评估EMPLOYEE表的结构： EMPLOYEE_IDNUMBER（9） LAST_NAMEVARCHAR2（25） FIRST_NAMEVARCHAR2（25） DEPARTMENT_IDNUMBER（9） MANAGER_IDNUMBER（9） SALARYNUMBER（7，2） 您使用以下哪条语句可将LAST_NAME列（当前包含200条记录）的长度增加到35个字节（）A、ALTER employee TABLEAL TERCOLUMN（last_name VARCHAR2（35））B、ALTER TABLE employee RENAME last_name VARCHAR2（35）C、ALTER TABLE employee MODIFY（last_name VARCHAR2（35））D、不能增大LAST_NAME列的宽度
评估EMPLOYEE表的结构： EMPLOYEE_IDNUMBER（9） LAST_NAMEVARCHAR2（25） FIRST_NAMEVARCHAR2（25） DEPARTMENT_IDNUMBER（9） MANAGER_IDNUMBER（9） SALARYNUMBER（7，2） 您使用以下哪条语句可将LAST_NAME列（当前包含200条记录）的长度增加到35个字节（）
- A、ALTER employee TABLEAL TERCOLUMN（last_name VARCHAR2（35））
- B、ALTER TABLE employee RENAME last_name VARCHAR2（35）
- C、ALTER TABLE employee MODIFY（last_name VARCHAR2（35））
- D、不能增大LAST_NAME列的宽度
相关考题：
将zg表的职工号字段的宽度由7改为9，应使用SQL语句是( )。A．ALTER TABLE zg 职工号 WITH n(9)B．ALTER TABLE zg 职工号 n(9)C．ALTER TABLE zg ALTER 职工号n(9)D．ALTER zg ALTER 职工号 n(9)
“雇员”表在LAST_NAME列上有一个名为LN_IDX的索引。您要将此索引更改为FIRST_NAME列的索引。以下哪条SQL语句将实现此操作（）A、ALTER INDEX ln_idx ON employees（first_name）B、ALTER INDEX ln_idx TO employees（first_name）C、ALTER INDEX ln_idx TO fn_idx ON employees（first_name）D、以上都不能；您无法变更索引
评估EMPLOYEE表的结构： EMPLOYEE_IDNUMBER（9） LAST_NAMEVARCHAR2（25） FIRST_NAMEVARCHAR2（25） DEPARTMENT_IDNUMBER（9） MANAGER_IDNUMBER（9） SALARYNUMBER（7，2） EMPLOYEE_ID列当前包含500个雇员标识号。业务需求已发生变化，您需要允许用户在标识值中包含文本字符。应该使用哪条语句来更改该列的数据类型（）A、ALTER TABLE employee MODIFY（employee_id VARCHAR2（9））B、ALTER TABLE employee REPLACE（employee_id VARCHAR2（9））C、ALTER employee TABLEMODIFY COLUMN（employee_id VARCHAR2（15））D、您不能修改EMPLOYEE_ID列的数据类型，因为该表不为空
您在公司的数据库中成功创建了名为SALARY的表。您现在要通过向引用EMPLOYEES表的匹配列的SALARY表添加FOREIGNKEY约束条件来建立EMPLOYEES表与SALARY表之间的父/子关系。尚未向SALARY表添加任何数据。应执行以下哪条语句（）A、ALTER TABLE salary ADD CONSTRAINT fk_employee_id_01 FOREIGN KEY（employee_id）REFERENCES employees（employee_id）B、ALTER TABLE salary ADD CONSTRAINT fk_employee_id_ FOREIGN KEY BETWEEN salary（employee_id）AND employees（employee_id）C、ALTER TABLE salary FOREIGN KEY CONSTRAINT fk_employee_id_REFERENCES employees（employee_id）D、ALTER TABLE salary ADD CONSTRAINT fk_employee_id_FOREIGN KEY salary（employee_id）=employees（employee_id）
FACULTY表包含以下各列： FACULTYID VARCHAR2(5) NOT NULL PRIMARY KEY FIRST_NAME VARCHAR2(20) LAST_NAME VARCHAR2(20) ADDRESS VARCHAR2(35) CITY VARCHAR2(15) STATE VARCHAR2(2) ZIP NUMBER(9) TELEPHONE NUMBER(10) STATUS VARCHAR2(2) NOT NULL COURSE 表包含以下各列： COURSEID VARCHAR2(5) NOT NULL PRIMARY KEY SUBJECT VARCHAR2(5) TERM VARCHAR2(6 FACULTYID VARCHAR2(5) NOT NULL FOREIGN KEY 您需要制定一个报表，用于确定在下学期任教的所有副教授。您要创建一个视图来简化报表的创建过程。以下哪条CREATE VIEW语句将完成此任务（）A、CREATE VIEW（SELECT first_name，last_name，status，courseid，subject，term FROM faculty，course WHERE facultyid=facultyid）B、CREATE VIEW pt_view ON（SELEC Tfirst_name，last_name，status，courseid，subject，term FROM faculty f and coursec WHERE f.facultyid=c.facultyid）C、CREATE VIEW pt_view IN（SELECT first_name，last_name，status，courseid，subject，term FROM faculty course）D、CREATE VIEW pt_view AS（SELECT first_name，last_name，status，courseid，subject，term FROM facultyf，coursec WHERE f.facultyid=c.facultyid）
