Update ch03: 复杂一点的查询.md

ch03: 复杂一点的查询.md

@@ -794,8 +794,8 @@ COALESCE(NULL, NULL, '2020-11-01') AS col_3;
 -- DDL ：创建表
 CREATE TABLE samplelike
 ( strcol VARCHAR(6) NOT NULL,
-PRIMARY KEY (strcol)
-samplelike);
+  PRIMARY KEY (strcol)
+);
 -- DML ：插入数据
 START TRANSACTION; -- 开始事务
 INSERT INTO samplelike (strcol) VALUES ('abcddd');