How Can I Ensure Accurate Datetime Comparisons in SQLite?

Ensuring Accurate Datetime Comparisons in SQLite

SQLite employs a numerical representation for dates and times, based on the Julian Day system. This requires careful consideration of data storage and formatting to guarantee accurate comparisons.

Let's examine a potential issue:

<code class="language-sql">SELECT *
FROM table_1
WHERE mydate >= '1/1/2009' AND mydate < '5/5/2005';</code>

This query compares the mydate field to date strings. However, SQLite's internal date storage format is YYYYMMDD. Therefore, '1/1/2009' and '5/5/2005' are interpreted as '20010101' and '20050505' respectively, leading to incorrect results.

For reliable datetime comparisons in SQLite, the recommended practice is to store dates in the YYYYMMDD format. This ensures direct numerical comparison, preventing conversion errors and guaranteeing accuracy.

The above is the detailed content of How Can I Ensure Accurate Datetime Comparisons in SQLite?. For more information, please follow other related articles on the PHP Chinese website!