查询未正确减去

时间:2012-10-31 00:03:40

标签: sql oracle10g

我有这两个表:

SQL> SELECT * FROM TAB_A;
MYDATE        P4         D1      D2      P5      P6
--------- ---------- ---------- ----------- ----------- -----------
30-OCT-12    949,324  4,437,654  10,203,116  25,303,632  13,900,078


SQL> SELECT * FROM TAB_B;
MYDATE        P4         D1      D2      P5      P6
--------- ---------- ---------- ----------- ----------- -----------
30-OCT-12    937,796  4,388,477  10,091,811  25,028,402  13,755,882

我需要减去各自的列并将结果存储到第三个表中,如下所示:

SQL> INSERT INTO TAB_C (MYDATE, P4) SELECT SYSDATE,A.P4-B.P4 FROM  TAB_A A,TAB_B B WHERE A.MYDATE=B.MYDATE;

SQL> SELECT * FROM TAB_C;
MYDATE        P4         D1      D2      P5      P6
--------- ---------- ---------- ----------- ----------- -----------
30-OCT-12     926,268

结果是错误的。基础数学:949324-937796=11528。数值存储为数字数据类型。我在这里缺少什么?

2 个答案:

答案 0 :(得分:0)

SELECT SYSDATE ,A.P4, B.P4, A.P4-B.P4 
FROM  TAB_A A,TAB_B B 
WHERE A.MYDATE=B.MYDATE

确保p4值符合您的预期......

答案 1 :(得分:0)

试试这个:

INSERT INTO TAB_C (MYDATE, P4)
VALUES (SYSDATE, SELECT (A.P4-B.P4) FROM  TAB_A A, TAB_B B WHERE A.MYDATE=B.MYDATE)