CREATE TABLE table_17115950_2 (date_of_vacancy VARCHAR, replaced_by VARCHAR)

How many times did Viorel Moldovan replaced a manager?
SELECT COUNT(date_of_vacancy) FROM table_17115950_2 WHERE replaced_by = "Viorel Moldovan"
SELECT COUNT("date_of_vacancy") FROM "table_17115950_2" WHERE "Viorel Moldovan" = "replaced_by"