Finished exercises emp_dept

1/GBD/assignments/ej-emp-dept.sql

@@ -57,7 +57,7 @@ SELECT (SELECT MAX(sal) FROM emp WHERE deptno=10) "deptno 10",
 	(SELECT MAX(sal) FROM emp WHERE deptno=20) "deptno 20" FROM dual;
 
 -- 17
-SELECT (SELECT MIN(sal) FROM emp WHERE deptno=10) "min sal depnto 10",
+SELECT (SELECT MIN(sal) FROM emp WHERE deptno=10) "min sal deptno 10",
 	(SELECT COUNT(*) FROM emp WHERE deptno=20) "employees deptno 20",
 	(SELECT AVG(sal) FROM emp WHERE deptno=30) "avg sal deptno 30" FROM dual;
 
@@ -88,4 +88,48 @@ SELECT deptno, ROUND(AVG(sal), 2) FROM emp
 	WHERE deptno IN (SELECT DISTINCT deptno FROM emp WHERE job='SALESMAN') GROUP BY deptno;
 
 -- 24
-SELECT deptno, COUNT(*) "NUM" FROM emp GROUP BY deptno ORDER BY NUM DESC LIMIT 1;
+SELECT deptno FROM emp
+	GROUP BY deptno HAVING COUNT(*) =
+	(SELECT MAX(COUNT(*)) FROM emp
+	GROUP BY deptno);
+
+-- 25
+SELECT dname FROM dept
+	WHERE deptno=(
+	SELECT deptno FROM emp
+	GROUP BY deptno HAVING COUNT(*) =
+	(SELECT MAX(COUNT(*)) FROM emp
+	GROUP BY deptno));
+
+-- 26
+SELECT ename, sal FROM emp
+	WHERE deptno=(
+	SELECT deptno FROM emp
+	GROUP BY deptno HAVING COUNT(*) =
+	(SELECT MAX(COUNT(*)) FROM emp
+	GROUP BY deptno)) ORDER BY ename;
+
+-- 27
+SELECT ROUND(AVG(sal), 2) FROM emp
+	GROUP BY deptno HAVING deptno !=
+	(SELECT deptno FROM emp WHERE ename='SCOTT');
+
+-- 28
+SELECT ename FROM emp
+	WHERE mgr IN (
+	SELECT empno FROM emp
+	WHERE sal > (SELECT sal FROM emp WHERE hiredate='1981-04-02'));
+
+-- 29
+SELECT job, ename, sal FROM emp
+	WHERE sal > (
+	SELECT AVG(sal) FROM emp WHERE deptno=(
+	SELECT deptno FROM emp WHERE ename='MILLER'));
+
+-- 30
+SELECT ename, hiredate FROM emp
+	WHERE hiredate BETWEEN
+	(SELECT hiredate FROM emp WHERE ename='JONES')
+	AND
+	(SELECT hiredate FROM emp WHERE ename='SCOTT')
+	ORDER BY ename;