在Oracle中,有一个名为seq的序列对象,假定此时查看seq序列当前值显示为7,那么执行下面的sql insert into stu(id, name) values(seq.NEXTVAL,’tom’ );很不幸,这个insert没有执行成功,随后马上执行rollback,问:此时查看seq序列当前值显示为()A、 6B、8C、7D、不能确定

在Oracle中,有一个名为seq的序列对象,假定此时查看seq序列当前值显示为7,那么执行下面的sql insert into stu(id, name) values(seq.NEXTVAL,’tom’ );很不幸,这个insert没有执行成功,随后马上执行rollback,问:此时查看seq序列当前值显示为()

  • A、 6
  • B、8
  • C、7
  • D、不能确定

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设有关系模式:student(sno, sname, age, dept),现利用命令: CREATE VIEW stu AS SELECT *FROM student WHERE dept="cs"WITH CHECK OPTION 创建了一个视图。则以下SQl命令中能正确执行的是A.UPDATE stu SET dept="maths"B.UPDATE stu SET dept="maths"WHERE age>=20C.INSERT INTO stu VALUES ("2004001", "John", 30, "cs")D.INSERT INTO stu VALUES ("2004001", "John", 50, "maths")

Python标准库random中的sample(seq,k)方法作用是从序列中选择________(重复?不重复?)的k个元素。

在Oracle中,用以下SQL命令创建了一个序列:CREATE SEQUENCEmy_seq START WITH 394 INCREMENT BY 12 NOMINVALUE NOMAXVALUE NOCYCLENOCACHE;用户执行包含my_seq.NEXTVAL的SQL语句三次,然后执行包含my_seq.CURRVAL的SQL语句四次,请问序列my_seq的当前值是() A.406B.418C.430D.442

有如下关系:课程表C,主键为c-id (char (4))。若用如下语句建立成绩表SC: CREATE TABLE SC(s-id char(6)NOT NULL,c-id char(4)NOT NULL,score Inteeer), 其中s-id为主键,c-id为外键(是C表的主键)。当执行如下语句肘,( )语句不能执行。A.INSERT SC VALUES('990101','NULL',75)B.INSERT SC VALUES('990203','C601',80)C.INSERT SC VALUES(NULL,'C602',93)D.INSERT SC VALUES('990202','C604',NULL)

oracle关联查询题目1数据库中有3 个表 teacher 表,student 表,tea_stu 关系表。teacher 表 teaID name agestudent 表 stuID name ageteacher_student 表 teaID stuID要求用一条sql 查询出这样的结果1.显示的字段要有老师name, age 每个老师所带的学生人数2 只列出老师age 为40 以下学生age 为12 以上的记录预备知识:1.sql 语句是对每一条记录依次处理,条件为真则执行动作(select,insert,delete,update)2.只要是迪卡尔积,就会产生“垃圾”信息,所以,只要迪卡尔积了,我们首先就要想到清除“垃圾”信息实验准备:drop table if exists tea_stu;drop table if exists teacher;drop table if exists student;create table teacher(teaID int primary key,name varchar(50),age int);create table student(stuID int primary key,name varchar(50),age int);create table tea_stu(teaID int references teacher(teaID),stuID int references student(stuID));insert into teacher values(1,'zxx',45), (2,'lhm',25) , (3,'wzg',26) , (4,'tg',27);insert into student values(1,'wy',11), (2,'dh',25) , (3,'ysq',26) , (4,'mxc',27);insert into tea_stu values(1,1), (1,2), (1,3);insert into tea_stu values(2,2), (2,3), (2,4);insert into tea_stu values(3,3), (3,4), (3,1);insert into tea_stu values(4,4), (4,1), (4,2) , (4,3);结果:2_3,3_2,4_3

有如下关系:课程表C,主键为c-id(char(4))。c-id c-name若用如下语句建立成绩表SC: CREATE TABLE SC(s-id char(6)NOT NULL,c-id char(4)NOT NULL,score Integer),其中s-id为主键,c-id为外键(是C表的主键)。当执行如下语句时,哪个语句不能执行? ( )。A.INSERT SC VALUES('990101','NULL',75)B.INSERT SC VALUES('990203','C601',80)C.INSERT SC VALUES(NULL,'C602',93)D.INSERT SC VALUES('990202','C604',NULL)

