Oracle 中 using的用法问题1.SELECT e.last_name,d.department_name,d.location_idFROM employees e JOIN departments dUSING (department_id );里面using （department_id 2Q:In which three cases would you use the USING clause?(Choose three.)A.You want

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Oracle 中 using的用法问题1.SELECT e.last_name,d.department_name,d.location_idFROM employees e JOIN departments dUSING (department_id );里面using （department_id 2Q:In which three cases would you use the USING clause?(Choose three.)A.You want
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Oracle 中 using的用法问题1.SELECT e.last_name,d.department_name,d.location_idFROM employees e JOIN departments dUSING (department_id );里面using （department_id 2Q:In which three cases would you use the USING clause?(Choose three.)A.You want
Oracle 中 using的用法问题
1.
SELECT e.last_name,d.department_name,d.location_id
FROM employees e JOIN departments d
USING (department_id );
里面using （department_id
2Q:In which three cases would you use the USING clause?(Choose three.)
A.You want to create a nonequijoin.
B.The tables to be joined have multiple NULL columns.
C.The tables to be joined have columns of the same name and different data types.
D.The tables to be joined have columns with the same name and compatible data types.
E.You want to use a NATURAL join,but you want to restrict the number of columns in the join condition.
能举例说明下吗?

Oracle 中 using的用法问题1.SELECT e.last_name,d.department_name,d.location_idFROM employees e JOIN departments dUSING (department_id );里面using （department_id 2Q:In which three cases would you use the USING clause?(Choose three.)A.You want
1.相当于 on e.department_id = d.department_id
即通过该字段将两个表关连
2.BDE

Oracle 中 using的用法问题1.SELECT e.last_name,d.department_name,d.location_idFROM employees e JOIN departments dUSING (department_id );里面using （department_id 2Q:In which three cases would you use the USING clause?(Choose three.)A.You want oracle中 between 用法 Oracle Hint的用法 谁能把oracle中commit的作用和用法详细介绍一下 关于C#中using的用法我在TCP服务器编程中看到了using这样的用发 using(FileStream stream=fileInfo.OpenRead())这里用using oracle中in和exist的区别 oracle中逻辑读的单位是什么? Oracle 中 any 和 all 的区别 oracle中trunc(sysdate-1)是什么意思 oracle的bigfile是什么意思?oracle数据库中建立表空间,加入bigfile是什么意思?create bigfile tablespace oracle中decode的用法,详细介绍下么,(decode(a.mmail_no ,0 ,0 ,(a.amount + a.disc_amount) *(1 + t.vat_perc / 100)))这句话我看好长时间了没看懂. oracle exp和imp问题我从oracle 中exp出来一个表A的全部数据,在导入的时候能不能导入到另外一个表B中,A和B的结构什么都相同!如果可以请写下imp的语句,1楼的对我,不太可行,其实这两个表是在一个 oracle 中 FETCH oracle中escape是什么意思 oracle中cascade是什么意思 oracle中procedures是什么意思 oracle sql 语句中where条件中 1=1 在oracle中创建表的时候number(8,