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全部博文（487）
发布时间：2019-02-22 10:54:42
31.choose the best answerWhich statement is true regarding the USING clause in table joins?A) It can be used to access data from tables through equijoins as well as nonequijoins.B) It can be used to join tables that have columns with the same name and compatible data types.C) It can be u.........【阅读全文】
发布时间：2019-02-22 10:24:13
30.choose the best answerExamine the commands used to create DEPARTMENT_DETAILS and COURSE_DETAILS:SQL> CREATE TABLE DEPARTMENT_DETAILS(DEPARTMENT_ID NUMBER PRIMARY KEY,DEPARTMENT_NAME VARCHAR2(50) ,HOD VARCHAR2(50));SQL> CREATE TABLE COURSE_DETAILS(COURSE_ID NUMBER PRIMARY KEY,.........【阅读全文】
发布时间：2019-02-22 09:54:06
29.choose the best answerEvaluate the following query:SQL> SELECT promo_name || q'{'s start date was \}' || promo_begin_dateAS "Promotion Launches"FROM promotions;What would be the outcome of the above query?A) It produces an error because the data types are not matching.B) It e.........【阅读全文】
发布时间：2019-02-21 11:38:29
28.choose the best answerEvaluate the following SQL statement:SQL> SELECT promo_id, promo_categoryFROM promotionsWHERE promo_category = 'Internet' ORDER BY 2 DESCUNIONSELECT promo_id, promo_categoryFROM promotionsWHERE promo_category = 'TV'UNIONSELECT promo_id, promo_ca.........【阅读全文】
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】
