更多"What is true about updates through "的相关试题:
[单项选择]What is true about updates through a view?()
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.
[单项选择]What is TRUE about the words
[单项选择]What is TRUE about vacuum cleaners
A. The whirring of the fan does not necessarily occur at a high speed.
B. A vacuum is created as the fan sucks air into the inner compartment.
C. As a vacuum cleaner works, a magnetic field is created, drawing dust, dirt and other particles into the machine.
D. There is a filter in a vacuum cleaner, whose sole function is to permit air to flow through.
[单项选择]What is true about dime novels in nowadays
[单项选择]What is true about the Philadelphia Public Ledger and the Baltimore Sun
A. They turned out to be failures.
B. They were later purchased by James Gordon Bennett.
C. They were also founded by Benjamin Day.
D. They became well-known newspapers in the U.S.
[单项选择]What is true about sequences? ()
A. The start value of the sequence is always 1.
B. A sequence always increments by 1.
C. The minimum value of an ascending sequence defaults to 1.
D. The maximum value of descending sequence defaults to 1.
[单项选择]What is true about the Connexion service to cruise ships and oil exploration platforms
A. Boeing is trying to provide them with the service.
B. They cannot get the service now because the sky is limited.
C. The service is not available to them now as Boeing is busy servicing the fliers.
D. They can get the service because they are in the limit of the project.
[单项选择]What is true about the pre-modern era
A. People feel worried about taking omnibuses, horse railways, commuter trains, and electric trolleys.
B. People are eager to live and shop in the far away place.
C. Middle class group tends to move out of the city
D. There is an exploration in urban population, esp. very large cities.
[单项选择]What is true about games according to the passage
A. Puritans thought games were harmful to them.
B. Games are more important than jobs to us.
C. People will no long depend on games for fun in future.
D. Games will be the primary concern of the people in the future.
[单项选择]What is true about joining tables through an equijoin?()
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.
[单项选择]What is NOT true about the eight girls
A. They are all between 12 and 17.
B. They have tried a variety of measures.
C. They attend a suicide squad.
D. All their attempts to commit suicide are vital.