IBM(000-730)

单选题Given that tables T1 and T2 contain the following rows: Table T1: C1 C2 1 4 1 3 1 2 Table T2: C1 C2 1 1 1 2 1 3 Which of the following queries will return only those rows that exist in both T1 and T2?（）A SELECT * FROM t1 UNION SELECT * FROM t2B SELECT

题目
单选题
Given that tables T1 and T2 contain the following rows: Table T1: C1 C2 1 4 1 3 1 2 Table T2: C1 C2 1 1 1 2 1 3 Which of the following queries will return only those rows that exist in both T1 and T2?（）
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)

参考答案和解析
正确答案： C
解析： 暂无解析
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相似问题和答案

第1题：

Assuming PUBLIC has been granted all privileges on table T1, which of the following statements would continue to permit any user to add rows to table T1, but not remove them?()

A.REVOKE DROP ON t1 FROM PUBLIC

B.REVOKE UPDATE ON t1 FROM PUBLIC

C.REVOKE DELETE ON t1 FROM PUBLIC

D.REVOKE CONTROL ON t1 FROM PUBLIC


参考答案：C

第2题：

Given that tables T1 and T2 contain the following rows: Table T1:C1 C25 4 5 2 5 5Table T2: C1 C2 5 1 5 2 5 3Which of the following queries will return only those rows that exist in T1 and not in T2?()

A.SELECT * FROM T1 MINUS SELECT * FROM T2

B.SELECT * FROM T1 EXCEPT SELECT * FROM T2

C.SELECT * FROM T2 UNION EXCEPT SELECT * FROM T1

D.SELECT * FROM T1 NOT EXISTS SELECT * FROM T2


参考答案：B

第3题：

Which of the following SQL statements will return the year and average salary for all employees hired within a given year that have a salary greater than $30,000?()

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)


参考答案：B

第4题：

存在两个结构相同的数据库表T1（col1，col2，col3）、T2（col1，col2，col3），写出一SQL语句将所有T1数据导入到T2表（）

  • A、select col1，col2，col3 from T1 into T2（col1，col2，col3）
  • B、insert T1 （col1，col，col3） into T2（col1，col2，col3）
  • C、insert into T2 （col1，col2，col3） as select col1，col2，col3 from T1
  • D、insert into T2（col1，col2，col3） select col1，col2，col3 from T1；

正确答案:D

第5题：

Given that tables T1 and T2 contain the following rows: Table T1: C1 C2 1 4 1 3 1 2 Table T2: C1 C2 1 1 1 2 1 3 Which of the following queries will return only those rows that exist in both T1 and T2?（）

  • 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)

正确答案:C

第6题：

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


参考答案：D

第7题：

设某数据库中有表Tl(c1,c2,c3),并只对U1执行了如下授权语句:GRANT SELECT ON T1 TO U1下列语句中,U1无权执行的是( )。

A.GRANT SELECT ON T1 TO U2

B.SELECT*FROM T1

C.SELECT c1 FROM T1

D.SELECT c1.c2 FROM T1


参考答案：A

第8题：

Given that tables T1 and T2 contain the following rows:Table T1: C1 C2 1 4 1 3 1 2Table T2: C1 C2 1 1 1 2 1 3Which of the following queries will return only those rows that exist in both T1 and T2?()

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)


参考答案：C

第9题：

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.

正确答案:A

第10题：

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?（）

  • A、SELECT * FROM T1 MINUS SELECT * FROM T2
  • B、SELECT * FROM T1 EXCEPT SELECT * FROM T2
  • C、SELECT * FROM T2 UNION EXCEPT SELECT * FROM T1
  • D、SELECT * FROM T1 NOT EXISTS SELECT * FROM T2

正确答案:B

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