Halil Pazarlama Halil Pazarlama - 1 year ago 241
MySQL Question

What is the difference between "utf8_unicode_ci" and "utf8_unicode_520_ci"

I recently upgraded my WAMPServer, and now in phpMyAdmin, I see both collations

. I normally use "utf8_unicode_ci" for my Turkish applications, but I wonder what is this new 520 thing? What is the difference?

Answer Source

As documented under Collation Names:

Unicode collation names may include a version number to indicate the version of the Unicode Collation Algorithm (UCA) on which the collation is based. UCA-based collations without a version number in the name use the version-4.0.0 UCA weight keys: http://www.unicode.org/Public/UCA/4.0.0/allkeys-4.0.0.txt. A collation name such as utf8_unicode_520_ci is based on UCA 5.2.0 weight keys: http://www.unicode.org/Public/UCA/5.2.0/allkeys.txt.

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