CREATE TABLE PURCHASES (purchase_details VARCHAR, purchase_transaction_id VARCHAR)
CREATE TABLE TRANSACTIONS (transaction_id VARCHAR, amount_of_transaction INT)

What are the purchase details of transactions with amount bigger than 10000?
SELECT T1.purchase_details FROM PURCHASES AS T1 JOIN TRANSACTIONS AS T2 ON T1.purchase_transaction_id = T2.transaction_id WHERE T2.amount_of_transaction > 10000
SELECT "T1"."purchase_details" FROM "PURCHASES" AS "T1" JOIN "TRANSACTIONS" AS "T2" ON "T1"."purchase_transaction_id" = "T2"."transaction_id" AND "T2"."amount_of_transaction" > 10000