select - mysql using calculated column at where/having -

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i have question how use "alias" column @ where/having clause. know there question related topic. search trough web , on stackoverfolw , doesn't find solution.

so hope @ way..

the following statement works well:

select phrase,count(*)      my_statistics      timestamp>now()-interval 7 day     group phrase order desc      limit 16;

phrase , timestampare columns @ table. code selects top 16 phrases, inserts users on last 7 days. there exist column user , select top 16 phrases inserted more 1 user. tried this:

select phrase,count(*) a, count(distinct(user)) b     my_statistics     timestamp>now()-interval 7 day           , b>1     group phrase order desc      limit 16;

on other questions on stackoverflow fond info, have use having

select phrase,count(*) a, count(distinct(user)) b     my_statistics     timestamp>now()-interval 7 day           group phrase order desc      having b>1     limit 16;

but returns error:

you have error in sql syntax; check manual corresponds mysql server version right syntax use near 'having b>1 limit 16' @ line 5

i have no idea, how right syntax be. hope kind of here. thank you!

place order desc after having clause.

select phrase,         count(*)                a,         count(distinct( user )) b    my_statistics   timestamp > now() - interval 7 day  group  phrase  having b > 1  order  desc  limit  16;

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