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Which of the following scenarios will ensure that the value of the NEXT_STEPNO column in a given row of table TABLEX exists as a value of column STEPNO (usually in another row) in the same table?（）
- A、Define a UNIQUE constraint on the columns NEXT_STEPNO and STEPNO.
- B、Define a CHECK constraint on the NEXT_STEPNO column (NEXT_STEPNO = STEPNO).
- C、Define column STEPNO as the primary key of TABLEX and column NEXT_STEPNO as a foreign key referencing column STEPNO of the same table.
- D、Define column NEXT_STEPNO as the primary key of TABLEX and column STEPNO as a foreign key referencing column NEXT_STEPNO in the same table.
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更多 “Which of the following scenarios will ensure that the value of the NEXT_STEPNO column in a given row of table TABLEX exists as a value of column STEPNO (usually in another row) in the same table?（）A、Define a UNIQUE constraint on the columns NEXT_STEPNO and STEPNO.B、Define a CHECK constraint on the NEXT_STEPNO column (NEXT_STEPNO = STEPNO).C、Define column STEPNO as the primary key of TABLEX and column NEXT_STEPNO as a foreign key referencing column STEPNO of the same table.D、Define column NEXT_STEPNO as the primary key of TABLEX and column STEPNO as a foreign key referencing column NEXT_STEPNO in the same table.” 相关考题
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Which of the following scenarios will ensure that the value of the NEXT_STEPNO column in a given row of table TABLEX exists as a value of column STEPNO (usually in another row) in the same table?()
A.Define a UNIQUE constraint on the columns NEXT_STEPNO and STEPNO.B.Define a CHECK constraint on the NEXT_STEPNO column (NEXT_STEPNO = STEPNO).C.Define column STEPNO as the primary key of TABLEX and column NEXT_STEPNO as a foreign key referencing column STEPNO of the same table.D.Define column NEXT_STEPNO as the primary key of TABLEX and column STEPNO as a foreign key referencing column NEXT_STEPNO in the same table.
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When defining a referential constraint between the parent table T2 and the dependent table T1, which of the following is true?（）A、The list of column names in the FOREIGN KEY clause can be a subset of the list of column names in the primary key of T2 or a UNIQUE constraint that exists on T2.B、The list of column names in the FOREIGN KEY clause can be a subset of the list of column names in the primary key of T1 or a UNIQUE constraint that exists on T1.C、The list of column names in the FOREIGN KEY clause must be identical to the list of column names in the primary key of T2 or a UNIQUE constraint that exists on T2.D、The list of column names in the FOREIGN KEY clause must be identical to the list of column names in the primary key of T1 or a UNIQUE constraint that exists on T1.
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You create a Web Form that displays a GridView. The GridViews data source is a DataSet named dsOrders. The DataSet contains two DataTables named Orders and OrderDetails. You create a relation between the two DataTables using the following code segment. (Line numbers are included for reference only.)01 dtOrders = dsOrders.Tables[“Orders”]; 02 dtOrderDetails = dsOrders.Tables[“OrderDetail”]; 03 colParent = dtOrders.Columns[“OrderID”]; 04 colChild = dtOrderDetails.Columns[“ParentOrderID”]; 05 dsOrders.Relations.Add(“Rell”, colParent, colChild, false); You need to find the cause of the exception being raised in line 05. What should you do? （）A、Ensure that the child column and the parent column have the same names.B、Ensure that the child table and the parent table have the same names.C、Ensure that the child column and the parent column have the same data types.D、Ensure that each row in the child table has a corresponding row in the parent table.E、Ensure that the tables have an explicit relationship defined by a foreign key constraint in the database.
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You are modifying a table named Product in a SQL Server 2005 database. You want to add a new column named FriendlyName to the Product table. A friendly name for each product will be stored in this column. The table currently contains data. The sales department has not yet created a friendly name for each product. FriendlyName is a required value for each product. You want to add this new column by using the least amount of effort. What should you do？（）A、Define the new column as NULL.Update the FriendlyName column to the same value as the productName column. Alter the FriendlyName column to be NOT NULL.B、Define the new column as NOT NULL with a default value of ’Undefined.’C、Define the new column as NULL. Use application logic to enforce the data constraint.D、Define the new column as NULL with a default value of ’Undefined.’
