Question

I’m having a strange problem with MySQL and would like to see if the community has any thoughts:

I have a table ‘tbl’ that contains

 ____________
| id | sdate  |

And I’m trying to execute this query:

select id, max(sdate) as sd from tbl where id in(123) group by id;

This returns no results.
However, this query:

select id, sdate from tbl where id in(123);

Returns many results with id’s and dates.

Why would the top query fail to produce results?

Answer 1

Turns out the index was corrupt. Running the following solved the issue:

REPAIR TABLE tbl;