Oracle:带时间戳的SQL选择日期 [英] Oracle: SQL select date with timestamp

问题描述

我有以下数据:

SQL> select * from booking_session;

BK_ID|BK_DATE
-----|-------------------------
    1|18-MAR-12 10.00.00.000000
    2|18-MAR-12 10.25.00.000000
    3|18-MAR-12 10.30.00.000000
    4|18-MAR-12 10.35.00.000000
    5|18-MAR-12 10.40.00.000000

我正在尝试编写一个sql查询，该查询选择与某个日期匹配的所有记录，但是我正在对BK_DATE字段使用时间戳记，无论我尝试什么，我的查询都不会产生结果.

I am trying to write a sql query that selects all records that matches a certain date, however I am using timestamp for the BK_DATE field and no matter what I try it my query yields no results.

SQL :我已经尝试了以下查询，但没有任何结果

SQL: I have tried the following queries but they yield no results

1.

select * 
from booking_session
where bk_date = to_date('18-03-2012', 'dd-mm-yyyy');

2.

select * 
from booking_session
where bk_date = to_timestamp('18-03-2012', 'dd-mm-yyyy');

3.

select * 
from booking_session
where bk_date = to_date('18-MAR-2012', 'dd-mm-yyyy');

仅当我将整个日期值设置为时才有效；

It only works when I set the whole date value like;

select * 
from booking_session
WHERE bk_date = '18-MAR-12 11.00.00.000000';


CREATE TABLE BOOKING_SESSION(
  BK_ID NUMBER NOT NULL,
  BK_DATE TIMESTAMP,
  BK_BOOKER NUMBER,
  BK_CUSTOMER NUMBER,
  BK_TREATMENT NUMBER,
  T_SESSION_DATETIME TIMESTAMP,
  STAFFAPPOINTED NUMBER,
  BK_ROOM NUMBER
);

INSERT INTO BOOKING_SESSION VALUES (
  1,
  TO_TIMESTAMP('18/03/2012 10:00', 'DD/MM/YYYY HH24:MI'),
  1,
  1,
  1,
  TO_TIMESTAMP('20/03/2012 11:00', 'DD/MM/YYYY HH24:MI'),2,1
);

推荐答案

尼古拉斯·克拉斯诺夫(Nicholas Krasnov)提供的答案

Answer provided by Nicholas Krasnov

SELECT *
FROM BOOKING_SESSION
WHERE TO_CHAR(T_SESSION_DATETIME, 'DD-MM-YYYY') ='20-03-2012';

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