主机甲向主机乙发送一个TCP报文段,SYN字段为1,序列号字段的值为2000,若主机乙同意建立连接,则发送给主机甲的报文段可能为( ),若主机乙不同意建立连接,则( )字段置1A. (SYN=1,ACK=1, seq=2001 ack=2001)B. (SYN=1 ,ACK=0,seq=2000 ack=2000)C (SYN=1,CK=0, seq=2001 ack=2001)C. (SYN=0,ACK=1, seq=2000 ack=2000)A. URG B. RST C. PSH D. FIN

若seq=[1,2,3,4],则下面错误的是? A.seq[-2]为3B.seq[10]为[]C.seq[::-1]为[4,3,2,1]D.seq[:]为[1,2,3,4]

设有关系模式:student(sno,sname,age,dept),现利用命令: CREATE VIEW stu AS SELECT * FROM student WHERE dept="cs"WITH CHECK OPTION创建了一个视图。则以下SQL命令中能正确执行的是( )。A.UPDATE stu SET dept="maths"B.UPDATE stu SET dept="maths"WHERE age>=20C.INSERT INTO stu VALUES("2004001","John",30,"CS")D.INSERT INTO stu VALUES("200400l","John",50,"maths")

当需要删除某个序列seq_customer_id,可以使用如下()方式。 A.DROP SEQ_CUSTOMER_IDB.DELETE SEQUENCE SEQ_CUSTOMER_IDC.DROP SEQUENCE SEQ_CUSTOMER_IDD.DELETE SEQ_CUSTOMER_ID

主机甲向主机乙发送一个TCP报文段,SYN字段为“1”,序列号字段的值为2000, 若主机乙同意建立连接,则发送给主机甲的报文段可能为。A.(SYN=1,ACK=1, seq=2001 ack=2001)B.(SYN=1 ,ACK=0,seq=2000 ack=2000)C.(SYN=1,ACK=0, seq=2001 ack=2001)D.(SYN=0,ACK=1, seq=2000 ack=2000)

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INSERT INTO TEST VALUES(‘ID’,‘NAME’); 语句在执行时将()A、编译错:提示变量未定义B、运行错:提示不能识别符号C、将值ID和NAME插入到表中D、提示用户输入ID和NAME的值,再将输入值插入表中

如下所示,首先使用序列INVNOS插入一条记录,然后回滚这个插入操作SQLinsert into invoices values(inv_nos.nextbal,1,sysdate,150);1 row created;SQLrollback;Rollback complete在这个事务之前,序列的值为10,序列给出的下一个值是()。A、10B、11C、12D、取决于序列的创建方式

在Oracle中,有一个名为seq的序列对象,以下语句能返回序列值但不会引起序列值增加的是()A、select seq.ROWNUM from dualB、select seq.ROWID from dualC、select seq.CURRVAL from dualD、select seq.NEXTVAL from dual

Python标准库random中的sample(seq,k)方法作用是从序列中选择()(重复或不重复)的k个元素。

已知seq为长度大于10的列表,并且已导入random模块,那么[random.choice(seq)for i in range(10)]和random.sample(seq,10)等价。

Oracle中,有一个名为seq的序列对象,以下语句能返回序列值但不会引起序列值增加的是()。A、selectseq.ROWNUM from dualB、selectseq.ROWID from dualC、selectseq.CURRVAL from dualD、selectseq.NEXTVAL from dual

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',");

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’,‘’);

