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| --------------
SET AUTOCOMMIT = 0
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--------------
START TRANSACTION
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--------------
DROP DATABASE IF EXISTS `base`
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--------------
CREATE DATABASE `base`
DEFAULT CHARACTER SET `latin1`
DEFAULT COLLATE `latin1_general_ci`
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DROP TABLE IF EXISTS `ip_client`
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CREATE TABLE `ip_client`
( `client_id` integer unsigned not null primary key
) ENGINE=InnoDB
DEFAULT CHARSET=`latin1` COLLATE=`latin1_general_ci`
ROW_FORMAT=COMPRESSED
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insert into `ip_client` (`client_id`) values (10), (20), (30)
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select * from ip_client
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+-----------+
| client_id |
+-----------+
| 10 |
| 20 |
| 30 |
+-----------+
--------------
DROP TABLE IF EXISTS `ip_client_olds`
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CREATE TABLE `ip_client_olds`
( `id` integer unsigned not null AUTO_INCREMENT primary key,
`client_id` integer unsigned not null,
`old_ttc` decimal(15,2) null
) ENGINE=InnoDB
DEFAULT CHARSET=`latin1` COLLATE=`latin1_general_ci`
ROW_FORMAT=COMPRESSED
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insert into `ip_client_olds` (`client_id`,`old_ttc`) values
(10, NULL), (20, 15.10), (10, 12.50), (20, 27.30)
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select * from ip_client_olds
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+----+-----------+---------+
| id | client_id | old_ttc |
+----+-----------+---------+
| 1 | 10 | NULL |
| 2 | 20 | 15.10 |
| 3 | 10 | 12.50 |
| 4 | 20 | 27.30 |
+----+-----------+---------+
--------------
select client_id,
sum(old_ttc) as total
from ip_client_olds
group by client_id
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+-----------+-------+
| client_id | total |
+-----------+-------+
| 10 | 12.50 |
| 20 | 42.40 |
+-----------+-------+
--------------
select t1.client_id,
sum(t2.old_ttc) as total
from ip_client as t1
left outer join ip_client_olds as t2
on t2.client_id = t1.client_id
group by t1.client_id
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+-----------+-------+
| client_id | total |
+-----------+-------+
| 10 | 12.50 |
| 20 | 42.40 |
| 30 | NULL |
+-----------+-------+
--------------
select t1.client_id,
sum(coalesce(t2.old_ttc, 0)) as total
from ip_client as t1
left outer join ip_client_olds as t2
on t2.client_id = t1.client_id
group by t1.client_id
--------------
+-----------+-------+
| client_id | total |
+-----------+-------+
| 10 | 12.50 |
| 20 | 42.40 |
| 30 | 0.00 |
+-----------+-------+
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COMMIT
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SET AUTOCOMMIT = 1
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