DEPARTMENT 表包含以下列： DEPT_ID NUMBER, Primary Key DEPT_ABBR VARCHAR2(4) DEPT_NAME VARCHAR2(30) MGR_ID NUMBER EMPLOYEE 表包含以下列： EMPLOYEE_ID NUMBER EMP_LNAME VARCHAR2(25) EMP_FNAME VARCHAR2(25) DEPT_ID NUMBER JOB_ID NUMBER MGR_ID NUMBER SALARY NUMBER(9,2) HIRE_DATE DATE 请评估以下语句： ALTER TABLE employee ADD CONSTRAINT REFERENTIAL (mgr_id) TO department(mgr_id); 是以下哪个说法（）A、ALTER TABLE语句创建从EMPLOYEE表到DEPARTMENT表的引用约束条件B、ALTER TABLE语句创建从DEPARTMENT表到EMPLOYEE表的引用约束条件C、ADD CONSTRAINT子句存在语法错误，因此ALTER TABLE语句将会失败D、ALTER TABLE语句执行成功，但不重新创建引用约束条件
“雇员”表包含以下列： EMPLOYEE_ID NOT NULL, Primary Key SSNUM NOT NULL, Unique LAST_NAME VARCHAR2(25) FIRST_NAME VARCHAR2(25) DEPARTMENT_ID NUMBER 部门表中 DEPARTMENT_ID 列的外键 SALARY NUMBER(8,2) 如果执行以下语句： CREATE INDEX emp_name_idx ON employees(last_name, first_name); 以下哪个说法是的（）A、此语句会创建一个基于函数的索引B、因为语法错误，此语句将失败C、该语句将创建一个组合唯一索引D、该语句将创建一个组合非唯一索引
TEAMS表包含以下各列： TEAM_ID NUMBER（4） Primary Key TEAM_NAMEVARCHAR2（20） MGR_ID NUMBER（9） TEAMS表当前是空表。您需要允许用户在经理标识值中包含文本字符。应使用以下哪条语句来执行此任务（）A、ALTER teams MODIFY（mgr_id VARCHAR2（15））B、ALTERTABLE teams MODIFY（mgr_idVARCHAR2（15））C、ALTERTABLE teams REPLACE（mgr_id VARCHAR2（15））D、ALTER teams TABLEMODIFYCOLUMN（mgr_id VARCHAR2（15））
Examine the structure of the EMPLOYEES table: EMPLOYEE_ID NUMBER Primary Key FIRST_NAME VARCHAR2(25) LAST_NAME VARCHAR2(25) HIRE_DATE DATE Which INSERT statement is valid?（）A、INSERT INTO employees (employee_id, first_name, last_name, hire_date) VALUES (1000, 'John', 'smith','01/01/01);B、INSERT INTO employees(employee_id, first_name, last_name, hire_date) VALUES (1000, 'John', 'smith','01 january 01');C、INSERT INTO employees(employee_id, first_name, last_name, Hire_date) VALUES (1000, 'John', 'smith', To_ date ('01/01/01));D、INSERT INTO employees(employee_id, first_name, last_name, hire_date) VALUES (1000, 'John', 'smith','01-Jan-01');
Examine the structure of the EMPLOYEES table: EMPLOYEE_ID NUMBER Primary Key FIRST_NAME VARCHAR2(25) LAST_NAME VARCHAR2(25) Which three statements inserts a row into the table? （）A、INSERT INTO employees VALUES (NULL, 'JOHN','Smith');B、INSERT INTO employees( first_name, last_name) VALUES ('JOHN','Smith');C、INSERT INTO employees VALUES ('1000','JOHN','NULL');D、INSERT INTO employees(first_name,last_name, employee_id) VALUES ('1000, 'john','Smith');E、INSERT INTO employees (employee_id) VALUES (1000);F、INSERT INTO employees (employee_id, first_name, last_name) VALUES ( 1000, 'john',");
The EMPLOYEES table contains these columns: EMPLOYEE_ID NUMBER(4) LAST_NAME VARCHAR2 (25) JOB_ID VARCHAR2(10) You want to search for strings that contain 'SA_' in the JOB_ID column. Which SQL statement do you use?（） A、SELECT employee_id, last_name, job_id FROM employees WHERE job_id LIKE '%SA/_%' ESCAPE '/';B、SELECT employee_id, last_name, job_id FROM employees WHERE job_id LIKE '%SA_';C、SELECT employee_id, last_name, job_id FROM employees WHERE job_id LIKE '%SA_' ESCAPE "/";D、SELECT employee_id, last_name, job_id FROM employees WHERE job_id = '%SA_';
