使用多个表的优化方法查询结果

Question

我正在尝试使用4个表来获取数据。表列表

• 数字
• 呼叫
• ref_label_no
• 标签

我想获取带有特定标签的电话号码的数据。这是桌子。

数字表：

select id,uuid,number from numbers limit 1;
+----+--------------------------------------+------------+
| id | uuid                                 | number     |
+----+--------------------------------------+------------+
|  1 | ed268b05-758e-44fd-b429-8d5223651814 | 1234561222 |
+----+--------------------------------------+------------+

调用表

mysql> select id,uuid,did from calls limit 2;
+----+-------------------------------------+------------+
| id | uuid                                | number     |
+----+-------------------------------------+------------+
|  1 | ddddass-b810-4f23-7456-8ff56efab080 | 1234561222 |
|  2 | dddddd-b810-4f23-7456-8ff56efab080  | 123456789  |
+----+-------------------------------------+------------+
2 rows in set (0.02 sec)

ref_label_no表

mysql> select uuid,number_uuid,label_uuid from ref_label_no limit 1;
+--------------------------------------+--------------------------------------+--------------------------------------+
| uuid                                 | number_uuid                          | label_uuid                           |
+--------------------------------------+--------------------------------------+--------------------------------------+
| 7a5e1b6e-0194-4993-8d78-5f7a1b60c7d2 | ed268b05-758e-44fd-b429-8d5223651814 | 7262b06e-9263-4825-8411-4c107104a60b |
+--------------------------------------+--------------------------------------+--------------------------------------+
1 row in set (0.00 sec)

标签表

mysql> select uuid,name from labels limit 1;
+--------------------------------------+-------+
| uuid                                 | name  |
+--------------------------------------+-------+
| 7262b06e-9263-4825-8411-4c107104a60b | INDIA |
+--------------------------------------+-------+
1 row in set (0.00 sec)

现在我想要结果，就像我所需要的总calls.This输出的调用号一样

mysql> select uuid,name from labels limit 1;
+--------------------------------------+-------+
| Number                       | Total_calls  |
+--------------------------------------+-------+
| 13456789                     |       2      |
+--------------------------------------+-------+
1 row in set (0.00 sec)

我已经做了以下的查询，但没有成功，也需要太多的时间来回应。

select count(*) as Total_calls,calls.number as did,labels.name,calls.created_at as callstart from calls, labels JOIN ref_label_no ON labels.uuid = ref_label_no.label_uuid JOIN numbers ON numbers.uuid = ref_label_no.number_uuid where labels.name="INDIA"  group by calls.number;

有什么建议或建议吗？

Answer 1

多个表避免使用联接，请使用Union。它会比加入快。

像这样，

select uuid,did from calls union 
select uuid,number_uuid as did from ref_label_no union
select uuid,name as did from labels

Answer 2

SELECT COUNT(calls.uuid) as total_calls, numbers.number
FROM numbers JOIN calls ON numbers.number = calls.number
JOIN ref_label_no ON ref_label_no.number_uuid = numbers.uuid
JOIN labels ON labels.uuid = ref_label_no.label_uuid
WHERE labels.name="INDIA"
GROUP BY numbers.number;

由于我们正在计算按数字分组的调用总数，所以您无法在查询结果中选择calls.created_at，因为它与聚合函数计数相冲突。

以下查询使用存在条件：

SELECT COUNT(calls.uuid) as total_calls, numbers.number
FROM calls JOIN numbers ON numbers.number = calls.number
WHERE EXISTS(SELECT 1 FROM ref_label_no JOIN labels ON labels.uuid = ref_label_no.label_uuid
WHERE labels.name="INDIA" AND numbers.uuid = ref_label_no.number_uuid)
GROUP BY numbers.number;