修正查询计数的答案错误

data/2.MySQL中阶/4.聚合和分组/1. 计数/config.json

 {
   "node_id": "mysql-ac3c072bc54749bdb82324f2b203890d",
-  "keywords": ["count", "计数"],
+  "keywords": [
+    "count",
+    "计数"
+  ],
   "children": [],
   "export": [
     "count.json"

data/2.MySQL中阶/4.聚合和分组/1. 计数/count.md

@@ -33,7 +33,12 @@ from items;
 ## 答案
 
 ```
-3, 4
++----------+-------------+
+| count(*) | count(item) |
++----------+-------------+
+|        4 |           3 |
++----------+-------------+
+1 row in set (0.00 sec)
 ```
 
 ## 选项
@@ -41,29 +46,54 @@ from items;
 ### A
 
 ```
-4, NULL
++----------+-------------+
+| count(*) | count(item) |
++----------+-------------+
+|        4 |        NULL |
++----------+-------------+
+1 row in set (0.00 sec)
 ```
 
 ### B
 
 ```
-3, 3
++----------+-------------+
+| count(*) | count(item) |
++----------+-------------+
+|        3 |           3 |
++----------+-------------+
+1 row in set (0.00 sec)
 ```
 
 ### C
 
 ```
-1, 0
++----------+-------------+
+| count(*) | count(item) |
++----------+-------------+
+|        4 |           4 |
++----------+-------------+
+1 row in set (0.00 sec)
 ```
 
 ### D
 
 ```
-NULL,  NULL
++----------+-------------+
+| count(*) | count(item) |
++----------+-------------+
+|     NULL |        NULL |
++----------+-------------+
+1 row in set (0.00 sec)
 ```
 
 ### E
 
 ```
-4, 4
++----------+-------------+
+| count(*) | count(item) |
++----------+-------------+
+|        4 |           0 |
++----------+-------------+
+1 row in set (0.00 sec)
 ```
\ No newline at end of file