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下列正确的命令是( )
A.show tables;
B.show columns;
C.show columns from customers;
D.show databases;
参考答案
更多 “ 下列正确的命令是( )A.show tables;B.show columns;C.show columns from customers;D.show databases; ” 相关考题
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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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In which of the following situations should correlation names be used?()
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【多选题】SQL注入常用的命令解释正确的是A．可以通过mysql的SCHEMATA表查询表信息B．可以通过TABLES表查询列信息C．可以通过COLUMNS表查询具体数据D．可以通过user表查询数据库用户信息
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ListView控件Columns属性的 方法动态添加列标头。
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