如何使用默认时间戳定义今天的日期

Question

I am using postgressql i wish to get the data for currentdate, i want filter the data based on the date in data base my plandate filed is define as Time stamp with time zone so its showing like this format 2013-09-01 03:22:01.438348+05:30 my query is like this

 select ttodoid ,date,details from ttodo where date=currentdate():

but currentdate function giving me just date '2013-10-06' based on this result is no rows how can i manage it for today date detail

Answer 1

UPDATED: One way to do it

SELECT *
  FROM ttodo
 WHERE date BETWEEN DATE_TRUNC('day', CURRENT_TIMESTAMP) 
                AND DATE_TRUNC('day', CURRENT_TIMESTAMP) 
                  + INTERVAL '1 DAY' 
                  - INTERVAL '1 MICROSECOND';

or

SELECT * 
  FROM ttodo
 WHERE date >= DATE_TRUNC('day', CURRENT_TIMESTAMP) 
   AND date <  DATE_TRUNC('day', CURRENT_TIMESTAMP) 
             + INTERVAL '1 DAY';

Here is SQLFiddle demo

Answer 2

从ttodo中选择*，其中（ttodo.todoplandate :: date = current_date）或（ttodo.todoplandate :: date <current_date

Answer 3

I think the easier approach would be just to convert your field to date :

SELECT ttodoid ,date,details FROM ttodo
WHERE CAST(date AS DATE) = current_date;

Notice that, ff you want this query to be indexed, you have to create the index with the cast:

CREATE INDEX idx_ttodo_date ON ttodo ((CAST(date AS DATE)));

Another approach, is instead of casting the field, is checking the intervals, something similar of what petern proposed , but with correct intervals:

SELECT ttodoid ,date,details FROM ttodo
WHERE date >= date_trunc('day', current_timestamp)
      AND date < (date_trunc('day', current_timestamp) + interval '1day');

This approach has the advantage that it can use an index on the date field only, which is good if you already have it.