postgresql 在日期之间使用 java 搜索时间戳

Question

I have with my partner a project for uni. one question is to select timestamps between dates. IE

select * from table where timestamp >= 2020-10-10 and 2020-10-15.

it works fine, but the timestamp doesnt show the 2020-10-15 day.

is there a good way to include the full day?

Answer 1

I have with my partner a project for uni. one question is to select timestamps between dates. IE

select * from table where timestamp >= 2020-10-10 and 2020-10-15.

it works fine, but the timestamp doesnt show the 2020-10-15 day.

is there a good way to include the full day?

Answer 2

First cast "timestamp" to date and then as @ArvindKumarAvinash said in his answer use inclusive between . This would include the full day.

SELECT * FROM _table WHERE _timestamp::date BETWEEN '2020-10-10' AND '2020-10-15';

Answer 3

Your WHERE expression is wrong. When using >= and < you need to repeat the column name.

When comparing a timestamp value (date and time) with a date value (without time), it's usually better to use < on the upper bound and compare with the "next" day, otherwise you wouldn't catch the values after 00:00:00

select * 
from table 
where "timestamp" >= date '2020-10-10' 
  and "timestamp" < date '2020-10-15' + 1;

This is more efficient than casting "timestamp" to a date, as this expression can make use of an index on the "timestamp" column.