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<p><i>The sorting of UUIDs in SQL Server is rather confusing and incompatible with UUIDv6 and UUIDv7.<br>
Therefore this method developed by <a href="https://www.hickelsoft.de/">HickelSOFT</a>
generates UUIDs which are sortable by SQL Server.<br>
They have a time resolution of 1 milliseconds combined with 18 bits of random data.</i><br>
They have a time resolution of 1 milliseconds combined with 16 bits of random data.</i><br>
<a href="https://gist.github.com/danielmarschall/7fafd270a3bc107d38e8449ce7420c25">C# implementation</a> |
<a href="https://github.com/danielmarschall/uuid_mac_utils/blob/master/includes/uuid_utils.inc.php">PHP implementation</a>
</p>
259,7 → 259,7
}
</script>
<p><a id="uuidv8_sqlserver_info_button" href="javascript:show_uuidv8_sqlserver_info()">Show format</a>
<pre id="uuidv8_sqlserver_info" style="display:none">Version 2: Resolution of 1 milliseconds, random part of 18 bits, UTC time, 48 bit random "signature", UUIDv8 conform:
<pre id="uuidv8_sqlserver_info" style="display:none">Version 2: Resolution of 1 milliseconds, random part of 16 bits, UTC time, 48 bit random "signature", UUIDv8 conform:
- 16 bit Random data
- 8 bit UTC Milliseconds transformed from 1000ms to 0..255, deviation -2ms..2ms (hex encoded)
- 8 bit UTC Seconds (hex encoded)
267,11 → 267,11
- 4 bit UUID version 8
- 12 bit UTC Day of the year (1..366, hex encoded)
- 2 bit UUID Variant (0b10)
- 2 bit Random data
- 2 bit Unused (must be zero)
- 12 bit UTC Year (hex encoded)
- 48 bit Signature 0x5ce32bd83b96
Version 1: Resolution of 1 milliseconds, random part of 16 bits, local timezone, 48 zero bit "signature", NOT UUIDv8 conform:
Version 1: Resolution of 1 milliseconds, random part of 16 bits, local timezone, 48 zero bits "signature", NOT UUIDv8 conform:
- 16 bit Random data
- 8 bit Generator's local timezone Milliseconds transformed from 1000ms to 0..255, deviation -4ms..0ms (hex encoded)
- 8 bit Generator's local timezone Seconds (BCD encoded)