SQL與法中直接擷取字串的函式使用 substring(原字串, 啟始取值位置, 欲取的字元數)
這裡與DELPHI的Copy用法一摸摸一樣樣~
範例：取g.declno前兩字元
cntc.cntcid = substring(g.declno,1,2)
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