-
A view is created with the following statement:CREATE VIEW v1 AS SELECT col1, col2, col3, col4 FROM t1 WHERE col4 > 1000 WITH CHECK OPTIONWhat is the effect of the CHECK OPTION clause?()
A . Any row inserted or updated through view V1 must meet the condition that col4 > 1000.
B . From now on, any row inserted or updated in table T1 must meet the condition that col4 > 1000, but existing rows in the table are not checked.
C . At view creation, DB2 will check the data in table T1, and if in any row doesn't meet the condition col4 > 1000, the view creation will be rejected.
D . Any row inserted or updated through view V1 must meet the condition that col4 > 1000 and no row in table T1 can be updated such that col4 <= 1000, but new rows in the table can be inserted with col4 <= 1000.
-
A view is created with the following statement:CREATE VIEW v1 AS SELECT col1, col2, col3 FROM t1 WHERE col4 > 1000 ; When will DB2 access the data from table T1 for view V1?()
A . When view V1 is created
B . Each time the REFRESH VIEW v1 statement is executed
C . Each time an SQL statement is executed against view V1
D . Only the first time an SQL statement is executed against view V1
-
烽火R2001面板上的“COL“指示灯表示什么含义()
A . A、CRC校验错误
B . B、E1收信号帧失步告警
C . C、以太网口检测到冲突
D . D、表示以太网口为全双工工作模式
-
英译汉:grid spikes
-
Col质粒
-
在AutoCAD中,用GRID栅格命令能够控制栅格显示的方向。()
A . 正确
B . 错误
-
美国Grid2030计划包括()内容。
A . 建设国家电力骨干网
B . 建设区域互联电网
C . 建设局部、小型网
D . 建设微电网
-
在AutoCAD中,有关栅格命令GRID的叙述正确的有()。
A . 栅格虽然是可见的,但不是图的组成部分
B . 栅格点的范围总是充满整屏
C . 绘图机绘图时,如果栅格打开,则绘图机画出栅格
D . 可以设置栅格间距不等于捕捉间距
-
龈谷gingival col
-
AutoCAD的GRID(栅格)的显示区域是由()决定的。
-
对于表A(col1 int,col2 char(1)),表B(col1 int,col2char(1)),为确保表A的数据全部被保留,下面正确的联接方式是()
A . A inner join B
B . A left join B
C . A right join B
D . Across join B
-
对于表A(col1 int,col2 char(1))更新col1=1的数据col2值为N,下面语句正确的是()
A . update table A setcol2=’N’ where col1=1
B . modify table A setcol2=N where col1=1
C . update A set col2=’N’ where col1=1
D . modify A set col2=N where col1=1
-
Given two collection objects referenced by col1 and col2,which of these statements are true?()
A . The operation col1.retainAll(col2) will not modify the col1 object.
B . The operation col1.removeAll(col2) will not modify the col2 object.
C . The operation col1.addAll(col2) will return a new collection object, containing elements from both col1 and col2.
D . The operation col1.containsAll(Col2) will not modify the col1 object.
-
Bootstrap类只影响该类提到的设备。例如,.col-sm-3只影响小型设备。
-
com在collect中之所以变成了col,是辅音同化的结果。
-
图形窗口显示网格的命令是grid on
-
Elle s’est mise dans colère noire.
-
假定一个表单里有一个文本框Text1和一个命令按钮组CommandGroup1,命令按钮组中包含Command1和Command2两个命令按钮。如果要从Command1命令按钮的某个方法中访问文本框的Value属性值,下面式子中正确的是( )。
A.This.ThisForm.Text1.Value
B.This.Parent.Parent.Text1.Value
C.Parent.Parent.Text1.Value
D.This.Parent.Text1.Value
-
设:有一个表T1,分别由以下字段组成:col1(NUMBER),col2(DATE),col3(VACHAR2),以下insert语句合法的是哪两项?()
A.insertintoT1(col1,col2,col3)values(568,'2-3月-2009','HUNTER')
B.insertintoT1values(568,'2-3月-2009','HUNTER')
C.insertintoT1(col1,col2,col3)values(568,2-3月-2009,'HUNTER')
D.insertintoT1(col1,col2,col3)values('568','2-3月-2009',HUNTER)
-
假定一个表单里有一个文本框Text1和一个命令按钮组CommandGroup1,命令按钮组是一个容器对象,其中包含Command1和Command2两个命令按钮,如果要在Command1命令按钮的某个方法中访问文本框的Value属性值,下面式子正确的是( )。
A.This.ThisForm.Text1.Value
B.This.Parent.Parent.Text1.Value
C.Parent.Parent.Text1.Value
D.This.Parent.Text1.Value
-
The following statements:CREATE TABLE t1 (col1 INT NOT NULL, PRIMARY KEY(col1)); CREATE TA
The following statements:CREATE TABLE t1 (col1 INT NOT NULL, PRIMARY KEY(col1)); CREATE TABLE t2 (col1 INT NOT NULL, col2 CHAR(1) NOT NULL, PRIMARY KEY (col1, col2), FOREIGN KEY (col1) REFERENCES t1 (col1) ON DELETE CASCADE ON UPDATE RESTRICT); CREATE TABLE t3 (col1 INT NOT NULL, col2 INT NOT NULL, PRIMARY KEY (col1, col2),FOREIGN KEY (col1) REFERENCES t1 (col1) ON DELETE NO ACTION ON UPDATE RESTRICT);INSERT INTO t1 VALUES (1), (2); INSERT INTO t2 VALUES (1, ‘a‘), (1, ‘b‘), (2,‘c‘); INSERT INTO t3 VALUES (1, 100), (2, 200), (2,300);How many rows will be deleted by the following DELETE statement? DELETE FROM t1 WHERE col1= 1;()
A.4
B.3
C.1
D.0
-
.col-sm-3代表的含义是()
A.布局了一个在小型设备中占3个单位宽度的栅格。
B.布局了一个在中型设备中占3个单位宽度的栅格。
C.布局了一个在大型设备中占3个单位宽度的栅格。
D.布局了一个在大型设备中占5个单位宽度的栅格。
-
约束文件中“set_propertyPULLDOWNtrue[get_ports{col[3]}]”是()。
A.将第3列上拉至高电平
B.将任意列上拉至高电平
C.将任意下拉至低电平
D.将第3列下拉至低电平
-
Bootstrap布局中,col-md-*定义的是()。
A.中型显示设备(≥992px且<1200px)下显示的
B.超小设备手机(<768px)下显示的
C.大型显示尺寸(≥1200px)的设备下显示的
D.小型设备,平板电脑等(≥768px且<992px)下显示的