How would you suggest I try to track down this problem? I run the following query: SELECT a.* FROM compliance_2006 a, ers_regions b WHERE a.fips_st_cd=b.fips_st AND a.fips_cnty_cd=b.fips_cou AND b.region =1 AND a.fips_st_cd='17' AND a.fips_cnty_cd='003'; and it works. But when I try this: SELECT a.* FROM compliance_2006 a, ers_regions b WHERE a.fips_st_cd=b.fips_st AND a.fips_cnty_cd=b.fips_cou AND b.region =1 AND a.fips_st_cd='17' ; psql dies with the message: Segmentation Fault. Any suggestions? ---------------------------(end of broadcast)--------------------------- TIP 9: In versions below 8.0, the planner will ignore your desire to choose an index scan if your joining column's datatypes do not match