导读:1建站知识这篇文章主要通过实例简要介绍case函数的用法，学习oracle的朋友可以参考下营销型网站建设百度seo网站优化。

1.创建测试表:

复制代码 代码如下:

DROP SEQUENCE student_sequence;CREATE SEQUENCE student_sequence  START WITH 10000  INCREMENT BY 1;

DROP TAB网站seo优化软件LE students;CREATE TABLE students (  id               NUMBER(5) PRIMARY KEY,  first_name       VARCHAR2(20),  last_name        VARCHAR2(20),  major            VARCHAR2(30),  current_credits  NUMBER(3),  grade     varchar2(2));

INSERT INTO students (id, first_name, last_name, major, current_credits,grade)  VALUES (student_sequence.NEXTVAL, 'Scott', 'Smith', 'Computer Science', 98,null);

INSERT INTO students (id, first_name, last_name, major, current_credits,grade)  VALUES (student_sequence.NEXTVAL, 'Margaret', 'Mason', 'History', 88,null);

INSERT INTO students (id, first_name, last_name, major, current_credits,grade)  VALUES (student_sequence.NEXTVAL, 'Joanne', 'Junebug', 'Computer Science', 75,null);

INSERT INTO students (id, first_name, last_name, major, current_credits,grade)  VALUES (student_sequence.NEXTVAL, 'Manish', 'Murgratroid', 'Economics', 66,null);

commit;

2.查看相应数据

复制代码 代码如下:

SQL> select * from students;

        ID FIRST_NAME      &nseo网站优化bsp;    LAST_NAME            MAJOR                          CURRENT_CREDITS GR---------- -------------------- -------------------- ------------------------------ --------------- --     10000 Scott                Smith                Computer Science                            98     10001 Margaret             Mason                History                                     88     10002 Joanne               Junebug              Computer Science                            75     10003 Manish               Murgratroid          Economics                                   66

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