Increment MySQL uniq row by only one request - mysql

Question

I need to increment value unique row, use only one request
Not use select and after condition INSERT OR UPDATE
Table columns (date, servie) are used as unique values
Only one INSERT
For example
CREATE TABLE `log` (
`date` date NOT NULL,
`service` varchar(255) NOT NULL,
`count` int(11) NOT NULL,
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
I found a single solution, but it not work for my
INSERT INTO log (`date`,`service`,`count`) VALUES ('2020-12-1','amazon',count+1)
ON DUPLICATE KEY UPDATE `date`='2020-12-01',`service`='amazon',`count`=`count`+1;
Are there any other solutions?

Answer 1

First, define id_key as a unique key in the table (or as the primary key):
create table log (
id_key int primary key
dt date not null,
service varchar(255) not null,
cnt int not null,
) engine=innodb default charset=utf8;
Then you can do:
insert into t1 (id_key, dt, service, cnt)
values (1, '2020-12-1', 'amazon', 1)
on duplicate key update
dt = values(dt),
service = values(service),
cnt = cnt + 1;
This attempts to insert a new row in the table, with a cnt of of 1. If id_key exists already, then it is updated instead: the date and service are updated, and the count is incremented.
If you want to use the date and service as unique keys, then do reflect that in the create table statement:
create table log (
id_key int primary key
dt date not null,
service varchar(255) not null,
cnt int not null,
unique (dt, service)
) engine = innodb default charset = utf8;
And then, it does not really make sense to update these columns on duplicate keys, so:
insert into t1 (id_key, dt, service, cnt)
values (1, '2020-12-1', 'amazon', 1)
on duplicate key update cnt = cnt + 1;