Update query with join between two tables alternative since Postresql does not support join in update query.

update <SCHEMA_NAME>.<TABLE_NAME_1> AS A
SET <COLUMN_1> = True       
FROM <SCHEMA_NAME>.<TABLE_NAME_2> AS B 
WHERE 
    A.<COLUMN_2> = B.<COLUMN_2> AND
    A.<COLUMN_3> = B.<COLUMN_3>