ASCII and CHAR functions

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SQL Problems and solutions S. I. Moiseenko

	Transact-SQL string and datetime functions String functions in MS SQL SERVER ASCII and CHAR functions
	Let's start from two reciprocally related functions - ASCII and CHAR. The ASCII function returns an ASCII code value of the leftmost character of a character expression, being a function argument. Here is an example of the way to determine how many different letters which the names of the ships in the Ships table start from are: Console Execute SELECT COUNT(DISTINCT ASCII(name)) FROM Ships SELECT COUNT(DISTINCT ASCII(name)) FROM Ships Scheme The result is 11. To find out what these letters are, we can use CHAR function that returns a character by a known ASCII code value (from 0 to 255): Console Execute SELECT DISTINCT CHAR(ASCII(name)) FROM Ships ORDER BY 1 SELECT DISTINCT CHAR(ASCII(name)) FROM Ships ORDER BY 1 Scheme We should note that the identical result can be got simpler using one more function - LEFT. string functions ASCII CHAR

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aggregate functions ALL ASCII AVG Battles Bezhaev Bismarck C.J.Date Cartesian product CASE cast CHAR CHARINDEX classes COALESCE common table expressions comparison predicates Computer firm CONVERT correlated subqueries COUNT CTE data type conversion database schema DATEDIFF DATEPART DATETIME DELETE DISTINCT EXCEPT exercise (-2) exercise 19 exercise 23 exercise 37 exercise 39 exercise 46 exercise 54 exercise 55 exercise 56 exercise 57 exercise 7 exercise 70 exercise 8 exercises EXISTS FROM FULL JOIN GROUP BY grouping Guadalcanal More tags

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SQL Problems and solutions