from gm.local_date) as year
+from baseball.batter_counts btc
+left join baseball.game gm
+on btc.game_id = gm.game_id
+group by (btc.batter), year
+having sum(btc.atBat) > 0
+order by (btc.batter), year) as aa)
+
+
+total
+create table baseball.total_batting_average (select batter, sum(hit)/sum(atBat) as batting_average
+from baseball.batter_counts
+group by batter
+having sum(atBat) >0);
+
+
+Question 2
+
+create table baseball.rolling_batting_average (with t1 as (select btc.batter, max(gm.local_date) as max from baseball.batter_counts btc
+left join baseball.game gm
+on btc.game_id = gm.game_id
+group by btc.batter),
+t2 as (select btc.batter, sum(btc.hit)/sum(btc.atBat) as batting_average, gm.local_date
+from baseball.batter_counts btc
+left join baseball.game gm
+on btc.game_id = gm.game_id
+group by btc.batter, btc.game_id
+having sum(btc.atBat)>0)
+select t2.batter , avg(t2.batting_average)  from t2
+right join t1 on t2.batter = t1.batter
+where t2.local_date > date_add(t1.max, INTERVAL -100 DAY)
+group by t1.batter);
+
+--Explanation about temporary tables:
+--I just created those since I thought we have to store the answers in a new table, but if not those tables are not needed and can simply be removed from the query
+
+drop table baseball.annual_batting_average;
+drop table baseball.total_batting_average;
+drop table baseball.rolling_batting_average;