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Which two statements are true regarding single row functions?（）A、They accept only a single argument B、They can be nested only to two levels C、Arguments can only be column values or constants D、They always return a single result row for every row of a queried table E、They can return a data type value different from the one that is referenced
考题
单选题Which of the following scenarios will ensure that the value of the NEXT_STEPNO column in a given row of table TABLEX exists as a value of column STEPNO (usually in another row) in the same table?（）A
Define a UNIQUE constraint on the columns NEXT_STEPNO and STEPNO.B
Define a CHECK constraint on the NEXT_STEPNO column (NEXT_STEPNO = STEPNO).C
Define column STEPNO as the primary key of TABLEX and column NEXT_STEPNO as a foreign key referencing column STEPNO of the same table.D
Define column NEXT_STEPNO as the primary key of TABLEX and column STEPNO as a foreign key referencing column NEXT_STEPNO in the same table.
考题
单选题Which statement describes the effect on an index， when the indexed column for the rows is updatedin the base table（）A
An update in a leaf row takes place.B
The index becomes invalid after the update.C
The leaf block containing the row to be updated is marked as invalid.D
A row in the leaf block of the index for the key value is logically deleted and a new leaf row is inserted
考题
单选题The SCOTT user has an index on the ITEM_DESC column of the ITEM table. As part of the year-ending task， SCOTT updates the ITEM_DESC column for most of the rows in the ITEM table. How does this change to the table affect the index？（）A
An update in a leaf row takes place.B
The index becomes invalid after the update.C
The leaf block containing the row to be updated is marked as invalid.D
A row in the leaf block of the index for the key value is deleted and inserted.
考题
单选题You create a Web Form that displays a GridView. The GridViews data source is a DataSet named dsOrders. The DataSet contains two DataTables named Orders and OrderDetails. You create a relation between the two DataTables using the following code segment. (Line numbers are included for reference only.)01 dtOrders = dsOrders.Tables[“Orders”]; 02 dtOrderDetails = dsOrders.Tables[“OrderDetail”]; 03 colParent = dtOrders.Columns[“OrderID”]; 04 colChild = dtOrderDetails.Columns[“ParentOrderID”]; 05 dsOrders.Relations.Add(“Rell”, colParent, colChild, false); You need to find the cause of the exception being raised in line 05. What should you do? （）A
Ensure that the child column and the parent column have the same names.B
Ensure that the child table and the parent table have the same names.C
Ensure that the child column and the parent column have the same data types.D
Ensure that each row in the child table has a corresponding row in the parent table.E
Ensure that the tables have an explicit relationship defined by a foreign key constraint in the database.
考题
单选题36 You are creating a report wizard to create a matrix report. The query build, you select the patient_name column from the patient table; the doctor_name from the doctors table; and the doctor_ID, patient_ID and ID columns from the procedure table. In the report wizard you select patient_name as the row value, doctor_ID as the column values and the count as the cell values. You need to add a total for each doctors column. In the wizard report which tab will allow you to create the summary column?（）A
Rows B
Totals C
Columns D
Cells E
Data
考题
单选题You are modifying a table named Product in a SQL Server 2005 database. You want to add a new column named FriendlyName to the Product table. A friendly name for each product will be stored in this column. The table currently contains data. The sales department has not yet created a friendly name for each product. FriendlyName is a required value for each product. You want to add this new column by using the least amount of effort. What should you do？（）A
Define the new column as NULL.Update the FriendlyName column to the same value as the productName column. Alter the FriendlyName column to be NOT NULL.B
Define the new column as NOT NULL with a default value of ’Undefined.’C
Define the new column as NULL. Use application logic to enforce the data constraint.D
Define the new column as NULL with a default value of ’Undefined.’
考题
单选题Which of the following can be used to ensure that once a row has been inserted in table TABLEX, the column MAINID in that row cannot be updated?（）A
Define the column MAINID as NOT UPDATABLEB
Define the column MAINID as a PRIMARY KEYC
Define the column MAINID as a FOREIGN KEYD
Define an UPDATE trigger on table TABLEX
考题
单选题When defining a referential constraint between the parent table T2 and the dependent table T1, which of the following is true?（）A
The list of column names in the FOREIGN KEY clause can be a subset of the list of column names in the primary key of T2 or a UNIQUE constraint that exists on T2.B
The list of column names in the FOREIGN KEY clause can be a subset of the list of column names in the primary key of T1 or a UNIQUE constraint that exists on T1.C
The list of column names in the FOREIGN KEY clause must be identical to the list of column names in the primary key of T2 or a UNIQUE constraint that exists on T2.D
The list of column names in the FOREIGN KEY clause must be identical to the list of column names in the primary key of T1 or a UNIQUE constraint that exists on T1.
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