单选题A view is created with the following statement:CREATE VIEW v1 AS SELECT col1, col2, col3 FROM t1 WHERE col4 > 1000 ; When will DB2 access the data from table T1 for view V1?（）A When view V1 is createdB Each time the REFRESH VIEW v1 statement is execute

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单选题

A view is created with the following statement:CREATE VIEW v1 AS SELECT col1, col2, col3 FROM t1 WHERE col4 > 1000 ; When will DB2 access the data from table T1 for view V1?（）

When view V1 is created

Each time the REFRESH VIEW v1 statement is executed

Each time an SQL statement is executed against view V1

Only the first time an SQL statement is executed against view V1

更多“单选题A view is created with the following statement:CREATE VIEW v1 AS SELECT col1, col2, col3 FROM t1 WHERE col4 1000 ; When will DB2 access the data from table T1 for view V1?（）A When view V1 is createdB Each time the REFRESH VIEW v1 statement is executed”相关问题

第1题

设有关系模式商品（商品号，商品名称，单价，数量，类别），建立统计每类商品总数量的视图的正确语句是（）A、CREATE VIEW v1AS SELECT类别，SUM（数量）FROM商品GROUP BY类别B、CREATE VIEW v1AS SELECT类别，COUNT（数量）FROM商品GROUP BY类别C、CREATE VIEW v1（类别，总数量）AS SELECT类别，SUM（数量）FROM商品GROUP BY类别D、CREATE VIEW v1（类别，总数量）AS SELECT类别，COUNT（数量）FROM商品GROU PBY类别

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第2题

有关系模式：学生表（学号，姓名，所在系），建立统计每个系的学生人数的视图的正确语句是（）A、CREATE VIEW v1AS SELECT所在系，COUNT（*）FROM学生表GROUP BY所在系B、CREATE VIEW v1AS SELECT所在系，SUM（*）FROM学生表GROUP BY所在系C、CREATE VIEW v1（系名，人数）AS SELECT所在系，SUM（*）FROM学生表GROUP BY所在系D、CREATE VIEW v1（系名，人数）AS ELECT所在系，COUNT（*）FROM学生表GROUP BY所在系

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第3题

A DBA has been asked to create a table which will contain a substantial amount of detailed sales information for each calendar month and maintain it to contain only the last 12 months. Which of the following methods will facilitate the online removal of the oldest month’s data?（）A、Create an MQT that selects the oldest month of data with the REFRESH IMMEDIATE option.B、Create 12 separate tables, create a view based on all 12, drop the table with the oldest month's data then drop and re- create the view.C、Create a range partitioned table, partitioned by month, and use the ALTER TABLE statement to detach the oldest month and attach storage for new data.D、Create a single table, extract the data to be retained using UNLOAD with a SELECT statement, drop and re-create the table then load only the data to be retained.

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第4题

You need to create a view EMP_VU. The view should allow the users to manipulate the records of only the employees that are working for departments 10 or 20.Which SQL statement would you use to create the view EMP_VU?（）A、CREATE VIEW emp_vu AS SELECT * FROM employees WHERE department_id IN (10,20);B、CREATE VIEW emp_vu AS SELECT * FROM employees WHERE department_id IN (10,20) WITH READ ONLY;C、CREATE VIEW emp_vu AS SELECT * FROM employees WHERE department_id IN (10,20) WITH CHECK OPTION;D、CREATE FORCE VIEW emp_vu AS SELECT * FROM employees WHERE department_id IN (10,20);E、CREATE FORCE VIEW emp_vu AS SELECT * FROM employees WHERE department_id IN (10,20) NO UPDATE;

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第5题

Examine the structure if the EMPLOYEES table: Column name Data Type Remarks EMPLOYEE_ID NUMBER NOT NULL, Primary Key EMP_NAME VARCHAR2(30) JOB_ID VARCHAR2(20) NOT NULL SAL NUMBER MGR_ID NUMBER References EMPLOYEE_ID column DEPARTMENT_ID NUMBER Foreign key to DEPARTMENT_ID column of the DEPARTMENTS table You need to create a view called EMP_VU that allows the user to insert rows through the view. Which SQL statement, when used to create the EMP_VU view, allows the user to insert rows? （）A、CREATE VIEW emp_Vu AS SELECT employee_id, emp_name, department_id FROM employees WHERE mgr_id IN (102, 120);B、CREATE VIEW emp_Vu AS SELECT employee_id, emp_name, job_id department_id FROM employees WHERE mgr_id IN (102, 120);C、CREATE VIEW emp_Vu AS SELECT department_id, SUM(sal) TOTALSAL FROM employees WHERE mgr_id IN (102, 120) GROUP BY department_ id;D、CREATE VIEW emp_Vu AS SELECT employee_id, emp_name, job_id, DISTINCT department_id FROM employees;

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第6题

The HR user creates a view with this command： SQL> CREATE VIEW emp_v AS SELECT * FROM scott.emp； Now HR wants to grant the SELECT privilege on the EMP_V view to the JIM user. Which statement is true in this scenario？（）A、HR can grant the privilege to JIM but without GRANT OPTION.B、HR can grant the privilege to JIM because HR is the owner of the view.C、SCOTT has to grant the SELECT privilege on the EMP table to JIM before this operation.D、HR needs the SELECT privilege on the EMP table with GRANT OPTION from SCOTT for this operation.

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第7题

Which two statements about views are true?（）A、A view can be created as read only.B、A view can be created as a join on two or more tables.C、A view cannot have an ORDER BY clause in the SELECT statement.D、A view cannot be created with a GROUP BY clause in the SELECT statement.E、A view must have aliases defined for the column names in the SELECT statement.

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单选题A view is created with the following statement:CREATE VIEW v1 AS SELECT col1, col2, col3 FROM t1 WHERE col4 1000 ; When will DB2 access the data from table T1 for view V1?（）A When view V1 is createdB Each time the REFRESH VIEW v1 statement is executed

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更多“单选题A view is created with the following statement:CREATE VIEW v1 AS SELECT col1, col2, col3 FROM t1 WHERE col4 1000 ; When will DB2 access the data from table T1 for view V1?（）A When view V1 is createdB Each time the REFRESH VIEW v1 statement is executed”相关问题

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