What was the date of appointment for Christos Kassianos who belonged to AEK?
CREATE TABLE table_name_38 (date_of_appointment VARCHAR, team VARCHAR, replaced_by VARCHAR)
SELECT date_of_appointment FROM table_name_38 WHERE team = "aek" AND replaced_by = "christos kassianos"
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_name_38 (date_of_appointment VARCHAR, team VARCHAR, replaced_by VARCHAR) Question: What was the date of appointment for Christos Kassianos who belonged to AEK? [/INST] SELECT date_of_appointment FROM table_name_38 WHERE team = "aek" AND replaced_by = "christos kassianos" </s>