actuaact i see 100*tag1(note 100 is the no of questions tagged with tag1) in the tag page
but when i click tag1, no questions are displayed.
i imported those questions with that tag, tag1 in phpmyadmin
I ran reindex manytimes after i imported
You need to have both: the tags field populated in the ^posts table as well as the foreign keys to the tags themselves, which are the ones in ^posttags.
I wouldn't advice to modify the database unless you 100% know what you are doing.
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