Oracle in a Nutshell

Name

MERGE

Synopsis

MERGE INTO table_name [alias] 
  USING {table_name | viewname | subquery} 
ON (condition)
WHEN MATCHED THEN merge_update_clause
WHEN NOT MATCHED THEN merge_insert_clause

Selects rows from a table for update of or insert into another table. This statement is used to avoid multiple INSERT and UPDATE statements. New with Oracle9i Release 2.

Keywords

INTO

Specifies the name of the target table, that is, the table that will be updated or have rows inserted.

USING

Specifies the name of the table, view, or subquery from which rows are to be selected.

ON (condition)

Specifies a condition that will evaluate to either TRUE or FALSE. This is a SQL clause, and is typically a test for equality.

merge_update_clause

Specifies a SQL DML statement to be performed if condition is TRUE. This is normally an UPDATE statement.

merge_insert_clause

Specifies a SQL DML statement to be performed if condition is not TRUE. This is normally an INSERT statement.

Common keywords and clauses: alias, table_name.