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ORACLE PL/SQL ¶ÔÏó(object)ѧϰ±Ê¼Ç(Ò»)

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CREATE [OR REPLACE] TYPE [schema.] type_name
[AUTHID {CURRENT_USER|DEFINER}] AS OBJECT (
Attribute1 datatype,
[attribute2 datatype,…]
[method 1]
[method 2]);
/

 
 
 
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ORACLE PL/SQL ¶ÔÏó(object)ѧϰ±Ê¼Ç(Èý)

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SQLÓï¾äPART2

Subquery: (single-row subqueries and multi-rows subqueries).
select select_list
from table
where expr operator (select select_list from table);
single-row subqueries operator: =, >, >=, <, <=, <>
e.g.:
1. select department_id, min(salary) from employees group by department_id ......

Oracle¡¢SQL Server¡¢AccessÊý¾Ý¿â¸ßЧ¹û·ÖÒ³¼¼ÇÉ

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