Merge, merging, or merger may refer to:

• Merger (politics), the combination of two or more political or administrative entities such as municipalities into a single entity
• Mergers and acquisitions, the buying, selling, dividing and combining of different companies
• Merger doctrine (disambiguation) in law, multiple distinct uses according to law specialty
• Merge (linguistics), one of the basic syntactic operations in generative syntax in the Minimalist Program
• Merger (phonology), a type of phonological change whereby two sounds that were originally separate phonemes come to be pronounced exactly the same

A relational database management system uses SQL MERGE (upsert) statements to INSERT new records or UPDATE existing records depending on whether or not a condition matches. It was officially introduced in the standard, and expanded in the standard.

Merge [] (engl.: to merge „vereinigen, zusammenführen“) ist der Vorgang des Abgleichens mehrerer Änderungen, die an verschiedenen Versionen derselben Dateien getätigt wurden.

Merge è un tipo di tabella di MySQL. Una tabella di tipo Merge è una collezione di tabelle MyISAM aventi le stesse colonne e gli stessi indici. Le colonne e gli indici devono avere gli stessi nomi, lo stesso ordine e le stesse caratteristiche in tutte le tabelle MyISAM che fanno parte della stessa Merge. Esse però non devono necessariamente trovarsi nello stesso database e possono avere formati e opzioni (PACK_KEYS, MAX_ROWS...) differenti.