Examine the structure of the EMPLOYEES table: EMPLOYEE_ID NUMBER NOT NULL, Primary Key EMP_NAME VARCHAR2(30) JOB_ID NUMBER/ SAL NUMBER MGR_ID NUMBER References EMPLOYEE_ID column DEPARTMENT_ID NUMBER Foreign key to DEPARTMENT_ID column of the DEPARTMENTS table You created a sequence called EMP_ID_SEQ in orderto populate sequential values for the EMPLOYEE_ID column of the EMPLOYEES table. Which two statements regarding the EMP_ID_SEQ sequence are true? ()A、You cannot use the EMP_ID_SEQ sequence to populate the JOB_ID column.B、The EMP_ID_SEQ sequence is invalidated when you modify the EMPLOYEE_ID column.C、The EMP_ID_SEQ sequence is not affected by modifications to the EMPLOYEES table.D、Any other column of NUMBER data type in your schema can use the EMP_ID_SEQ sequence.E、The EMP_ID_SEQ sequence is dropped automatically when you drop the EMPLOYEES table.F、The EMP_ID_SEQ sequence is dropped automatically when you drop the EMPLOYEE_ID column.

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? ()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', 'smith');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','');

Examine the structure of the EMPLOYEES table: EMPLOYEE_ID NUMBER NOT NULL EMP_NAME VARCHAR2(30) JOB_ID VARCHAR2(20) SAL NUMBER MGR_ID NUMBER DEPARTMENT_ID NUMBER You want to create a SQL script file that contains an INSERT statement. When the script is run, the INSERT statement should insert a row with the specified values into the EMPLOYEES table. The INSERT statement should pass values to the table columns as specified below: EMPLOYEE_ID: Next value from the sequence EMP_ID_SEQ EMP_NAME and JOB_ID: As specified by the user during run time, throughsubstitution variables SAL: 2000 MGR_ID: No value DEPARTMENT_ID: Supplied by the user during run time through substitution variable. The INSERT statement should fail if the user supplies a value other than 20 or 50. Which INSERT statement meets the above requirements?()A、INSERT INTO employees VALUES (emp_id_seq.NEXTVAL, 'ename', 'jobid', 2000, NULL, did);B、INSERT INTO employees VALUES (emp_id_seq.NEXTVAL, 'ename', 'jobid', 2000, NULL, did IN (20,50));C、INSERT INTO (SELECT * FROM employees WHERE department_id IN (20,50)) VALUES (emp_id_seq.NEXTVAL, 'ename', 'jobid', 2000, NULL, did);D、INSERT INTO (SELECT * FROM employees WHERE department_id IN (20,50) WITH CHECK OPTION) VALUES (emp_id_seq.NEXTVAL, 'ename', 'jobid', 2000, NULL, did);E、INSERT INTO (SELECT * FROM employees WHERE (department_id = 20 AND department_id = 50) WITH CHECK OPTION ) VALUES (emp_id_seq.NEXTVAL, 'ename', 'jobid', 2000, NULL, did);

当需要删除某个序列seq_customer_id,可以使用如下()方式。A、DROP SEQ_CUSTOMER_IDB、DELETE SEQUENCE SEQ_CUSTOMER_IDC、DROP SEQUENCE SEQ_CUSTOMER_IDD、DELETE SEQ_CUSTOMER_ID

Examine the structure of the EMPLOYEES table: EMPLOYEE_ID NUMBER NOT NULL EMP_NAME VARCHAR2(30) JOB_ID VARCHAR2(20) SAL NUMBER MGR_ID NUMBER DEPARTMENT_ID NUMBER You want to create a SQL script file that contains an INSERT statement. When the script is run, the INSERT statement should insert a row with the specified values into the EMPLOYEES table. The INSERT statement should pass values to the table columns as specified below: EMPLOYEE_ID: Next value from the sequence EMP_ID_SEQEMP_NAME and JOB_ID: As specified by the user during run time, through substitution variables SAL: 2000 MGR_ID: No value DEPARTMENT_ID: Supplied by the user during run time through substitution variable. The INSERT statement should fail if the user supplies a value other than 20 or 50. Which INSERT statement meets the above requirements?()A、INSERT INTO employees VALUES (emp_id_seq.NEXTVAL, ename','jobid', 2000, NULL, did);B、INSERT INTO employees VALUES (emp_id_seq.NEXTVAL, 'ename', 'jobid', 2000, NULL, did IN (20,50));C、INSERT INTO (SELECT * FROM employees WHERE department_id IN (20,50)) VALUES (emp_id_seq.NEXTVAL, ename','jobid', 2000, NULL, did);D、INSERT INTO (SELECT * FROM employees WHERE department_id IN (20,50) WITH CHECK OPTION) VALUES (emp_id_seq.NEXTVAL, ename','jobid', 2000, NULL, did);E、INSERT INTO (SELECT * FROM employees WHERE (department_id = 20 AND department_id = 50) WITH CHECK OPTION ) VALUES (emp_id_seq.NEXTVAL, ename','jobid', 2000, NULL, did);

