Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_name_19 (date INTEGER, works_number VARCHAR, builder VARCHAR, number VARCHAR)

### Question ###
Which Date has a Builder of alco schenectady, and a Number larger than 835, and Works number of 56566?

### Accurate SQL ###

SELECT AVG(date) FROM table_name_19 WHERE builder = "alco schenectady" AND number > 835 AND works_number = 56566