Examine the structure of the EMPLOYEES and NEW_EMPLOYEES tables: EMPLOYEES EMPLOYEE_ID NUMBER Primary Key FIRST_NAME VARCHAR2(25) LAST_NAME VARCHAR2(25) HIRE_DATE DATE NEW_EMPLOYEES EMPLOYEE_ID NUMBER Primary Key NAME VARCHAR2 (60) Which DELETE statement is valid?（）A、DELETE FROM employees WHERE employee_id = (SELECT employee_id FROM employees);B、DELETE * FROM employees WHERE employee_id = (SELECT employee_id FROM new_ employees);C、DELETE FROM employees WHERE employee_id IN (SELECT employee_id FROM new_employees WHERE name = 'carrey');D、DELETE * FROM employees WHERE employee_id IN (SELECT employee_id FROM new_employees WHERE name = 'carrey');
Examine the structure of the EMPLOYEES table: EMPLOYEE_ID NUMBER Primary Key FIRST_NAME VARCHAR2(25) LAST_NAME VARCHAR2(25) HIRE_DATE DATE Which UPDATE statement is valid?（）A、UPDATE employees SET first_name = 'John' SET last_name ='Smith' WHERE employee_id = 180;B、UPDATE employees SET first_name = 'John', SET last_name ='Smith' WHERE employee_id = 180;C、UPDATE employees SET first_name = 'John' AND last_name ='Smith' WHERE employee_id = 180;D、UPDATE employees SET first_name = 'John', last_name ='Smith' WHERE employee_id = 180;
Examine the structure of the EMPLOYEES table: EMPLOYEE_ID NUMBER Primary Key FIRST_NAME VARCHAR2 (25) LAST_NAME VARCHAR2 (25) HIRE_DATE DATE Which UPDATE statement is valid? （）A、UPDATE employees SET first_name = 'John' SET last_name = 'Smith' WHERE employee_id = 180;B、UPDATE employees SET first_name = 'John', SET last_name = 'Smoth' WHERE employee_id = 180;C、UPDATE employee SET first_name = 'John' AND last_name = 'Smith' WHERE employee_id = 180;D、UPDATE employee SET first_name = 'John', last_name = 'Smith' WHERE employee_id = 180;
Examine the structure of the EMPLOYEES and NEW_EMPLOYEES tables: EMPLOYEES EMPLOYEE_ID NUMBER Primary Key FIRST_NAME VARCHAR2(25) LAST_NAME VARCHAR2(25) HIRE_DATE DATE NEW_EMPLOYEES EMPLOYEE_ID NUMBER Primary Key NAME VARCHAR2(60) Which DELETE statement is valid?（）A、DELETE FROM employees WHERE employee_id = (SELECT employee_id FROM employees);B、DELETE * FROM employees WHERE employee_id = (SELECT employee_id FROM new_employees);C、DELETE FROM employees WHERE employee_id IN (SELECT employee_id FROM new_employees WHERE name ='Carrey');D、DELETE * FROM employees WHERE employee_id IN (SELECT employee_id FROM new_employees WHERE last_name ='Carrey');
单选题DEPARTMENT 表包含以下列： DEPT_ID NUMBER, Primary Key DEPT_ABBR VARCHAR2(4) DEPT_NAME VARCHAR2(30) MGR_ID NUMBER EMPLOYEE 表包含以下列： EMPLOYEE_ID NUMBER EMP_LNAME VARCHAR2(25) EMP_FNAME VARCHAR2(25) DEPT_ID NUMBER JOB_ID NUMBER MGR_ID NUMBER SALARY NUMBER(9,2) HIRE_DATE DATE 请评估以下语句： ALTER TABLE employee ADD CONSTRAINT REFERENTIAL (mgr_id) TO department(mgr_id); 是以下哪个说法（）AALTER TABLE语句创建从EMPLOYEE表到DEPARTMENT表的引用约束条件BALTER TABLE语句创建从DEPARTMENT表到EMPLOYEE表的引用约束条件CADD CONSTRAINT子句存在语法错误，因此ALTER TABLE语句将会失败DALTER TABLE语句执行成功，但不重新创建引用约束条件
