What is collation UTF-8 general CI?

What is collation UTF-8 general CI?

In general, utf8_general_ci is faster than utf8_unicode_ci, but less correct. utf8_unicode_ci also supports contractions and ignorable characters. utf8_general_ci is a legacy collation that does not support expansions, contractions, or ignorable characters. It can make only one-to-one comparisons between characters.

What is difference between UTF-8 and utf16?

UTF-8 uses one byte at the minimum in encoding the characters while UTF-16 uses minimum two bytes. In short, UTF-8 is variable length encoding and takes 1 to 4 bytes, depending upon code point. UTF-16 is also variable length character encoding but either takes 2 or 4 bytes.

How can you tell the difference between text UTF and Unicode?

UTF-8 is an encoding used to translate numbers into binary data. Unicode is a character set used to translate characters into numbers.

What MySQL collation should I use?

It is best to use character set utf8mb4 with the collation utf8mb4_unicode_ci . The character set, utf8 , only supports a small amount of UTF-8 code points, about 6% of possible characters. utf8 only supports the Basic Multilingual Plane (BMP).

Does MySQL support UTF-8?

MySQL supports multiple Unicode character sets: utf8mb4 : A UTF-8 encoding of the Unicode character set using one to four bytes per character. utf8mb3 : A UTF-8 encoding of the Unicode character set using one to three bytes per character.

What is the difference between Unicode and UTF-8?

Unicode is the standard that maps characters to codepoints. Each character has a unique codepoint (identification number), which is a number like 9731. UTF-8 is an the encoding of the codepoints. In order to store all characters on disk (in a file), UTF-8 splits characters into up to 4 octets (8-bit sequences) – bytes.

What is UTF-8 mapping?

UTF-8 is a mapping method the retains compatibility with the older ASCII. 3. UTF-8 is the most space efficient mapping method for Unicode compared to other encoding methods. 4. UTF-8 is the most used Unicode standard for the web.

What are the first three bytes in a UTF-8 file?

If the UTF-16 Unicode byte order mark (BOM, U+FEFF) character is at the start of a UTF-8 file, the first three bytes will be 0xEF, 0xBB, 0xBF. The Unicode Standard neither requires nor recommends the use of the BOM for UTF-8, but warns that it may be encountered at the start of a file trans-coded from another encoding.

What is the overlong character in UTF 8?

Overlong encodings. Modified UTF-8 uses the two-byte overlong encoding of U+0000 (the NUL character ), 11000000 10000000 (hexadecimal C0 80 ), instead of 00000000 (hexadecimal 00 ). This allows the byte 00 to be used as a string terminator .