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

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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?（）

SELECT * FROM t1 UNION SELECT * FROM t2

SELECT * FROM t1 UNION DISTINCT SELECT * FROM t2

SELECT * FROM t1 INTERSECT SELECT * FROM t2

SELECT * FROM t1 WHERE (c1,c2)= (SELECT c1,c2 FROM t2)

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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 t2B.SELECT * FROM t1 UNION DISTINCT SELECT * FROM t2C.SELECT * FROM t1 INTERSECT SELECT * FROM t2D.SELECT * FROM t1 WHERE (c1,c2)= (SELECT c1,c2 FROM t2)

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第2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 t2B.SELECT * FROM t1 UNION DISTINCT SELECT * FROM t2C.SELECT * FROM t1 INTERSECT SELECT * FROM t2D.SELECT * FROM t1 WHERE (c1,c2)= (SELECT c1,c2 FROM t2)

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第3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 PUBLICB.REVOKE UPDATE ON t1 FROM PUBLICC.REVOKE DELETE ON t1 FROM PUBLICD.REVOKE CONTROL ON t1 FROM PUBLIC

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第4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.4B.3C.1D.0

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第5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 T2B.SELECT * FROM T1 EXCEPT SELECT * FROM T2C.SELECT * FROM T2 UNION EXCEPT SELECT * FROM T1D.SELECT * FROM T1 NOT EXISTS SELECT * FROM T2

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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 U2B.SELECT*FROM T1C.SELECT c1 FROM T1D.SELECT c1.c2 FROM T1

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第7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 * FROM t1 UNION DISTINCT SELECT * FROM t2C、SELECT * FROM t1 INTERSECT SELECT * FROM t2D、SELECT * FROM t1 WHERE (c1,c2)= (SELECT c1,c2 FROM t2)

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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

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