Oracle case函数使用介绍

前端技术 2023/09/03 Oracle

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 TABLE 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;

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