db2 digits函数
The DIGITS function returns a character-string representation of a number.The argument must be an expression that returns a value of type SMALLINT, INTEGER, BIGINT or DECIMAL.
If the argument can be null, the result can be null; if the argument is null, the result is the null value.
The result of the function is a fixed-length character string representing the absolute value of the argument without regard to its scale. The result does not include a sign or a decimal character. Instead, it consists exclusively of digits, including, if necessary, leading zeros to fill out the string. The length of the string is:
·5 if the argument is a small integer
·10 if the argument is a large integer
·19 if the argument is a big integer
·p if the argument is a decimal number with a precision of p.
digits函数返回一个代表数字的字符串。
参数必须是一个表达式 ，返回整形，samllint,integer,bigint or decimal.
如果参数可能是空的，结果也可能是空的。如果参数是空的 ，记过肯定是空的。
函数的返回值是没有考虑参数的规格代表他的绝对值的固定长度的字符串，
返回值不包括符号或者小数字符。 相反 他包括数字 ，如有必要 前导为零来填充。
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