mysql - SELECT COUNT messes with ORDER BY -



mysql - SELECT COUNT messes with ORDER BY -

i have problem don't understand. query

select f.*, ftv.content, ftv.updated, count(ftv.file_number) versions files f inner bring together files_text_versions ftv on ftv.file_number = f.file_number f.file_number = '%s' order ftv.updated desc limit 1

totally ignores order statement, if remove the

count(ftv.file_number) versions

the query runs fine , orders should.

why that, , how prepare it?

sql fiddle same problem 1 table:

http://sqlfiddle.com/#!2/c8f124/2

your count(*) turns query aggregation query. without group by, returns 1 row. although in other databases error, mysql allows syntax.

you can prepare adding group by. however, have problem other 2 columns ftv. can values want clever aggregation:

select f.*, substring_index(group_concat(ftv.content order ftv.updated desc), ',', 1) content, max(ftv.updated) updated, count(ftv.file_number) versions files f inner bring together files_text_versions ftv on ftv.file_number = f.file_number f.file_number = '%s' grouping t.file_number order updated desc limit 1;

mysql

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