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全部博文（487）
发布时间：2019-02-27 11:09:11
Which three tasks can be performed by DDL statements?B) modifying a table to prevent data that violate certain conditions from being entered in a columnD) creating multiple savepoints to enable partial rollback of a transactionAnser：BCE......【阅读全文】
发布时间：2019-02-27 10:32:50
Which statement is true about the Oracle SQL, DELETE and TRUNCATE statements?B) DELETE and TRUNCATE statements can have a rollback done to restore data into a table.D) DELETE but not TRUNCATE statement can be used to selectively remove rows from a table.Answer：D(解析：Truncate 是.........【阅读全文】
发布时间：2019-02-27 09:47:30
View the Exhibit and examine the structure of the ORDERS table.The columns ORDER_MODE and ORDER_TOTAL have the default values 'direct' and 0 respectively.(SELECT order_id,order_date,customer_id FROM orders)(order_id,order_date,order_mode,VALUES(1,TO_DATE(NULL), 'online', 10.........【阅读全文】
发布时间：2019-02-26 17:05:11
Which two statements are true regarding views? (Choose two.)B) The OR REPLACE option is used to change the definition of an existing view without dropping and re-creating it.D) Rows added through a view are deleted from the table automatically when the view is dropped.F) A subquery use.........【阅读全文】
发布时间：2019-02-26 16:34:19
39.choose the best answerView the Exhibit and examine the description of the EMPLOYEES table.You want to calculate the total remuneration for each employee. Total remuneration is the sum of the annual salary and the percentage commission earned for a year.Only a few employees earn commission..........【阅读全文】
