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

Show the number of transactions with transaction type code 'SALE' for different investors if it is larger than 0 in a scatter chart
SELECT investor_id, COUNT(*) FROM Transactions WHERE transaction_type_code = "SALE" GROUP BY investor_id
SELECT "investor_id", COUNT(*) FROM "Transactions" WHERE "SALE" = "transaction_type_code" GROUP BY "investor_id"