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【单选题】

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.

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?()”相关的问题
第1题

A、Create a table view.  B、Create a view in any schema.  C、Create a view in your schema.  D、Create a sequence view in any schema.  E、Create a view that is accessible by everyone.  F、Create a view only of it is based on tables that you created.  

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第2题

A、Create a table view.  B、Create a view in any schema.  C、Create a view in your schema.  D、Create a sequence view in any schema.  E、Create a view that is accessible by everyone.  F、Create a view only of it is based on tables that you created.  

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第3题

AA. Create a table view.  B、B. Create a view in any schema.  C、C. Create a view in your schema.  D、D. Create a sequence view in any schema.  E、E. Create a view that is accessible by everyone.  F、F. Create a view only of it is based on tables that you created.  

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第4题

A、When view V1 is created  B、Each time the REFRESH VIEW v1 statement is executed  C、Each time an SQL statement is executed against view V1  D、Only the first time an SQL statement is executed against view V1  

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第5题

A、Constraint names must start with SYS_C  B、All constraints must be defines at the column level  C、Constraints can be created after the table is created  D、Constraints can be created at the same time the table is created  E、Information about constraints is found in the VIEW_CONSTRAINTS dictionary view  

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第6题

A、Constraint names must start with SYS_C  B、All constraints must be defines at the column level  C、Constraints can be created after the table is created  D、Constraints can be created at the same time the table is created  E、Information about constraints is found in the VIEW_CONSTRAINTS dictionary view  

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第7题

AA. Constraint names must start with SYS_C  B、B. All constraints must be defines at the column level.  C、C. Constraints can be created after the table is created.  D、D. Constraints can be created at the same time the table is created.  E、E. Information about constraints is found in the VIEW_CONSTRAINTS dictionary view.  

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第8题

A、creates a view with constraints  B、creates a view even if the underlying parent table has constraints  C、creates a view in another schema even if you don't have privileges  D、creates a view regardless of whether or not the base tables exist  

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第9题

A、creates a view with constraints  B、creates a view even if the underlying parent table has constraints  C、creates a view in another schema even if you don't have privileges  D、creates a view regardless of whether or not the base tables exist  

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第10题

A、creates a view with constraints  B、creates a view even if the underlying parent table has constraints  C、creates a view in another schema even if you don't have privileges  D、creates a view regardless of whether or not the base tables exist  

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