ASCII

ASCII returns the numerical value of an ASCII character.

Syntax

ASCII (expression)

Remarks

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If you pass a NULL string to this function, it returns 0.

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If the string is empty, this function returns 0.

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Any character outside the range 0 to 255 is returned as an error or ignored, depending on the implementation of RDBMS.

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If expression is a string with more than one character, only the first character is considered.

Example

SELECT ASCII ('a') AS lowercase_a,

ASCII('A') AS uppercase_a