单选题“雇员”表包含以下列： EMPLOYEE_ID NOT NULL, Primary Key SSNUM NOT NULL, Unique LAST_NAME VARCHAR2(25) FIRST_NAME VARCHAR2(25) DEPARTMENT_ID NUMBER 部门表中 DEPARTMENT_ID 列的外键 SALARY NUMBER(8,2) 如果执行以下语句： CREATE INDEX emp_name_idx ON employees(last_name, first_name); 以下哪个说法是的（）A此语句会创建一个基于函数的索引B因为语法错误，此语句将失败C该语句将创建一个组合唯一索引D该语句将创建一个组合非唯一索引
单选题FACULTY表包含以下各列： FACULTYID VARCHAR2(5) NOT NULL PRIMARY KEY FIRST_NAME VARCHAR2(20) LAST_NAME VARCHAR2(20) ADDRESS VARCHAR2(35) CITY VARCHAR2(15) STATE VARCHAR2(2) ZIP NUMBER(9) TELEPHONE NUMBER(10) STATUS VARCHAR2(2) NOT NULL COURSE 表包含以下各列： COURSEID VARCHAR2(5) NOT NULL PRIMARY KEY SUBJECT VARCHAR2(5) TERM VARCHAR2(6 FACULTYID VARCHAR2(5) NOT NULL FOREIGN KEY 您需要制定一个报表，用于确定在下学期任教的所有副教授。您要创建一个视图来简化报表的创建过程。以下哪条CREATE VIEW语句将完成此任务（）ACREATE VIEW（SELECT first_name，last_name，status，courseid，subject，term FROM faculty，course WHERE facultyid=facultyid）BCREATE VIEW pt_view ON（SELEC Tfirst_name，last_name，status，courseid，subject，term FROM faculty f and coursec WHERE f.facultyid=c.facultyid）CCREATE VIEW pt_view IN（SELECT first_name，last_name，status，courseid，subject，term FROM faculty course）DCREATE VIEW pt_view AS（SELECT first_name，last_name，status，courseid，subject，term FROM facultyf，coursec WHERE f.facultyid=c.facultyid）
单选题Examine the structure of the EMPLOYEES and NEW_EMPLOYEES tables: EMPLOYEES EMPLOYEE_ID NUMBER Primary Key FIRST_NAME VARCHAR2(25) LAST_NAME VARCHAR2(25) HIRE_DATE DATE NEW_EMPLOYEES EMPLOYEE_ID NUMBER Primary Key NAME VARCHAR2 (60) Which DELETE statement is valid?（）ADELETE FROM employees WHERE employee_id = (SELECT employee_id FROM employees);BDELETE * FROM employees WHERE employee_id = (SELECT employee_id FROM new_ employees);CDELETE FROM employees WHERE employee_id IN (SELECT employee_id FROM new_employees WHERE name = 'carrey');DDELETE * FROM employees WHERE employee_id IN (SELECT employee_id FROM new_employees WHERE name = 'carrey');
单选题The EMPLOYEES table contains these columns: EMPLOYEE_ID NUMBER(4) LAST_NAME VARCHAR2 (25) JOB_ID VARCHAR2(10) You want to search for strings that contain 'SA_' in the JOB_ID column. Which SQL statement do you use?（）ASELECT employee_id, last_name, job_id FROM employees WHERE job_id LIKE '%SA/_%' ESCAPE '/';BSELECT employee_id, last_name, job_id FROM employees WHERE job_id LIKE '%SA_';CSELECT employee_id, last_name, job_id FROM employees WHERE job_id LIKE '%SA_' ESCAPE /;DSELECT employee_id, last_name, job_id FROM employees WHERE job_id = '%SA_';
多选题Examine the structure of the EMPLOYEES table: EMPLOYEE_ID NUMBER Primary Key FIRST_NAME VARCHAR2(25) LAST_NAME VARCHAR2(25) Which three statements insert a row into the table? （）AINSERT INTO employees VALUES ( NULL, 'John', 'Smith');BINSERT INTO employees( first_name, last_name) VALUES( 'John', 'Smith');CINSERT INTO employees VALUES ( '1000', 'John', NULL);DINSERT INTO employees (first_name, last_name, employee_id) VALUES ( 1000, 'John', 'Smith');EINSERT INTO employees (employee_id) VALUES (1000);FINSERT INTO employees (employee_id, first_name, last_name) VALUES ( 1000, 'John', ' ');
