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Horizontally merge two MS Access tables into one by a common column (field).

Horizontally merge two Oracle tables into one by a common column.

Merge two tables with the same number and types of columns.

Horizontally merge two MySQL tables into one based on a common column.

Horizontally merge two MS SQL Server tables into one by a common column.

Dupehunter Professional is a fast and accurate duplicate file finding tool.

Locate and delete duplicated files from your Windows PC.

Check your articles for plagiarism by comparing with contents from the Internet.

It allows you to clean iTunes from unwanted duplicates and missing tracks.

Dupe Eliminator is 

It is designed to find duplicate songs in your music collection.

dupeGuru Picture Edition can match pictures for finding duplicates.

It is an add-in that allows you to delete duplicates in Microsoft Outlook.

Anti-Dupe for Microsoft ...Outlook. Anti-Dupe for Microsoft ...by Anti-Dupe for Microsoft 

DupeCop Desktop compares the words and phrases in the original article.

Dupe Away is a powerful iTunes duplicate remover application.

Dupe Away is a ...and more. Dupe Away instantly ...finds the dupes in iTunes