DB2 Update Table Using Another Table

1 year ago
Jackson Davis
1 minute

To update one table based on another table, you can use the UPDATE statement combined with a JOIN clause. Here is an example:

Suppose we have two tables, A and B, and we want to update the data in table B based on the data in table A. We can follow the steps outlined below.

  1. Write an UPDATE statement specifying the table B and the field to be updated.
UPDATE B
  1. Join tables A and B together using a JOIN clause, specifying the conditions for the connection.
UPDATE B
INNER JOIN A ON B.id = A.id
  1. Specify the fields to be updated and their corresponding values:
SET B.column_name = A.column_name
  1. You can add a WHERE clause to filter the data that needs to be updated.
WHERE A.condition = 'value'

The final UPDATE statement is as follows:

UPDATE B
INNER JOIN A ON B.id = A.id
SET B.column_name = A.column_name
WHERE A.condition = 'value'

Please modify the table name, fields, and conditions based on the actual situation before executing the above update statement to update the data in table B based on the data in table A.

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