informix merge
时间: 2023-09-28 13:07:58 浏览: 63
MERGE is a SQL command used in Informix to combine INSERT, UPDATE, and DELETE operations into a single statement. It allows you to efficiently update or insert data into a target table based on the matching conditions specified.
Here's an example of how to use the MERGE statement in Informix:
```
MERGE INTO target_table AS t
USING source_table AS s
ON t.column1 = s.column1
WHEN MATCHED THEN
UPDATE SET t.column2 = s.column2
WHEN NOT MATCHED THEN
INSERT (column1, column2) VALUES (s.column1, s.column2);
```
In this example, `target_table` is the table you want to update or insert data into, and `source_table` is the table containing the data you want to merge. The `ON` clause specifies the condition for matching rows between the two tables.
When a match is found (`WHEN MATCHED`), you can specify the column(s) to update in the target table using the `UPDATE SET` clause. When no match is found (`WHEN NOT MATCHED`), you can specify the columns and values to insert into the target table using the `INSERT` statement.
Note that the exact syntax and supported features may vary depending on the version of Informix you are using.
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