将varchar转换为Number并在oracle中进行比较

时间:2013-06-13 12:16:30

标签: plsql oracle11g

我在表中有两列数据类型为varchar2。 现在我想根据输入值获取数据,基于此我的选择查询如下所示:

    select fromtime, totime from temp_trd_shr where 
fromtime <= '08:00' and  totime >='10:00' 

Fromtime:varchar2(50) totime:varchar2(50) 08:00&amp; 10:00:输入值(字符串和格式总是像xx:xx一样修复) Oracle 11g

我尝试使用to_number,但我无法做到这一点。

1 个答案:

答案 0 :(得分:3)

CREATE TABLE temp_trd_shr
(
    fromtime VARCHAR2(5)
,   totime   VARCHAR2(5)
);

INSERT INTO temp_trd_shr VALUES ('01:00', '18:00');
INSERT INTO temp_trd_shr VALUES ('02:00', '17:00');
INSERT INTO temp_trd_shr VALUES ('03:00', '16:00');
INSERT INTO temp_trd_shr VALUES ('04:00', '15:00');
INSERT INTO temp_trd_shr VALUES ('05:00', '14:00');
INSERT INTO temp_trd_shr VALUES ('06:00', '13:00');

INSERT INTO temp_trd_shr VALUES ('08:30', '09:30');
INSERT INTO temp_trd_shr VALUES ('08:45', '09:45');

SELECT  COUNT(*)
FROM    temp_trd_shr;
-- 8

SELECT  *
FROM    temp_trd_shr
WHERE   TO_NUMBER(REPLACE(fromtime, ':')) <= TO_NUMBER(REPLACE('08:00', ':'))
AND     TO_NUMBER(REPLACE(totime,   ':')) >= TO_NUMBER(REPLACE('10:00', ':'))
ORDER   BY
        1
;
/*
01:00   18:00
02:00   17:00
03:00   16:00
04:00   15:00
05:00   14:00
06:00   13:00
*/