You can join a maximum of two tables through an equijoin.
You can join a maximum of two columns through an equijoin.
You specify an equijoin condition in the SELECT or FROM clauses of a SELECT statement.
To join two tables through an equijoin, the columns in the join condition must be primary key and foreign key columns.
You can join n tables (all having single column primary keys) in a SQL statement by specifying a minimum of n-1 join conditions.
第1题:
A. You can join a maximum of two tables through an equijoin.
B. You can join a maximum of two columns through an equijoin.
C. You specify an equijoin condition in the SELECT or FROM clauses of a SELECT statement.
D. To join two tables through an equijoin, the columns in the join condition must be primary key and foreign key columns.
E. You can join n tables (all having single column primary keys) in a SQL statement by specifying a minimum of n-1 join conditions.
第2题:
You are the administrator of a database that contains 64 lookup tables. These tables store static data that should not change. However, users report that some of this data is being changed. You need to prevent users from modifying the data.
You want to minimize changes to your security model and to your database applications. How should you modify the database?
A.Create a filegroup named LOOKUP. Move the lookup tables to this filegroup. Select the read only check box for the filegroup.
B.Create a database role named datamodifier. Grant SELECT permissions to the datamodifier role. Add all users to the role.
C.Deny INSERT, UPDATE, and DELETE permissions for all users. Create stored procedures that modify data in all tables except lookup tables. Require users to modify data through these stored procedures.
D.Create a view of the lookup tables. Use the view to allow users access to the lookup tables.
第3题:
Regarding the extended ping command; which of the statements below are true?
(Select all valid answer choices)
A.The extended ping command is supported from user EXEC mode.
B.The extended ping command is available from privileged EXEC mode.
C.With the extended ping command you can specify the TCP and UDP port to be pinged.
D.With the extended ping command you can specify the timeout value.
E.With the extended ping command you can specify the datagram size.
第4题:
Which two are true about aggregate functions? ()
第5题:
What is true about joining tables through an equijoin?()
第6题:
A.You want to create a nonequijoin.
B.The tables to be joined have multiple NULL columns.
C.The tables to be joined have columns of the same name and different data types.
D.The tables to be joined have columns with the same name and compatible data types.
E.You want to use a NATURAL join, but you want to restrict the number of columns in the join condition.
第7题:
Which two statements are true regarding the USING clause in table joins?()
第8题:
A. You cannot update a view with group functions.
B. When you update a view group functions are automatically computed.
C. When you update a view only the constraints on the underlying table will be in effect.
D. When you update a view the constraints on the views always override the constraints on the underlying tables.
第9题:
Click the Exhibit button and examine the data in the EMPLOYEES and DEPARTMENTS tables.You want to retrieve all employees, whether or not they have matching departments in the departments table. Which query would you use?()
第10题:
Which two statements are true regarding the ORDER BY clause? ()