UNICODE and NCHAR functions

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SQL Problems and solutions S. I. Moiseenko

	Transact-SQL string and datetime functions String functions in MS SQL SERVER UNICODE and NCHAR functions
	UNICODE(ncharacter_expression) returns the Unicode value for the first character of the input expression. NCHAR(integer) returns a character with the given integer Unicode value. There are few examples. Console Execute SELECT ASCII('а'), UNICODE('а') SELECT ASCII('а'), UNICODE('а') Scheme No scheme returns the ASCII-code value and the Unicode value of the Russian letter "а": 224 and 1072. Console Execute SELECT CHAR(ASCII('а')), CHAR(UNICODE('а')) SELECT CHAR(ASCII('а')), CHAR(UNICODE('а')) Scheme No scheme Here we try to recover a symbol by its code value. We get "а" and NULL. The NULL-value returns because the 1072 code value is absent in the usual code table. Console Execute SELECT CHAR(ASCII('а')), NCHAR(UNICODE('а')) SELECT CHAR(ASCII('а')), NCHAR(UNICODE('а')) Scheme No scheme Now it's all right, "a" in both cases. Finally, Console Execute SELECT NCHAR(ASCII('а')) SELECT NCHAR(ASCII('а')) Scheme No scheme will give "à", because the Unicode value 224 exactly corresponds to this letter. string functions UNICODE NCHAR

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SQL Problems and solutions