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Returns the character with the ASCII value of a number.
CHAR( integer-expression )
The number to be converted to an ASCII character. The number must be in the range 0 to 255, inclusive.
The character returned corresponds to the supplied numeric expression in the current database character set, according to
a binary sort order.
CHAR returns NULL for integer expressions with values greater than 255 or less than zero.
The following statement returns the value Y:
SELECT CHAR( 89 );