sql Query Time out error

I have a table which have 6 million recods,when a fir开发者_JS百科e select query with where condition in that table it is timing out.

How can I make it run, Please help

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Assuming there aren't any indexes, add an index to the appropriate column(s).

If you need a more detailed answer, you need to provide more information, including the table schema, the query, and the indexes already against the table.

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Either

1. You haven't got any indexes on the columns in your where condition
2. Your where condition/whole query is inefficient.

Please post your SQL