Occasionally I need to update or delete rows from a heap table (meaning it contains no primary key). When dark forces align, all the columns have duplicate data. This makes DELETE or UPDATE trivially more tricky than using a simple WHERE clause, but I find myself needing to double-check the syntax. The sticky point is the parentheses surrounding the row count, which is different than my similar usage on the SELECT statement. I am recording it here for future reference:
— to delete only one of several rows that have no data to distinguish each row:
–UPDATE TOP (1) conformal_coat set thickness=’112150102′ where serial_number_id =’54476092-B176-4B46-907C-CA7DABE3FB83′
I did not check whether this also works on the DELETE statement, but it will be easy to check the next time this occurs. After UPDATING a column of one of the rows’ values to be unique, the unique value can be added to a WHERE clause to update only the single row desired.
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–delete from conformal_coat where thickness=’112150102′ and serial_number_id =’54476092-B176-4B46-907C-CA7DABE3FB83′
See also: http://stackoverflow.com/questions/2909118/update-a-single-row-with-t-sql