How to Retrieve The Date Part Out of a Datetime Result Column in Sqlite

How to retrieve the Date part out of a Datetime result column in SQLite?

You can use the DATE function.

Example

> select date('2011-04-26 18:40:34')
> 2011-04-26

You can get only the day with strftime,

> select strftime('%d', '2011-04-26 18:40:34')
> 26

Retrieve SQLite Data by using Date part out of DateTime Format

The date() function simply returns the date part of its parameter, so the result of date('2015-07-03T17:13:59') is '2015-07-03'. This value does not match any of the values in the date_value column.

You need to extract the date from the values in the date_value column:

Select * from Type where date(date_value) = '2015-07-03'

Select specific date from datetime field in SQLite

A simple way is to use inequalities:

where timestamp >= '1999-12-15' and
      timestamp < '1999-12-16'

This formulation allows SQLite to use indexes to retrieve the value -- if an appropriate index is available.

SQLite also has a date() function (which is really strftime() the basis of all SQLite date/time functions). So you can also write:

where date(timestamp) = '1999-12-15'

How to get DatePart out of datetime result column in SQLite

This is not one of the supported date/time formats.

Store your date/times in the format 2008-10-02 06:30:12 instead.

How to query all data with current date when column is datetime in sqlite?

You should strip off the time part of your timestamps with the function date():

WHERE date(createdDate) = date('now')

or:

WHERE date(createdDate) = CURRENT_DATE

Selecting previous dates from SQLite correctly

For the rows of the previous day use the function date() to strip off the time part of the timestamp:

WHERE date(timestamp) = date('now', '-1 day')

For the rows of the previous hour use the function strftime() with modifiers that strip off minutes and seconds:

WHERE strftime('%Y-%m-%d %H', timestamp) = strftime('%Y-%m-%d %H', 'now', '-1 hour')

SQLITE Order Column in DateTime closest to furthest Python

You're right that SQLite does not have a native datetime data type, however it can store such data:

SQLite does not have a storage class set aside for storing dates and/or times. Instead, the built-in Date And Time Functions of SQLite are capable of storing dates and times as TEXT, REAL, or INTEGER values:

• TEXT as ISO8601 strings ("YYYY-MM-DD HH:MM:SS.SSS").
• REAL as Julian day numbers, the number of days since noon in Greenwich on November 24, 4714 B.C. according to the proleptic Gregorian calendar.
• INTEGER as Unix Time, the number of seconds since 1970-01-01 00:00:00 UTC.

All of these options will sort as you'd expect. Pick the type that fits your use case best.

Tables in SQLite (and other relational databases) are ordered however the database engine finds most convenient. You can impose an order on the results when you query, e.g.

SELECT *
FROM my_table
ORDER BY created_at DESC;

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