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全部博文（487）
发布时间：2019-02-21 11:02:36
27.choose twoThe SQL statements executed in a user session are as follows:SQL> CREATE TABLE product(pcode NUMBER(2),pname VARCHAR2(10));SQL> INSERT INTO product VALUES (1, 'pen');SQL> INSERT INTO product VALUES (2,'pencil');SQL> SAVEPOINT a;SQL> UPDATE product SET pcode = 10 .........【阅读全文】
发布时间：2019-02-21 10:22:36
26.choose twoExamine the structure of the PRODUCTS table.Which two statements are true?A) EXPIRY_DATE always stores date and time in character formatB) PRICE can store a maximum of eight digits and two decimals.C) PRODUCT_PIC can store only videos.D) PRODUCT_NAME always stores .........【阅读全文】
发布时间：2019-02-21 09:44:50
25. choose the best answerEvaluate the following SQL statement:ALTER TABLE hr.empSET UNUSED (mgr_id);Which statement is true regarding the effect of the above SQL statement?A) Any views created on the EMP table that include the MGR_ID column would be automatically modified and remain .........【阅读全文】
发布时间：2019-02-20 17:27:37
24. choose the best answerIn the EMPLOYEES table there are 1000 rows and employees are working in the company for more than 10 years.Evaluate the following SQL statement:SQL> UPDATE employeesSET salary = NVL(salary,0) + NVL(comm,0),comm = NVL(comm,0)WHERE hire_date < SYSDATE - 600;.........【阅读全文】
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】
