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全部博文（487）
发布时间：2019-02-20 16:14:50
23.choose the best answerView the Exhibits and examine PRODUCTS and SALES tables.You issue the following query to display product name and the number of times theproduct has been sold:SQL>SELECT p.prod_name, i.item_cntFROM (SELECT prod id, COUNT(*) item_cntFROM sales GROUP BY prod_.........【阅读全文】
发布时间：2019-02-20 15:31:30
Evaluate the following CREATE SEQUENCE statement:START WITH 100MAXVALUE 200NOCACHE;You issue the following SQL statement:What is displayed by the SELECT statement?B) 100D) 10Answer：B......【阅读全文】
发布时间：2019-02-20 13:53:12
View the Exhibit and examine the description of SALES and PROMOTIONS tables. A) DELETEWHERE promo_id = (SELECT promo_idWHERE promo_name = 'blowout sale')FROM promotions FROM salesFROM promotionsAND promo_id = (SELECT promo_idWHERE promo_name = 'eve.........【阅读全文】
发布时间：2019-02-19 11:51:23
20.choose twoExamine the description of the EMP_DETAILS table given below:Which two statements are true regarding SQL statements that can be executed on the EMP_DETAIL table?A) You cannot add a new column to the table with LONG as the data type.B) An EMP_IMAGE column can be included .........【阅读全文】
发布时间：2019-02-19 10:53:58
1.choose the best answerWhat is the primary difference between the relational database (RDB) andobject-oriented database (OODB) models?A) RDB allows the definition of relationships between different tables, whereas OODBdoes not allow this.B) OODB incorporates methods with data structure definit.........【阅读全文】
