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SUBSTRING
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Syntax
SUBSTRING(input,start[,length])
Returns the portion of input starting at the character at start_int (where 0 is the first character). If length_int is specified and is greater than zero, only length_int characters of the string will be returned.
If any of the arguments is NULL, the result will be NULL. If the substring requested doesn't fall entirely within the string, an error will be returned.
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