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发布时间:2019-12-17 09:58:46

The ORDERS table has a primary key constraint on the ORDER_ID column.The constraint is defined with on DELETE CASCADE.Which three DELETE statements execute successfully?B) DELETE * FROM orders WHERE order_total<1000;D) DELETE FROM orders;Answer:ACD......【阅读全文】

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发布时间:2019-12-16 15:04:35

Which two statements are true about single row functions?B) MOD : returns the quotient of a division operationD) FLOOR : returns the smallest integer greater than or equal to a specified numberAnswer::CEceil 函数向上取整数。SQL> select ceil(-500.1) from dual;------------.........【阅读全文】

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发布时间:2019-12-16 13:26:53

Exanine the desatption of the BOOKS_TRANSACTIONS table----------------------------------------------------------------------------------------------TRANSACTION_TYPE                    VARCHAR2(3)BOOK_ID         .........【阅读全文】

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发布时间:2019-11-27 09:44:09

Examine the description of the PRODUCT_INFORMATION table:------------------------------------------------------------------------PROD_NANE           VARCRAR2 (10)Which query retrieves the number of products with a null list price?B) SELECT Count(nvl( l.........【阅读全文】

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发布时间:2019-11-25 10:17:30

Which three statements are true about sequences in a single instance Orade database?B) Two or more tables cannot have keys generated from the same sequence.D) A sequence can issue duplicate values.F) A sequence can only be dropped by a DBA.(解析:虚拟可以一下子产生一组的数字缓存在.........【阅读全文】

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