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CREATE OR REPLACE TYPE Obj1 AS OBJECT (
f1 NUMBER,
f2 VARCHAR2(10),
f3 DATE
);
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CREATE OR REPLACE TYPE Obj2 AS OBJECT (
f1 DATE,
f2 CHAR(1)
);
/
CREATE OR REPLACE TYPE Obj3 AS OBJECT (
a Obj1,
b Obj2
);
/
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Merge statement
function benefits: 1) provides the ability to conditionally update, insert or delete data into a database table. 2) performs an update if the row exists, and an insert if it is a new row. --> 1) avoids seperate updates, 2) increase performance and ease of use. 3) is useful in dat ......
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--> Title : SQL ServerϵͳÊÓͼ
--> Author : wufeng4552
--> Date : 2009-10-28
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