Search code examples
mysqlsqldb2

db2 equivalent of MySql REPLACE INTO

I very useful statement I like of MySql is REPLACE INTO table that is 'REPLACE a value if-exist OR INSERT INTO table If-Not-Exist'.

The documentation of db2 REPLACE is for a function operating on strings only so not with that meaning.

Is there any equivalent in db2? Right now I am looking also for keywords IF EXSTS/IF NOT EXIST.

Solution

  • DB2 uses the SQL standard MERGE statement to do basically the same thing. The syntax is different:

    MERGE INTO table_to_upsert AS tab
USING (VALUES
        (1, 2, 3),
        (4, 5, 6),
        (7, 8, 9)
        -- more rows
    ) AS merge (C1, C2, C3)
    ON tab.key_to_match = merge.key_to_match
    WHEN MATCHED THEN
        UPDATE SET tab.C1 = merge.C1,
                   tab.C2 = merge.C2,
                   tab.C3 = merge.C3
    WHEN NOT MATCHED THEN
        INSERT (C1, C2, C3)
        VALUES (merge.C1, merge.C2, merge.C3)