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C R U D: Ôöɾ¸Ä²é
table :  name  age  score
desc+±íÃû    ---> ²éѯ±í½á¹¹
»òÕßÓà describe ÃüÁî (descÊÇdescribeµÄ¼òд)
²éѯÓïÑÔ£ºSELECT [DISTINCT] {*,column[alias],...} from table;
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Oracle Function


CREATE OR REPLACE FUNCTION OFFICE.fbill_getbalance (billid NUMBER, total NUMBER)
   RETURN NUMBER
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   paid      NUMBER;
   balance   NUMBER;
BEGIN
   balance := total;
--get total paid
   SELECT SUM (n_paidamount)
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