A、 SELECT cust_name FROM Customers1 UNION SELECT cust_name FROM Customers2
B、 SELECT cust_contact FROM Customers1 UNION SELECT cust_name, cust_contact FROM Customers2
C、 SELECT * FROM Customers1 UNION SELECT * FROM Customers2
D、 SELECT cust_name FROM Customers1 UNION SELECT * FROM Customers2
答案:AC
A、 SELECT cust_name FROM Customers1 UNION SELECT cust_name FROM Customers2
B、 SELECT cust_contact FROM Customers1 UNION SELECT cust_name, cust_contact FROM Customers2
C、 SELECT * FROM Customers1 UNION SELECT * FROM Customers2
D、 SELECT cust_name FROM Customers1 UNION SELECT * FROM Customers2
答案:AC
A. 持续提升数据质 量
B. 确保信息数据合 法合规
C. 促进数据应用价 值的充分发挥
D. 直接创造利润
A. Woody的放大镜
B. 数据资产视图
C. show create table命令
D. 数据服务目录
A. create
B. drop
C. alter
D. rename
A. A.mean
B. B.quantile
C. C.count
D. D.prod
解析:本题考查聚合函数用法
A. 银行汇票
B. 商业汇票
C. 银行本票
D. 支票
A. 移动(move)
B. 复制(copy)
C. 拆分(split)
D. 删除(delete)
A. DCRM
B. DAMP
C. PSCV
D. ACRM
A. 短期贷款
B. 信用贷款
C. 担保贷款
D. 中长期贷款