You can't specify target table 't1' for update in FROM clause

The error message you mentioned is related to a MySQL query. This error occurs when you try to update a table (t1) using a subquery that refers to the same table. MySQL doesn't allow updating a table and referring to it in a subquery in the FROM clause at the same time.

To resolve this issue, you can rewrite your query by using a temporary table or by using a JOIN instead of a subquery. Here's an example using a temporary table:

CREATE TEMPORARY TABLE temp_table
SELECT * FROM t1;

UPDATE t1
SET column1 = 'new_value'
WHERE id IN (
    SELECT id
    FROM temp_table
);

DROP TEMPORARY TABLE temp_table;

In this example, we create a temporary table (temp_table) that holds the data from t1. Then we update t1 using the temporary table as a reference.

Remember to modify the column names and condition according to your specific requirements.