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not all indexes used in query?

Posted By:      Posted Date: September 02, 2010    Points: 0   Category :Sql Server
hello, I have this query with several joined tables, and i have created an index on the columns used in the joins. in the query below I join tables hr200, hr300, hr301 and dim_datum. I created the following indexes: In hr200: index on hr200_obj in hr300: index on hr300_obj, hr200_obj in hr301: index on hr301_obj, hr300_obj in dim_datum: index on datum_id, datum But when i run below query, only the index on dim_datum is used. What to do to malke the query use the other indexes too?   SELECT   dbo.hr300.hr300_obj AS ziekmeldingID, dbo .hr300.hr300_date_start AS ZiekStartDatum, CASE   WHEN dbo.hr300.hr300_date_end IS NOT NULL   THEN dbo.hr300.hr300_date_end   ELSE getdate() END   AS ZiekEindDatum, dbo .hr300.hr300_time_start AS ZiekStartTijd, dbo .hr300.hr300_time_end AS ZiekEindTijd, dbo .hr300.hr300_open AS ZiekOpen, dbo .hr300.hr104_obj AS ZiekTypeID, dbo .hr300.hr038_obj AS ZiekRedenID, dbo .hr300.hr200_obj AS hrmID, CAST   (CONVERT(char(8), dbo.hr300.hr300_date_start, 112) AS int) AS ZiekStart_KEY, CAST   (CONVERT(char(8), dbo.hr300.hr300_date_end, 112) AS int) AS ZiekEind_KEY, DATEDIFF   (dd, dbo.hr300.hr300_date_start, dbo.hr300.hr300_date_end) AS Verzuimduur, dbo .hr301.hr301_date, dbo .hr301.hr301_percentage_sick / 100 AS PercentageZiek, dbo .hr301.hr301_percentage_recovered

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