单项选择题

Which of the following will begin a new unit of work?（）

A.The CONNECT statement
B.The first FETCH of a cursor
C.The BEGIN TRANSACTION statement
D.The first executable SQL statement

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单项选择题

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)

单项选择题

Which kind of non-sourced UDF can be created so that it only returns a single value?（）

A.Row
B.Table
C.Scalar
D.Column

单项选择题

Given the following stored procedure:CREATE PROCEDURE increase_salary ( IN p_workdept CHAR(6), OUT p_sum DECIMAL(9,2) ) SET p_sum = (SELECT SUM(salary) FROM employee WHERE workdept=p_workdept);How can this stored procedure be called from the Command Line Processor?（）

A.CALL increase_salary('A00')
B.VALUES increase_salary('A00')
C.CALL increase_salary('A00', ?)
D.VALUES increase_salary('A00', ?)