get data and count from table with join from two different tables - mysql

Question

I have three tables activity_log, user, staff. I have to select data from activity_log to identify which user has done which activity.
This is structure of activity_log table
CREATE TABLE `activity_log` (
`id` int(11) NOT NULL,
`user_id` int(11) NOT NULL,
`os` varchar(20) NOT NULL,
`api` varchar(100) NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=latin1;
Dumping data for table activity_log
INSERT INTO `activity_log` (`id`, `user_id`, `os`, `api`) VALUES
(1, 1, 'web', 'user/login'),
(2, 2, 'web', 'user/report'),
(3, 1, 'android', 'user/login'),
(4, 2, 'ios', 'user/data'),
(5, 3, 'android', 'user/category'),
(6, 3, 'web', 'user/result'),
(7, 3, 'ios', 'user/send_sms');
This is structure of user table
CREATE TABLE `user` (
`id` int(11) NOT NULL,
`first_name` varchar(100) NOT NULL,
`last_name` varchar(100) NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=latin1;
Dumping data for table user
INSERT INTO `user` (`id`, `first_name`, `last_name`) VALUES
(1, 'Yogesh', 'Kale'),
(2, 'Sunit', 'Desai'),
(3, 'Paresh', 'Godambe');
This is my staff table
CREATE TABLE `staff` (
`id` int(11) NOT NULL,
`first_name` varchar(100) NOT NULL,
`last_name` varchar(100) NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=latin1;
Dumping data for table staff
INSERT INTO `staff` (`id`, `first_name`, `last_name`) VALUES
(1, 'abcd', 'asas'),
(2, 'ajay', 'shinde'),
(3, 'kapil', 'parab');
But I have to join activity log on one condition. That condition is based on os column in activity_log table. That condition is if os column contain value as web then I have to join user_id of activity_log with id column of staff table and if os column contain value as ios or android then I have to join user_id of activity_log with id column of user table.
I need two different queries one for getting data with columns id and api from activity_log, first_name, last_name from either staff or user and another for getting total count for same above condition. I have given my table schema for reference.
I have tried following query for getting data
SELECT
al.id as id,
CONCAT(u.first_name, ' ', u.last_name) as user_name,
al.api
FROM
activity_log al
JOIN
user u
ON
u.id = al.user_id
WHERE
al.os IN('android','os')
UNION ALL
SELECT
al.id as id,
CONCAT(st.first_name, ' ', st.last_name) as user_name,
al.api
FROM
activity_log al
JOIN
staff st
ON
st.id = al.user_id
WHERE
al.os = 'web'
This above query returns me right data. But I dont know how to get count with above condition. Thats where I stuck in this. If possible please give me alternate queries for getting data and count.
Please help me in this. I spent whole day to figure out this. Thanks in advance

Answer 1

You can try using UNION ALL to get the required data.
Query 1:
select al.id, al.api,s.first_name, s.last_name from activity_log al inner join staff s on al.user_id=s.id where al.os='web'
UNION ALL
select al.id, al.api,u.first_name, u.last_name from activity_log al inner join user u on al.user_id=u.id where al.os!='web'
Query 2:
select
(select count(*) from activity_log al, staff s where al.user_id=s.id and al.os='web') as webcount,
(select count(*) from activity_log al, user u where al.user_id=u.id and al.os!='web') as othercount
I hope this gives you a direction for your question.

Answer 2

Try with
SELECT ...,count(*) FROM table1
INNER JOIN table2 ON ... WHERE ...