I think it would be great to `SHOW WARNINGS` as a default option (for MySQL and/or MariaDB).

example fiddle: 
https://dbfiddle.uk/?rdbms=mysql_8.0&fiddle=98b0eabadcba234d3d1bd472387604e6

```
SELECT 1/0;
SHOW WARNINGS;
```
output:
|1/0|
|--|
||null

|Level	|Code	|Message|
|--|--|--|
|Warning	|1365	|Division by 0|

and
```
SET @i=0;
SELECT @i:=@I+1;
SHOW WARNINGS;
```
output:

|@i:=@I+1|
|--|
|1|

|Level	|Code	|Message|
|--|--|--|
|Warning	|1287	|Setting user variables within expressions is deprecated and will be removed in a future release. Consider alternatives: 'SET variable=expression, ...', or 'SELECT expression(s) INTO variables(s)'.|


and maybe even ERRORS, when doing something like this:

```
WITH RECURSIVE cte1 as (
   SELECT 1 as x
   union all
   SELECT x+1 FROM cte1 WHERE x<1001)
SELECT * FROM cte1;
SHOW ERRORS;
```