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the first paragraph: As an example, say we wish to find all the records that are in the temperature range of other records. In effect, we need to compare the temp_lo and temp_hi attributes of each EMP instance to the temp_lo and temp_hi attributes of all other EMP instances. I believe that EMP should read WEATHER, as the example query that follows joins WEATHER to itself. EMP is often used in Oracle examples. Regards, Graham Other RULE cleanups |
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