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WebMarketWatch provides the latest stock market, financial and business news. Get stock market quotes, personal finance advice, company news and more. WebJan 11, 2024 · Definition. Primary key is used to identify all the records in a relation uniquely. Unique key is also used to identify a record uniquely. NULL. Primary key cannot have null … WebSep 19, 2024 · Using a subquery to find each ROWID (which is a unique number given to each row in an Oracle table) and the ROW_NUMBER function to find a sequential number for that row, grouped by the fields you specify as unique. Find the ROWID values that are identified as duplicates. Delete rows that match these ROWIDs. The query looks like this: the home sanctuary louisville ky