From 29181c6f0ae5dca8949e2ce04916c4dbcaad5ac7 Mon Sep 17 00:00:00 2001 From: syneffort Date: Thu, 22 Sep 2022 18:10:34 +0900 Subject: [PATCH] =?UTF-8?q?=EC=A7=91=ED=95=A9=EC=97=B0=EC=82=B0=EC=9E=90,?= =?UTF-8?q?=20=EC=A7=91=EB=8B=A8=EC=97=B0=EC=82=B0=EC=9E=90?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- set operator.sql | 51 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 51 insertions(+) create mode 100644 set operator.sql diff --git a/set operator.sql b/set operator.sql new file mode 100644 index 0000000..2ef902d --- /dev/null +++ b/set operator.sql @@ -0,0 +1,51 @@ +USE Study +GO + +(SELECT * FROM EMPLOYEE WHERE DNO = 10) +UNION +(SELECT * FROM EMPLOYEE WHERE JOB = 'chief') + +(SELECT * FROM EMPLOYEE WHERE DNO = 10) +INTERSECT +(SELECT * FROM EMPLOYEE WHERE JOB = 'chief') + +(SELECT * FROM EMPLOYEE WHERE DNO = 10) +EXCEPT +(SELECT * FROM EMPLOYEE WHERE JOB = 'chief') + +-- 중복 허용 합집합 +(SELECT * FROM EMPLOYEE WHERE DNO = 10) +UNION ALL +(SELECT * FROM EMPLOYEE WHERE JOB = 'chief') + +-- 외부 합집합 (합병 호환성[: 속성 개수 및 타입 일치] 불일치 할 때) +(SELECT ENO, ENAME, DNO, NULL FROM EMPLOYEE) +UNION +(SELECT NULL, NULL, DNO, DNAME FROM DEPARTMENT) + +-- 집단 연산자 +SELECT AVG(SALARY) FROM EMPLOYEE + +SELECT MAX(SALARY) AS MAXSALARY, MIN(SALARY) AS MINSALARY FROM EMPLOYEE + +SELECT AVG(SALARY) AS AVERAGE, VAR(SALARY) AS VARIANCE, STDEV(SALARY) AS STANDARDDEVIATION FROM EMPLOYEE + +SELECT * FROM EMPLOYEE +SELECT COUNT(*) AS NUMROW, COUNT(COMMISSION) FROM EMPLOYEE + +SELECT * FROM EMPLOYEE +SELECT COUNT(JOB) AS JOB, COUNT(DISTINCT JOB) AS DISTJOB FROM EMPLOYEE + +SELECT DNO, AVG(SALARY) AS AVGSAL FROM EMPLOYEE GROUP BY DNO + +SELECT DNO, AVG(SALARY) AS AVGSAL FROM EMPLOYEE GROUP BY DNO HAVING MAX(SALARY) > 500 + +SELECT DNO, JOB, AVG(SALARY) AS AVGSAL FROM EMPLOYEE GROUP BY DNO, JOB ORDER BY DNO + +SELECT DNO, JOB, AVG(SALARY) AS AVGSAL FROM EMPLOYEE GROUP BY DNO, JOB WITH ROLLUP + +SELECT DNO, JOB, AVG(SALARY) AS AVGSAL FROM EMPLOYEE GROUP BY DNO, JOB WITH CUBE + +SELECT DNO, JOB, AVG(SALARY) AS AVGSAL FROM EMPLOYEE GROUP BY GROUPING SETS (DNO, JOB) -- DNO, JOB 따로 한 것을 UNION 해서 보여줌 + +