CREATE TABLE payment (payment_date VARCHAR, staff_id VARCHAR)
CREATE TABLE staff (staff_id VARCHAR, first_name VARCHAR)

Find all the payment dates for the payments with an amount larger than 10 and the payments handled by a staff person with the first name Elsa.
SELECT payment_date FROM payment WHERE amount > 10 UNION SELECT T1.payment_date FROM payment AS T1 JOIN staff AS T2 ON T1.staff_id = T2.staff_id WHERE T2.first_name = 'Elsa'
SELECT "payment_date" FROM "payment" WHERE "amount" > 10 UNION SELECT "T1"."payment_date" FROM "payment" AS "T1" JOIN "staff" AS "T2" ON "T1"."staff_id" = "T2"."staff_id" AND "T2"."first_name" = 'Elsa'