how to get the point's elevation from raster database

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I download some *.tif files from http://srtm.csi.cgiar.org/.Then I use gdal2wktraster.py to store them into my postgresql with postgis extension. Args are python gdal2wktraster.py -r *.tif -t srtm_test -s 4326 -k 200x200 -I.

Now I got a point with latitude and longitude.But I got more than 70k lines in srtm_test table.I do not know how to location the point to find the rid.



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