更多"What is true of using group functio"的相关试题:
[单项选择]What is true of using group functions on columns that contain NULL values?()
A. Group functions on columns ignore NULL values.
B. Group functions on columns returning dates include NULL values.
C. Group functions on columns returning numbers include NULL values.
D. Group functions on columns cannot be accurately used on columns that contain NULL values.
E. Group functions on columns include NULL values in calculations if you use the keyword INC_NULLS.
[单项选择]To understand what true happiness is, one must ______.
[单项选择]What is TRUE about the words
[单项选择]What is TRUE of human sleep
A. Most people need less sleep when grow older.
B. Most people need seven and a half hours of sleep every night.
C. On average, people in the U. S. today sleep less per night than they used to.
D. For most people, less than six hours of sleep on a typical work night is enough.
[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 Jove according to the author
[单项选择]What is true about dime novels in nowadays
[单项选择]What is true to the fact in America
A. There are more and more members in a family.
B. There are less and less members in a family.
C. There is an increasing number of grandparents who refuse to lood after their grandchildren.
D. There is an increasing number of grandparents who live separately from their children.
[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. Once created, a sequence belongs to a specific schema.
B. Once created, a sequence is linked to a specific table.
C. Once created, a sequence is automatically available to all users.
D. Only the DBA can control which sequence is used by a certain table.
E. Once created, a sequence is automatically used in all INSERT and UPDATE statements.
[单项选择]What is true regarding subqueries?()
A. The inner query always sorts the results of the outer query
B. The outer query always sorts the results of the inner query
C. The outer query must return a value to the outer query
D. The inner query returns a value to the outer query
E. The inner query must always return a value or the outer query will give an error