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1
楼
哪一个PLSQL块执行之后会显示下面的三行数字？
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1
2
A
DECLARE
TYPE numbers_t IS TABLE OF NUMBER;
l_numbers numbers_t := numbers_t ();
BEGIN
DBMS_OUTPUT.put_line (l_numbers.COUNT);
l_numbers.EXTEND ();
l_numbers (1) := 100;
DBMS_OUTPUT.put_line (l_numbers.COUNT);
l_numbers.EXTEND ();
DBMS_OUTPUT.put_line (l_numbers.COUNT);
END;
/
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2
B
DECLARE
TYPE numbers_t IS TABLE OF NUMBER;
l_numbers numbers_t := numbers_t ();
BEGIN
DBMS_OUTPUT.put_line (l_numbers.COUNT);
l_numbers.EXTEND (2);
l_numbers (1) := 100;
DBMS_OUTPUT.put_line (l_numbers.COUNT);
l_numbers (2) := 100;
DBMS_OUTPUT.put_line (l_numbers.COUNT);
END;
/
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2
2
C
DECLARE
TYPE numbers_t IS TABLE OF NUMBER;
l_numbers numbers_t := numbers_t ();
BEGIN
DBMS_OUTPUT.put_line (l_numbers.COUNT);
l_numbers.EXTEND (2);
l_numbers (1) := 100;
l_numbers.DELETE (1);
DBMS_OUTPUT.put_line (l_numbers.COUNT);
l_numbers (2) := 100;
DBMS_OUTPUT.put_line (l_numbers.COUNT);
END;
/
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1
1
D
DECLARE
TYPE numbers_t IS TABLE OF NUMBER;
l_numbers numbers_t := numbers_t ();
BEGIN
DBMS_OUTPUT.put_line (l_numbers.COUNT);
l_numbers.EXTEND (2);
l_numbers (1) := 100;
l_numbers.DELETE (1);
DBMS_OUTPUT.put_line (l_numbers.COUNT);
l_numbers (1) := 200;
l_numbers (2) := 100;
DBMS_OUTPUT.put_line (l_numbers.COUNT);
END;
/
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2
知识点后补
文章名称：2011-10-05COLLECTION-创新互联
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