select * from table_1 where username like ＇%yue%＇;会进行全表扫描。

A. >>>

B. [ ]

C. (

D. )

A. 数据分箱

B. 调整学习率

C. 数据聚类

D. 人工检查

A. for中还有for

B. while中还有 while

C. for中有while

D. while中有for

A. if a >= 22:

B. if a >= 22

C. if (a >= 22)

D. if (a => 22)

A. a[1:4]

B. a*2

C. "h" in a

D. a + b

A. GDS

B. 数据集市

C. BDS

D. ODS

A. delete from tb_name

B. delete from sample.tb_name

C. drop table tb_name

D. drop * from sample.tb_name

A. SELECT a FROM t2;

B. SELECT DISTINCT a FROM t2;

C. SELECT a,count(*) FROM t2 group by a;

D. SELECT a,b,count(*) FROM t2 group by a,b;

A. 历史表

B. 切片表

C. 明细表

D. 拉链表