数据分析挖掘中，对于聚类问题，可以使用什么算法？

A. 大数据服务目录

B. 业务需求说明书

C. XX项目数据需求

D. 模型说明书

A. WHERE

B. HAVING

C. LIMIT

D. GROUP BY

A. drop

B. change

C. modify

D. rename

A. 树

B. 图

C. 索引

D. 关系

A. select id from t where substring(name, 1,3)=＇abc＇

B. select id from t where name like ＇abc%＇

C. select id from t where num/2=100

D. select id from t where num=100*2

A. SELECT cust_id FROM Orders WHERE order_num IN (SELECT cust_id FROM OrderItems WHERE prod_id = ＇RGAN01＇);

B. SELECT cust_id FROM Orders WHERE order_num IN (SELECT order_num FROM OrderItems WHERE prod_id = ＇RGAN01＇);

C. SELECT * FROM Orders WHERE cust_id IN (SELECT cust_id FROM OrderItems WHERE prod_id = ＇RGAN01＇);

D. SELECT * FROM Orders WHERE cust_id IN (SELECT order_num FROM OrderItems WHERE prod_id = ＇RGAN01＇);

A. plot.hist()

B. plot.density()

C. plot.bar()

D. plot.barh()

A. if exists

B. exists

C. having

D. if existing