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+# CASE
+
+```sql
+### 2. :根据薪资范围增加奖金，使用 `CASE` 语句和循环
+
+设计一个存储过程，遍历所有员工，根据薪资范围增加奖金：
+
+- 薪资 < 10000: 奖金增加 100
+- 薪资在 10000 到 20000 之间: 奖金增加 200
+- 薪资 > 30000  不加
+
+最后打印几个员工增加了奖金a
+DROP PROCEDURE IF EXISTS addcomm;
+
+CREATE PROCEDURE addcomm()
+BEGIN
+SELECT count(u.增加了奖金) 几个员工增加了奖金 FROM (SELECT ename,sal,case WHEN sal<10000 THEN sal+100 WHEN sal BETWEEN 10000 AND 20000 THEN sal+200 WHEN sal>30000 THEN sal  END AS 增加了奖金 FROM emp) u ;
+END;
+CALL addcomm;
+
+
+3. 分组统计全公司各部门的平均工资，人数，及10000以下、10001-20000、20001-30000、30001以上的人数
+SELECT AVG(sal),CASE 
+	WHEN sal<10000 THEN '1'
+	WHEN sal BETWEEN 10001 AND 20000 THEN '2'
+	WHEN sal BETWEEN 20001 AND 30000 THEN '3'
+	WHEN sal>30001 THEN '4'
+  END AS commm
+  FROM emp GROUP BY commm
+  -----------------------------------------------
+DROP PROCEDURE IF EXISTS addcomm;
+
+CREATE PROCEDURE addcomm()
+BEGIN
+  SELECT CASE WHEN ur.commm = '1' THEN '10000'
+   WHEN ur.commm = '2' THEN '10001-20000'
+   WHEN ur.commm = '3' THEN '20001-30000'
+   WHEN ur.commm = '4' THEN '30001以上'
+END AS A分类 ,
+AVG(ur.sal) B平均工资,COUNT(ur.commm) AS C人数
+FROM (SELECT *,CASE 
+	WHEN sal<10000 THEN '1'
+	WHEN sal BETWEEN 10001 AND 20000 THEN '2'
+	WHEN sal BETWEEN 20001 AND 30000 THEN '3'
+	WHEN sal>30001 THEN '4'
+  END AS commm
+  FROM emp em) ur GROUP BY ur.commm;
+END;
+
+CALL addcomm;
+```
+