Thank you. Then I will create a separate index on site_no.
>SQL Server cannot use this index for site_no
>
>>
>>I am changing the index tags for many SQL Server tables and would like to understand something.
>>
>>Here is an example and a question. Say I have a table with a Char field/column (CUSTOMER_ID) and an Integer field/column (SITE_NO). I create a unique index key on thee two column; as the following:
>>
>>CREATE UNIQUE INDEX PX_CUST_SITE ON MyTable (customer_id, site_no )
>>
>>When a SQL Select will be executed against either one of these fields, customer_id or site_no, will SQL Server use this index? Or I need to create to more separate indexes, one on CUSTOMER_ID and another on SITE_NO?
>>TIA
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