How to query by time in postgresql

In PostgreSQL, querying by time is a common operational requirement. Through reasonable time query, you can quickly filter out the data that meets the conditions. When using PostgreSQL for time query, you can use a variety of methods, such as using comparison operators, using date functions, etc. For example, you can use the "=" operator to query data on a specific date, use the "BETWEEN" operator to query data within a certain time range, or use date functions such as "date_trunc" to be precise to a certain time unit. Inquire. In short, mastering these skills can make us perform time queries more efficiently.

Question content

I have a table where my date/time is in the format: 2022-08-10 20:55:16.695 This is an object with a timestamp. I tried the following query but no rows were returned:

select * from device where to_char(device_created_at,'yyyy-mm-dd hh24:mi:ss.fff') = '2022-08-10 20:55:16.695'

The type of device_created_at is "timestamp without time zone"

How to query based on timestamp in postgressql?

Workaround

Try comparing timestamp values ​​instead of strings:

SELECT * 
FROM device 
WHERE device_created_at = CAST('2022-08-10 20:55:16.695' AS TIMESTAMP)

See the demo here.

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