Data Set对象的Merge方法用于()
A.将两个Data Set中的数据和架构合并到一个Data Set中
B.将两个Data Table中的行合并到一个Data Table中
C.向数据源提交修改
D.从数据源提取数据
A.将两个Data Set中的数据和架构合并到一个Data Set中
B.将两个Data Table中的行合并到一个Data Table中
C.向数据源提交修改
D.从数据源提取数据
第1题
A、DATA语句
B、SET语句
C、RUN语句
D、MERGE语句
E、INFILE语句
第2题
A. It executes successfully, and the transition point is set to ‘1-apr-2006‘.
B. It executes successfully, and the transition point is set to ‘15-apr-2006‘.
C. It produces an error because the partitions specified for merging are not adjacent.
D. It produces an error because the date values specified in the merge do not match the date values stored in the table.
第4题
A. UPDATE emp_hist SET employee_id, name, job_id, salary = (SELECT employee_id, name, job_id, salary FROM employees) WHERE employee_id IN (SELECT employee_id FROM employees);
B. MERGE INTO emp_hist eh USING employees e ON (eh.employee_id = e.employee_id) WHEN MATCHED THEN UPDATE SET eh.name = e.name, eh.job_id = e.job_id, eh.salary = e.salary WHEN NOT MATCHED THEN INSERT VALUES (e.employee id, e.name, job id, e.salary);
C. MERGE INTO emp_hist eh USING employees e ON (eh.employee_id = e.employee_id) WHEN MATCHED THEN UPDATE emp hist SET eh.name = e.name, eh.job_id = e.job_id, eh.salary = e.salary WHEN NOT MATCHED THEN INSERT INTO emp_hist VALUES (e.employees_id, e.name, e.job_id, e.salary);
D. MERGE INTO emp_hist eh USING employees e WHEN MATCHED THEN UPDATE emp_hist SET eh.name = e.name, eh.job_id = e.job_id, eh.salary = e.salary WHEN NOT MATCHED THEN INSERT INTO emp_hist VALUES (e.employees_id, e.name, e.job_id, e.salary);
第5题
A.可以理解成在目标对象之前,架设一层“拦截”
B.Proxy的get方法用于拦截某个属性的读取操作
C.Proxy的set方法用于拦截对对象的写操作
D.一旦对象设置Proxy代理后不可取消,所以要谨慎操作
第7题
第8题
A.how=right
B.how=left
C.how=inner
D.how=outer
第9题
A.how=right
B.how=left
C.how=inner
D.how=outer
第10题
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