Tutorial by Topics: merges

A join combines two tables containing related columns. The term covers a wide range of operations, essentially everything except appending the two tables. "Merge" is a synonym. Type ?`[.data.table` for the official docs. x[i, on, j] # join: data.table x & data.table or list i x[!i...

The MERGE statement will merge one or more like formatted COBOL data files into a single output file. The programmer can assume control over theOUTPUT PROCEDURE, which uses the RELEASE statement, or use internal COBOL runtime mechanisms with the GIVING clause.