ON THIS PAGE: You will find information about how many people are diagnosed with a brain tumor each year and some general survival information. Remember, survival rates depend on several factors. To see other pages, use the menu on the side of your screen.
Finding Duplicate Records. An even more common need is to find duplicates in a table. Perhaps you want to know how many duplicate names there are in the table so you can begin to clean up your data. To do so, create a normal Access Select Query containing the field with duplicate information. The change the query to be an Aggregate Query by clicking the Totals icon in the ribbon. Add one more field, any will do, and then set that field to be Count.. This will give you a count of records that match the name.
MORE INFORMATION. For this example, we will use the following table with duplicate PK values. In this table the primary key is the two columns (col1, col2). We cannot create a unique index or PRIMARY KEY constraint since two rows have duplicate PKs. This procedure illustrates how to identify and remove the duplicates.he last column in this result is the number of duplicates for the particular PK value. If there are only a few sets of duplicate PK values, the best procedure is to delete these manually on an individual basis. For example: The rowcount value should be n-1 the number of duplicates for a given key value.