導讀:1建站知識這篇文章主要通過實例簡要介紹case函數的用法，學習oracle的朋友可以參考下營銷型網站建設百度seo網站優化。

1.創建測試表:

復制代碼 代碼如下:

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

DROP TAB網站seo優化軟件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.查看相應數據

復制代碼 代碼如下:

SQL> select * from students;

        ID FIRST_NAME      &nseo網站優化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

關鍵詞標簽: 標簽 函數