Add more to emp-dept exercise.

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

@@ -53,4 +53,39 @@ SELECT ename, sal FROM emp
 	ORDER BY ename ASC, sal DESC;
 
 -- 16
-SELECT MAX(sal) FROM emp GROUP BY deptno HAVING deptno IN (10, 20);
+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 COUNT(*) FROM emp WHERE deptno=20) "employees deptno 20",
+	(SELECT AVG(sal) FROM emp WHERE deptno=30) "avg sal deptno 30" FROM dual;
+
+-- 18
+SELECT ename "NOMBRE", sal+NVL(comm, 0) "SALARIO_TOTAL"
+	FROM emp
+	WHERE deptno=20 ORDER BY ename;
+
+-- 19
+SELECT ename "NOMBRE", sal+NVL(comm, 0) "SALARIO_TOTAL" FROM emp
+	WHERE deptno=10 AND sal > 2000
+	UNION
+	SELECT ename, sal+NVL(comm, 0) FROM emp
+	WHERE sal > 1200
+	ORDER BY SALARIO_TOTAL DESC;
+
+-- 20
+SELECT deptno, ename FROM emp
+	WHERE deptno IN (SELECT deptno FROM emp WHERE ename IN ('JAMES', 'SCOTT')) AND
+	ename NOT IN ('JAMES', 'SCOTT')
+	ORDER BY deptno, ename;
+
+-- 21
+SELECT dname FROM emp JOIN dept ON emp.deptno=dept.deptno GROUP BY dept.dname HAVING COUNT(*) > 4;
+
+-- 23
+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;