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A view is created with the following statement:CREATE VIEW v1 AS SELECT col1, col2, col3, col4 FROM t1 WHERE col4 > 1000 WITH CHECK OPTIONWhat is the effect of the CHECK OPTION clause?（）
- A、Any row inserted or updated through view V1 must meet the condition that col4 > 1000.
- B、From now on, any row inserted or updated in table T1 must meet the condition that col4 > 1000, but existing rows in the table are not checked.
- C、At view creation, DB2 will check the data in table T1, and if in any row doesn't meet the condition col4 > 1000, the view creation will be rejected.
- D、Any row inserted or updated through view V1 must meet the condition that col4 > 1000 and no row in table T1 can be updated such that col4 <= 1000, but new rows in the table can be inserted with col4 <= 1000.
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更多 “A view is created with the following statement:CREATE VIEW v1 AS SELECT col1, col2, col3, col4 FROM t1 WHERE col4 1000 WITH CHECK OPTIONWhat is the effect of the CHECK OPTION clause?（）A、Any row inserted or updated through view V1 must meet the condition that col4 1000.B、From now on, any row inserted or updated in table T1 must meet the condition that col4 1000, but existing rows in the table are not checked.C、At view creation, DB2 will check the data in table T1, and if in any row doesn't meet the condition col4 1000, the view creation will be rejected.D、Any row inserted or updated through view V1 must meet the condition that col4 1000 and no row in table T1 can be updated such that col4 = 1000, but new rows in the table can be inserted with col4 = 1000.” 相关考题
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Use the DESCRIBE command on the EMP_DEPT_VU view.B
Use the DEFINE VIEW command on the EMP_DEPT_VU view.C
Use the DESCRIBE VIEW command on the EMP_DEPT_VU view.D
Query the USER_VIEWS data dictionary view to search for the EMP_DEPT_VU view.E
Query the USER_SOURCE data dictionary view to search for the EMP_DEPT_VU view.F
Query the USER_OBJECTS data dictionary view to search for the EMP_DEPT_VU view.
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A view is created during execution and a filter on the view limits the rows to 20 percent of the total rows.D
A TOP-N query is created to limit the rows to 20 percent of the total rows
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