Table: tallest_swiss_dams_2
Columns: name
canton
height_meters
crest_length_meters
type
year_of_construction
name_of_the_lake

Question: Tell me the total number of crest length for year construction larger than 1957 for mattmark
SQL: SELECT COUNT("crest_length_meters") FROM tallest_swiss_dams_2 WHERE "year_of_construction" > 1957 AND "name" = 'mattmark'

Question: Tell me the name of lake for crest length of 430
SQL: SELECT "name_of_the_lake" FROM tallest_swiss_dams_2 WHERE "crest_length_meters" = 430