getting error in sql: Every derived table must have its own alias -

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need in fixing error,trying run query , getting error every derived table must have own alias, below code:

$sql="select trouble_type_priority, category_1, category_2, status, count(*) ( select distinct trouble_type_priority, category_1, category_2 tbl_main ) group trouble_type_priority,category_1,category_2 having count(*) > 1";

you need give subquery "alias", or name.

notice addition of a after subquery:

$sql="select trouble_type_priority, category_1, category_2, status, count(*) ( select distinct trouble_type_priority, category_1, category_2 tbl_main ) group trouble_type_priority,category_1,category_2 having count(*) > 1";

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