PL/SQL
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SUBSTR
关于SUBSTR的官方解释！[@more@]SUBSTRSyntaxsubstr::= Text description of substrPurposeThe "substring" functions return a portion of string, beginning at character position, substring_length characters long. SUBSTR calculates lengths using characters as defined by the input character set. SUBSTRB uses bytes instead of characters. SUBSTRC uses Unicode complete characters. SUBSTR2 uses UCS2 codepoints. SUBSTR4 uses UCS4 codepoints.If position is 0, then it is treated as 1. If position is p
