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全部博文（488）
发布时间：2019-02-28 09:33:02
View the Exhibit and examine the data in the EMPLOYEES table.You want to generate a report showing the total compensation paid to each employee to date(迄今为止支付给每位员工的总补偿).SQL>SELECT ename ||' joined on '|| hiredate ||TO_CHAR(ROUND(ROUND(SYSDATE-hiredate)/365) * sal + comm).........【阅读全文】
发布时间：2019-02-27 11:42:10
View the Exhibit and examine the details of the ORDER_ITEMS table.Evaluate the following SQL statements:SELECT MAX(unit_price*quantity) "Maximum Order"Statement 2:FROM order_itemsWhich statements are true regarding the output of these SQL statements? (Choose all that apply.).........【阅读全文】
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】