单选题Examine the structure of the EMPLOYEES table: EMPLOYEE_ID NUMBER NOT NULL EMP_NAME VARCHAR2(30) JOB_ID VARCHAR2(20) SAL NUMBER MGR_ID NUMBER DEPARTMENT_ID NUMBER You want to create a SQL script file that contains an INSERT statement. When the script is run, the INSERT statement should insert a row with the specified values into the EMPLOYEES table. The INSERT statement should pass values to the table columns as specified below: EMPLOYEE_ID: Next value from the sequence EMP_ID_SEQEMP_NAME and JOB_ID: As specified by the user during run time, through substitution variables SAL: 2000 MGR_ID: No value DEPARTMENT_ID: Supplied by the user during run time through substitution variable. The INSERT statement should fail if the user supplies a value other than 20 or 50. Which INSERT statement meets the above requirements?()AINSERT INTO employees VALUES (emp_id_seq.NEXTVAL, ename','jobid', 2000, NULL, did);BINSERT INTO employees VALUES (emp_id_seq.NEXTVAL, 'ename', 'jobid', 2000, NULL, did IN (20,50));CINSERT INTO (SELECT * FROM employees WHERE department_id IN (20,50)) VALUES (emp_id_seq.NEXTVAL, ename','jobid', 2000, NULL, did);DINSERT INTO (SELECT * FROM employees WHERE department_id IN (20,50) WITH CHECK OPTION) VALUES (emp_id_seq.NEXTVAL, ename','jobid', 2000, NULL, did);EINSERT INTO (SELECT * FROM employees WHERE (department_id = 20 AND department_id = 50) WITH CHECK OPTION ) VALUES (emp_id_seq.NEXTVAL, ename','jobid', 2000, NULL, did);

单选题Examine the structure of the EMPLOYEES table: EMPLOYEE_ID NUMBER NOT NULL EMP_NAME VARCHAR2(30) JOB_ID VARCHAR2(20) SAL NUMBER MGR_ID NUMBER DEPARTMENT_ID NUMBER You want to create a SQL script file that contains an INSERT statement. When the script is run, the INSERT statement should insert a row with the specified values into the EMPLOYEES table. The INSERT statement should pass values to the table columns as specified below: EMPLOYEE_ID: Next value from the sequence EMP_ID_SEQ EMP_NAME and JOB_ID: As specified by the user during run time, throughsubstitution variables SAL: 2000 MGR_ID: No value DEPARTMENT_ID: Supplied by the user during run time through substitution variable. The INSERT statement should fail if the user supplies a value other than 20 or 50. Which INSERT statement meets the above requirements?()AINSERT INTO employees VALUES (emp_id_seq.NEXTVAL, 'ename', 'jobid', 2000, NULL, did);BINSERT INTO employees VALUES (emp_id_seq.NEXTVAL, 'ename', 'jobid', 2000, NULL, did IN (20,50));CINSERT INTO (SELECT * FROM employees WHERE department_id IN (20,50)) VALUES (emp_id_seq.NEXTVAL, 'ename', 'jobid', 2000, NULL, did);DINSERT INTO (SELECT * FROM employees WHERE department_id IN (20,50) WITH CHECK OPTION) VALUES (emp_id_seq.NEXTVAL, 'ename', 'jobid', 2000, NULL, did);EINSERT INTO (SELECT * FROM employees WHERE (department_id = 20 AND department_id = 50) WITH CHECK OPTION ) VALUES (emp_id_seq.NEXTVAL, 'ename', 'jobid', 2000, NULL, did);