Ask a deadlock question.

I executed three sql in a transaction:

select * from table where mobile = ? for update
select prizeId,count(*) as amount from table where prizeRegion = ? group by prizeRegion,prizeId for update
insert into table (mobile,prizeId,prizeName,prizeRegion) values (?,?,?,?)

deadlocks occur concurrently when the table is empty, but not when there is data in the table. I don"t know what"s the problem?

Apr.24,2021
MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1c29f59-339aa.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1c29f59-339aa.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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