Sql updating table values

How do you go about producing a summary result in which a distinguishing column from each row in each particular category is listed in a 'aggregate' column?A simple, and intuitive way of displaying data is surprisingly difficult to achieve.

Note: Updating a table with indexes takes more time than updating a table without (because the indexes also need an update).So, only create indexes on columns that will be frequently searched against.It is an interesting problem in Transact SQL, for which there are a number of solutions and considerable debate.(Talking about 1NF violations in a language like SQL which lacks sufficient domain support, allows NULLs and supports duplicates is somewhat ironic to begin with, but that is a topic which requires detailed explanations.) By ‘Concatenating row values’ we mean this: You have a table, view or result that looks like this……and you wish to have a resultset like the one below: In this example we are accessing the sample North Wind database and using the following SQL The objective is to return a resultset with two columns, one with the Category Identifier, and the other with a concatenated list of all the Product Names separated by a delimiting character: such as a comma.Concatenating column values or expressions from multiple rows are usually best done in a client side application language, since the string manipulation capabilities of Transact SQL and SQL based DBMSs are somewhat limited.

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