Bug #103665 The aliases interferes despite the fact that the database is specified
Submitted: 12 May 2021 5:48 Modified: 12 May 2021 7:52
Reporter: Владислав Сокол Email Updates:
Status: Verified Impact on me:
None 
Category:MySQL Server: Parser Severity:S3 (Non-critical)
Version:8.0.23, 5.7.34, 8.0.24 OS:Any
Assigned to: CPU Architecture:Any

[12 May 2021 5:48] Владислав Сокол 
Description:
The tables are not distinguished correctly when their aliases are the same despite the fact that the database is explicitly specified.

How to repeat:
CREATE DATABASE db1;
CREATE TABLE db1.t(a INT);
INSERT INTO db1.t VALUES (1);

mysql> UPDATE db1.t, (SELECT 1 AS a) AS t SET db1.t.a=2;
Query OK, 1 rows affected (0.06 sec)
Rows matched: 1  Changed: 1  Warnings: 0

mysql> UPDATE (SELECT 1 AS a) AS t, db1.t SET db1.t.a=2;
ERROR 1288 (HY000): The target table t of the UPDATE is not updatable

Suggested fix:
Assign unique alias to each table in a query.
[12 May 2021 7:52] MySQL Verification Team 
Hello Владислав Сокол,

Thank you for the report and feedback.

regards,
Umesh
[14 May 2021 6:09] MySQL Verification Team 
Bug #103694 marked as duplicate of this one