CREATE TABLE Purchases (purchase_transaction_id NUMBER, purchase_details VARCHAR2)
CREATE TABLE Lots (lot_id NUMBER, investor_id NUMBER, lot_details VARCHAR2)
CREATE TABLE Transactions (transaction_id NUMBER, investor_id NUMBER, transaction_type_code VARCHAR2, date_of_transaction DATETIME, amount_of_transaction NUMBER, share_count VARCHAR2, other_details VARCHAR2)
CREATE TABLE Sales (sales_transaction_id NUMBER, sales_details VARCHAR2)
CREATE TABLE Transactions_Lots (transaction_id NUMBER, lot_id NUMBER)
CREATE TABLE Ref_Transaction_Types (transaction_type_code VARCHAR2, transaction_type_description VARCHAR2)
CREATE TABLE Investors (investor_id NUMBER, Investor_details VARCHAR2)

For the dates of transactions with amount smaller than 3000, bin the date into year interval, and draw a line chart to show the trend of the number of records in each bin.
SELECT date_of_transaction, COUNT(date_of_transaction) FROM Sales AS T1 JOIN Transactions AS T2 ON T1.sales_transaction_id = T2.transaction_id WHERE T2.amount_of_transaction < 3000
SELECT "date_of_transaction", COUNT("date_of_transaction") FROM "Sales" "T1" JOIN "Transactions" "T2" ON "T1"."sales_transaction_id" = "T2"."transaction_id" AND "T2"."amount_of_transaction" < 3000