单选题评估EMPLOYEE表的结构： EMPLOYEE_IDNUMBER（9） LAST_NAMEVARCHAR2（25） FIRST_NAMEVARCHAR2（25） DEPARTMENT_IDNUMBER（9） MANAGER_IDNUMBER（9） SALARYNUMBER（7，2） EMPLOYEE_ID列当前包含500个雇员标识号。业务需求已发生变化，您需要允许用户在标识值中包含文本字符。应该使用哪条语句来更改该列的数据类型（）AALTER TABLE employee MODIFY（employee_id VARCHAR2（9））BALTER TABLE employee REPLACE（employee_id VARCHAR2（9））CALTER employee TABLEMODIFY COLUMN（employee_id VARCHAR2（15））D您不能修改EMPLOYEE_ID列的数据类型，因为该表不为空
单选题Examine the structure of the EMPLOYEES table: EMPLOYEE_ID NUMBER Primary Key FIRST_NAME VARCHAR2 (25) LAST_NAME VARCHAR2 (25) HIRE_DATE DATE Which UPDATE statement is valid?（）AUPDATE employees SET first_name = 'John' SET last_name = 'Smith' WHERE employee_id = 180;BUPDATE employees SET first_name = 'John', SET last_name = 'Smoth' WHERE employee_id = 180;CUPDATE employee SET first_name = 'John' AND last_name = 'Smith' WHERE employee_id = 180;DUPDATE employee SET first_name = 'John', last_name = 'Smith' WHERE employee_id = 180;
单选题评估EMPLOYEE表的结构： EMPLOYEE_IDNUMBER（9） LAST_NAMEVARCHAR2（25） FIRST_NAMEVARCHAR2（25） DEPARTMENT_IDNUMBER（9） MANAGER_IDNUMBER（9） SALARYNUMBER（7，2） 您使用以下哪条语句可将LAST_NAME列（当前包含200条记录）的长度增加到35个字节（）AALTER employee TABLEAL TERCOLUMN（last_name VARCHAR2（35））BALTER TABLE employee RENAME last_name VARCHAR2（35）CALTER TABLE employee MODIFY（last_name VARCHAR2（35））D不能增大LAST_NAME列的宽度
单选题Examine the structure of the EMPLOYEES table: EMPLOYEE_ID NUMBER Primary Key FIRST_NAME VARCHAR2(25) LAST_NAME VARCHAR2(25) HIRE_DATE DATE Which UPDATE statement is valid?（）AUPDATE employees SET first_name = 'John' SET last_name ='Smith' WHERE employee_id = 180;BUPDATE employees SET first_name = 'John', SET last_name ='Smith' WHERE employee_id = 180;CUPDATE employees SET first_name = 'John' AND last_name ='Smith' WHERE employee_id = 180;DUPDATE employees SET first_name = 'John', last_name ='Smith' WHERE employee_id = 180;
单选题Examine the structure of the EMPLOYEES table: EMPLOYEE_ID NUMBER Primary Key FIRST_NAME VARCHAR2(25) LAST_NAME VARCHAR2(25) HIRE_DATE DATE Which INSERT statement is valid?（）AINSERT INTO employees (employee_id, first_name, last_name, hire_date) VALUES (1000, 'John', 'smith','01/01/01);BINSERT INTO employees(employee_id, first_name, last_name, hire_date) VALUES (1000, 'John', 'smith','01 january 01');CINSERT INTO employees(employee_id, first_name, last_name, Hire_date) VALUES (1000, 'John', 'smith', To_ date ('01/01/01));DINSERT INTO employees(employee_id, first_name, last_name, hire_date) VALUES (1000, 'John', 'smith','01-Jan-01');
单选题Examine the structure of the EMPLOYEES and NEW_EMPLOYEES tables: EMPLOYEES EMPLOYEE_ID NUMBER Primary Key FIRST_NAME VARCHAR2(25) LAST_NAME VARCHAR2(25) HIRE_DATE DATE NEW_EMPLOYEES EMPLOYEE_ID NUMBER Primary Key NAME VARCHAR2(60) Which DELETE statement is valid?（）ADELETE FROM employees WHERE employee_id = (SELECT employee_id FROM employees);BDELETE * FROM employees WHERE employee_id = (SELECT employee_id FROM new_employees);CDELETE FROM employees WHERE employee_id IN (SELECT employee_id FROM new_employees WHERE name ='Carrey');DDELETE * FROM employees WHERE employee_id IN (SELECT employee_id FROM new_employees WHERE last_name ='Carrey');