Statement.execute(sql) vs executeUpdate(sql) and executeQuery(sql)

Question

I have a question related to this method: st.execute(sql); where st obviously is a Statement object. Directly from this oracle java tutorial:

Answer 1

boolean execute(): Executes the SQL statement in this Prepared Statement object, which may be any kind of SQL statement.

ResultSet executeQuery(): Executes the SQL query in this Prepared Statement object and returns the ResultSet object generated by the query.

int executeUpdate(): Executes the SQL statement in this Prepared Statement object, which must be an SQL INSERT, UPDATE or DELETE statement; or an SQL statement that returns nothing, such as a DDL statement.

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