Given that tables T1 and T2 contain the following rows: Table T1: C1 C2 5 4 5 2 5 5 Table T2: C1 C2 5 1 5 2 5 3 Which of the following queries will return only those rows that exist in T1 and not in T2?()
第1题:
A.SELECT * FROM t1 UNION SELECT * FROM t2
B.SELECT * FROM t1 UNION DISTINCT SELECT * FROM t2
C.SELECT * FROM t1 INTERSECT SELECT * FROM t2
D.SELECT * FROM t1 WHERE (c1,c2)= (SELECT c1,c2 FROM t2)
第2题:
第3题:
( 25 )有如下模板声明:
template <typename T1, typename T2> class A;
下列声明中,与上述声明不等价的是
A ) template <class T1, class T2> class A;
B ) template <class T1, typename T2> class A;
C ) template <typename T1, class T2> class A;
D ) template <typename T1, T2> class A;
第4题:
下面哪个调度是串行调度()。
第5题:
颈椎、颈髓MRI扫描方位最好选()
第6题:
The datum from which the predicted heights of tides are reckoned in the tide tables is ______.
A.mean low water
B.the same as that used for the charts of the locality
C.the highest possible level
D.given in table three of the tide tables
第7题:
同一组织T1与T2值的关系是()。
第8题:
下面不属于同一函数模板的是( )。
A.template<class t1> t1 max(t1 &a,t1 &b) {…}template<class t2> t2 max(t2 &a,t2 &b) {…}
B.template<class t1>t1 max(t1 a,t1 b){…}template<class t2>t2 max(t2 &a,t2 &b){…}
C.template<class t1> t1 max(t1 * a,t1 * b) {…} template<class t2> t2 max(t2 &a,t2 &b) {…}
D.template<class t1>t1 max(t1 a,t1 b){…}template<class t2>t2 max(t2 &a,t2 &b,t2 c){…}
第9题:
在下列模板说明中,正确的是()
第10题:
高浓度顺磁造影剂对质子弛豫时间的影响为()。