CREATE TABLE table_name_90 (weight__kg_ INT, birthdate VARCHAR)

What is that if the weight for the play born on June 2, 1983?
SELECT SUM(weight__kg_) FROM table_name_90 WHERE birthdate = "june 2, 1983"
SELECT SUM("weight__kg_") FROM "table_name_90" WHERE "birthdate" = "june 2, 1983"