php - sql join problem -

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i want select posts contain specific tag. i'm trying query:

select group_concat(t.tag_name) taglist posts p join posts_tags pt on p.post_id = pt.post_id join tags t on t.tag_id = pt.tag_id (p.post_private = 0) , t.tag_name = 'php' group p.post_id

problem is, query above, selects posts contain php tag, doesn't select of other tags post may contain. without and t.tag_name = 'php' part, select every tag post has, want able filter tag...

any ideas how this? i've tried many things, can't figure out...

sample data without and statement:

|| *taglist* || || php,echo  || || c++, cout ||

sample data and statement:

|| *taglist* || || php       ||

what want:

|| *taglist* || || php,echo  ||

(the posts contain php tag only)

select p.post_id, group_concat(t.tag_name) taglist     posts p         /* these 2 joins list of tags */         inner join posts_tags pt             on p.post_id = pt.post_id         inner join tags t             on pt.tag_id = t.tag_id         /* these 2 joins guarantee 'php' tag included */         inner join posts_tags pt2             on p.post_id = pt2.post_id         inner join tags t2             on pt2.tag_id = t2.tag_id                 , t2.tag_name = 'php'     p.post_private = 0     group p.post_id

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