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2207/MySQL数据库操作综合练习题答案.md

@@ -47,3 +47,40 @@ ALTER TABLE orders DROP FOREIGN KEY orders_ibfk_1;
 DROP TABLE orders;
 ```
 
+---
+
+### 练习二
+
+```sql
+#(1)创建表、插入记录
+CREATE TABLE pet(
+	`name` VARCHAR(20) NOT NULL COMMENT '宠物名称',
+	`owner` VARCHAR(20) COMMENT '宠物主人',
+	species VARCHAR(20) NOT NULL COMMENT '种类',
+	sex CHAR(1) NOT NULL COMMENT '性别',
+	birth YEAR NOT NULL COMMENT '出生日期',
+	death YEAR COMMENT '死亡日期'
+);
+INSERT INTO pet()
+VALUES
+('Fluffy', 'Harold', 'cat', 'f', 2003, 2010),
+('Claws', 'Gwen', 'cat', 'm', 2004,NULL ),
+('Buffy', NULL, 'dog', 'f', 2009, NULL),
+('Fang', 'Benny', 'dog', 'm', 2000, NULL),
+('Bowser', 'Diane', 'dog', 'm', 2003, 2009),
+('Chirpy', NULL, 'bird', 'f', 2008, NULL);
+#(2)更新记录
+UPDATE pet
+SET `owner` = 'Kevin'
+WHERE `name` = 'Fang';
+#(3)
+UPDATE pet
+SET `owner` = 'Kevin'
+WHERE `owner` IS NULL;
+#(4)
+DELETE FROM pet
+WHERE death IS NOT NULL;
+#(5)
+TRUNCATE pet;
+```
+