Скачать или смотреть Oracle - MERGE Statement | How to merge statement | Oracle Merge Statement | Oracle Merge

MERGE Statement
• Provides the ability to conditionally update, insert, or delete
data into a database table
• Performs an UPDATE if the row exists, and an INSERT if it
is a new row
MERGE Statement Syntax:
You can conditionally insert, update, or delete rows in a table
by using the MERGE statement.
MERGE INTO table_name table_alias
USING (table|view|sub_query) alias
ON (join condition)
WHEN MATCHED THEN
UPDATE SET
col1 = col1_val,
col2 = col2_val
WHEN NOT MATCHED THEN
INSERT (column_list)
VALUES (column_values);

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