July 2010
Intermediate to advanced
840 pages
16h 33m
English
Content preview from Joe Celko's SQL for Smarties, 3rd Edition
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10.3. IS [NOT] NORMALIZED Predicate
<string> IS [NOT] NORMALIZED determines whether a Unicode string is one of the four normal forms (D, C, KD, or KC). The use of the words “normal form” here are not the same as in a relational context. In the Unicode model, a single character can be built from several other characters. Accent marks can be put on basic Latin letters. Certain combinations of letters can be displayed as ligatures (‘æ’ becomes ‘Ê’). Some languages, such as Hangul (Korean) and Vietnamese, build glyphs from concatenating symbols in two dimensions. Some languages have special forms of one letter that are determined by context, such as the terminal sigma in Greek or accented ‘u’ in Czech. In short, writing is more complex than just ...
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