ORACLE 학습 노트-조회 편

일반 검색

/*     */
select * from STU

/*   3   */
select * from stu where ROWNUM<=3 

/*    */
select * from stu where stu_id like 'stu001%'

설명:마스크"%"는 하나 이상 의 문자,마스크""을 의미 합 니 다.문자 하 나 를 대표 합 니 다.

/*  */
select STU_ID as    from stu

2.공동 조회

/*      */
SELECT STU.STU_NAME, STU.STU_AGE, KC.KC_NAME FROM STU, KC WHERE STU.KC_NO = KC.KC_NO

/*    */
SELECT STU.STU_NAME, STU.STU_AGE, KC.KC_NAME FROM STU INNER JOIN KC ON STU.KC_NO = KC.KC_NO ORDER BY STU.STU_ID 

/*   */
SELECT STU.STU_NAME, STU.STU_AGE, KC.KC_NAME FROM STU LEFT JOIN KC ON STU.KC_NO = KC.KC_NO ORDER BY STU.STU_ID 

/*   */
SELECT STU.STU_NAME, STU.STU_AGE, KC.KC_NAME FROM STU RIGHT JOIN KC ON STU.KC_NO = KC.KC_NO ORDER BY STU.STU_ID 

/*   */
SELECT STU.STU_NAME, STU.STU_AGE, KC.KC_NAME FROM STU FULL JOIN KC ON STU.KC_NO = KC.KC_NO ORDER BY STU.STU_ID 

/*UNION   ，         */
SELECT STU_NAME FROM STU UNION SELECT KC_NAME FROM KC