sql substr function is the abbreviated form of substr, In MySQL for example these are the options:
where str is the string, pos the starting poisition and len the length of the substring retrived by the function.
substr(str,pos) substr(str FROM pos) substr(str, pos. len) substr(str FROM pos FOR len)
where str is the string, pos the starting poisition and len the length of the substring retrived by the function.
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