MySQL 使用相同的查询在 PHP 和 PHPMyadmin 上返回不同的结果

Question

1- Here is simple php code retrieving MySQL rows

2- Here is return result of above code with query.

3- But when I copy paste same query in phpmyadmin 100% sure on same database It returns different result. See screenshot below;

This blow up my mind, trying to figure out since two days but didn't find any solution. What could be possible issue?

Answer 1

Your query is an aggregation query that has group by t.destination .

However, it selects a bunch of other columns that are not arguments to aggregation functions. There is no evidence that they are functionally dependent on t.destination either.

Happily, such sloppiness generates a syntax error on most databases. Happily, it generates a syntax error in the more recent versions of MySQL (using the default settings). Unhappily. some people write such queries on older versions of MySQL (or change the flag that controls this). . . and then wonder why the code doesn't work as expected.

The extra values come from an indeterminate matching row within each group. Running the query at different times might result in different values for those "bare" columns. Running with different settings (or different sources) also might also result in different results.