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MySQL 5.7 Reference Manual
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MySQL 5.7 Reference Manual  /  ...  /  The ucs2 Character Set (UCS-2 Unicode Encoding) The ucs2 Character Set (UCS-2 Unicode Encoding)

In UCS-2, every character is represented by a 2-byte Unicode code with the most significant byte first. For example: LATIN CAPITAL LETTER A has the code 0x0041 and it is stored as a 2-byte sequence: 0x00 0x41. CYRILLIC SMALL LETTER YERU (Unicode 0x044B) is stored as a 2-byte sequence: 0x04 0x4B. For Unicode characters and their codes, please refer to the Unicode Home Page.

In MySQL, the ucs2 character set is a fixed-length 16-bit encoding for Unicode BMP characters.

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