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Then , the functions must all have distinct C names but they can be declared with the same SQL names ( as long as their argument types differ , of course ) . Several routines ( such as the hash access method , hash join and the sort algorithm ) compute functions of the raw bits contained in your structure . Mechanical engineers can make our lives more comfortable by designing more efficient transportation and delivery systems for raw materials or products - - improving the use of cryogenic techniques for super-conductivity ; improving the work environment through increased use of automation and robotics , more efficient heating , ventilation or refrigeration . Engineers Without Borders , like ASME , encourages volunteerism and accomplishes outstanding work with engineers serving as positive and supportive mentors to students . But unlike hashjoin , where the left and right data types had better be the same ( or at least bitwise equivalent ) , it is possible to mergejoin two distinct data types so long as they are logically compatible . Obviously , the low rates of participation in 1970 were indicative of social , and not genetic , barriers to success . Postgres allows function " overloading " ; that is , the same name can be used for several different functions so long as they have distinct argument types . He suggested that , since fewer girls than boys have top scores on science and math tests in late high school , perhaps genetic , rather than social , differences explain why so few women are successful in these fields . ) Thus , with a cache setting of one it is safe to assume that nextval values are generated sequentially ; with a cache setting greater than one you should only assume that the nextval values are all distinct , not that they are generated purely sequentially . Furthermore , although multiple backends are guaranteed to allocate distinct sequence values , the values may be generated out of sequence when all the backends are considered . Thank you , Engineers Without Borders , for your outstanding accomplishments — and for raising the stature of the engineering profession . For the planned restoration of thousands of acres of former commercial salt ponds to tidal wetlands , a crucial question is whether there is enough sediment to build and maintain wetlands as sea level rises .