SELECT column_name(s) FROM table1 UNION ALL SELECT column_name(s) FROM table2; -> 두가지가 합쳐져서 행으로... 없음에는 null 허용 안함 한글 나오려면 DEFAULT CHARACTER SET UTF8 를 붙여준다. person id가 0(null)...
△배우 자주 사용되니 사용법 기억해둬야 IS NULL 연산자 NULL 아닌 값 출력 집합 연산자 UNION, UNION ALL, MINUS, INTTERSECT 각 SELECT문이 출력하려는 열 개수와 각 열의 자료형이 순서별로 일치해야...
--6번 select * from emp where comm is null and MGR is not null and job = 'MANAGER' and ename not like '_L%' union all select * from emp where comm is null and MGR is not null and job = 'CLERK...
dual UNION ALL SELECT 2 AS item_id, 'SQL' AS item_desc FROM dual ) SELECT item_id , item_desc , NULLIF(item_desc, 'ORACLE') AS new_item_desc FROM mydb item_desc 칼럼의 값이 'ORACLE'인 경우 NULL을 반환하고...
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SELECT empno, ename, sal FROM emp WHERE job = 'SALESMAN' UNION ALL SELECT null, null, sum(sal) FROM emp WHERE job = 'SALESMAN';
(SALES_DATE, 'YYYYMM') = '202203' UNION ALL SELECT SALES_DATE , PRODUCT_ID , NULL AS USER_ID , SALES_AMOUNT FROM OFFLINE_SALE WHERE TO_CHAR(SALES_DATE, 'YYYYMM') = '202203' ) ORDER BY SALES_DATE, PRODUCT_ID, USER...
... UNION ALL 집합연산 사용 시 동일 컬럼 갯수, 컬럼 타입을 넣어줘야 되는것과 같은 이치.. 구지... SELECT search_condition, CASE WHEN search_condition IS NULL THEN ' ' END FROM user_constraints; 단 NULL로 표기가 안되지만...
... ㅠㅠ 예를 들어 rpt_name asst serial_no 1 RPT_ITM_MAT NULL DD2100941 이 결과값을 rpt_name asst serial_no 1... 됩니다 select * from ~~~~~ union all select * from ~~~~~ union all select * from ~~~~~ union all select * from ~~~~~
... 7를 사용하여 WITH recursive cte AS ( SELECT cateName, cateCode, cateCodeRef, 1 AS level FROM goods_category WHERE cateCodeRef IS null UNION all SELECT p.cateName, p.cateCode, p.cateCodeRef, 1 + LEVEL AS level FROM goods...
... 현재는 Select b.name, a.id From student a, profile b Where a.id = b.id And b.grade = ‘1’ Union all Select count(*) From... count를 to_char 처리하고 필드하나를 null 값으로 반환하는 후행쿼리를 작성해야겠죠..
... SELECT C.USER_KEY , U.USER_NM FROM BOARD C INNER JOIN USER U ON U.USER_KEY = C.USER_KEY UNION ALL SELECT USER_KEY , '' AS USER_NM FROM BOARD WHERE USER_KEY IS NULL; SELECT C.USER_KEY , U.USER_NM FROM BOARD C LEFT OUTER JOIN USER U ON C....
... SELECT COUNT(*) AS col1, NULL AS col2, 'a' AS col3, '' AS col4 FROM dual UNION ALL SELECT NULL AS col1, COUNT(*) AS col2, '' AS col3, 'b' AS col4 FROM dual 이것을... SELECT MAX(col1), MAX(col2), MAX(col3), MAX(col4)...