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2208/天天乐学考试答案/MySQL练习（一）.md

@@ -194,3 +194,34 @@ SELECT @result;
 
 ### 第三套
 
+```sql
+#1
+CREATE TABLE tb_order(
+	oid INT PRIMARY KEY AUTO_INCREMENT COMMENT '订单ID',
+	odate DATETIME NOT NULL COMMENT '下单日期',
+	quantity INT NOT NULL DEFAULT 1 COMMENT '下单数量'
+);
+
+#2
+ALTER TABLE tb_books MODIFY price DECIMAL(10, 2);
+
+#3
+ALTER TABLE tb_book_authors ADD CONSTRAINT tB_ibfk_1 FOREIGN KEY(book_id) REFERENCES tb_books(book_id);
+
+ALTER TABLE tb_book_authors ADD CONSTRAINT tB_ibfk_2 FOREIGN KEY(author_id) REFERENCES tb_authors(author_id);
+
+#4
+ALTER TABLE tb_authors ADD avatar MEDIUMBLOB;
+
+#5
+#使用查询和LOAD_FILE函数 导入指定路径的图片
+SELECT LOAD_FILE('C:/TTLXExam/20501071168/MYSQLDB/3/jinyong.jpg');
+
+UPDATE tb_authors a
+SET a.avatar = LOAD_FILE('C:/TTLXExam/20501071168/MYSQLDB/3/jinyong.jpg')
+WHERE a.author_name = '金庸';
+
+#6
+
+```
+