DB2 Insert or update solution (use Merge into to resolve a record, or a multiple-table relationship problem)

Merge into Table1 t1

Using (select Column1, column2 from table2) T2

On t1.column1 = T2.column1

When matched then update set t1.column2 = T2.column2

When not matched then insert values (COLUMN1,COLUMN2)

The above is to insert or update the data in the table2 into the Table1.

But for developers, we're working with a single record to determine whether this data is an insert or an update.

The treatment for DB2 is as follows:

Merge into Table1 t1

using (
Data in the Select Program 1 as Column1,
The data in the program is 2 as Column2 from SYSIBM. SYSDUMMY1
) T2

To ensure that T2 must have a data, is the data in your program, SYSIBM. SYSDUMMY1 is DB2 specific, and of course there are other ways you can handle it, such as SELECT COUNT (1) from any table.

On a.column1= b.column1

When matched then update set t1.column2 = T2.column2

When not matched then insert values (COLUMN1,COLUMN2)