A.AND
B.NOT
C.OR
D.XOR
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A.Select * from [order details] Order by quantity desc
B.Select * from [order details] Order by quantity asc
C.Select * from [order details] Order by quantity
D.Select * from [order details] Order by desc quantity
A.SELECT * FROM Products WHERE UnitPrice >= 20 OR UnitPrice <= 40
B.SELECT * FROM Products WHERE UnitPrice BETWEEN 20 OR 40
C.SELECT * FROM Products WHERE UnitPrice >= 20 AND UnitPrice <= 40
D.SELECT * FROM Products WHERE UnitPrice BETWEEN 20 AND 40
A.SELECT Product Name AS’產(chǎn)品的名稱’,Unit Price AS’單價(jià)’FROM Products
B.SELECT Product Name=產(chǎn)品的名稱,Unit Price=單價(jià)FROM Products
C.SELECT Product Name=“產(chǎn)品的名稱”,Uni tPrice=“單價(jià)”FROM Products
D.SELECT Product Name’產(chǎn)品的名稱’,Unit Price’單價(jià)’FROM Products
A.SELECT productname,price from products order by price ASC
B.SELECT productname,price from products order by price DESC
C.SELECT productname,price from products order by price
D.SELECT productname and price from products order by price DESC
A.select * from table_name where 1<=2
B.truncate table table_name
C.delete from table_name where null=null
D.alter table table_name add column idd int
最新試題
正常情況下一般刪除命令都會有帶WHERE子句。
out模式定義的參數(shù)只能在過程體內(nèi)部賦值,表示該參數(shù)可以將某個(gè)值傳遞回調(diào)用他的過程。
在MYSQL中,存儲過程不可以帶有參數(shù)。
視圖的意義:為用戶集中提取數(shù)據(jù)、隱蔽數(shù)據(jù)庫的復(fù)雜性,使操作簡便化、增加數(shù)據(jù)的安全性、提高表的邏輯獨(dú)立性。
MySQL變量可分為兩大類,即用戶變量和系統(tǒng)變量。
下列關(guān)于用戶權(quán)限說法正確的是()
在實(shí)際應(yīng)用中,為了防止新建視圖與已存在的視圖重名產(chǎn)生沖突,常用CREATE OR REPLACE VIEW來創(chuàng)建新視圖。
MySQL通過賦予/撤銷某個(gè)用戶對某個(gè)數(shù)據(jù)庫或某個(gè)表的某項(xiàng)權(quán)力(讀、寫、更改、刪除等),來保證數(shù)據(jù)安全。
在以下選項(xiàng)中哪些屬于視圖的功能()
視圖就是一個(gè)虛表,保存視圖時(shí),保存的是視圖的定義。