Anubhav Gain

Anubhav Gain

Security Software Engineer · XDR/OXDR Architect · Rust & eBPF · 222+ Research Citations

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127 words

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The SQLite now argument is stable within the same query

Anubhav Gain

2024-01-19

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sqlite

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database

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web

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testing

The SQLite now argument is stable within the same query#

I stumbled across an interesting little detail of SQLite today, running the following query:

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select strftime('%s','now') || substr(strftime('%f','now'),4) as t1
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union all
3
select strftime('%s','now') || substr(strftime('%f','now'),4)
4
union all
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select strftime('%s','now') || substr(strftime('%f','now'),4)
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union all
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select strftime('%s','now') || substr(strftime('%f','now'),4)
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union all
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select strftime('%s','now') || substr(strftime('%f','now'),4)
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union all
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select strftime('%s','now') || substr(strftime('%f','now'),4)

That strftime() pattern is described here and in this TIL, it returns the current Unix timestamp in milliseconds.

The result of the above query is:

t1
1675631847614
1675631847614
1675631847614
1675631847614
1675631847614
1675631847614

I was expecting each timestamp to differ by a few milliseconds, but they’re all the same.

I spotted why in the SQLite Date and Time Functions documentation:

The ‘now’ argument to date and time functions always returns exactly the same value for multiple invocations within the same sqlite3_step() call.

The SQLite now argument is stable within the same query

https://mranv.pages.dev/posts/the-sqlite-now-argument-is-stable-within-the-same-query/

Author

Anubhav Gain

Published at

2024-01-19

License

CC BY-NC-SA 4.0

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The SQLite now argument is stable within the same query