[每日一题] OCP1z0-047 :2013-08-09 非相关子查询的定义................................................29
2013-08-10 00:08
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正解答案:D 非相关子查询是独立于外部查询的子查询,子查询总共执行一次,执行完毕后将值传递给外部查询。明确in常用语非相关子查询,当然也可以用于相关子查询,exists,not exists常用于相关子查询。非相关子查询实验测试:非相关子查询实验1
非相关子查询实验2
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正解答案:D 非相关子查询是独立于外部查询的子查询,子查询总共执行一次,执行完毕后将值传递给外部查询。明确in常用语非相关子查询,当然也可以用于相关子查询,exists,not exists常用于相关子查询。非相关子查询实验测试:非相关子查询实验1
非相关子查询实验2
开高级计划看:
hr@MYDB> ALTER SESSION SET STATISTICS_LEVEL=ALL; Session altered. hr@MYDB> SELECT * FROM employees WHERE job_id in 2 ( SELECT job_id FROM jobs WHERE min_salary > 10000 ); hr@MYDB> SELECT * FROM TABLE(DBMS_XPLAN.DISPLAY_CURSOR(NULL,NULL,'ALLSTATS LAST'));
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