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8 mar 2016 · The main issue is that the inner query cannot be related to your where clause on the outer update statement, because the where filter applies first to the table being updated before the inner subquery even executes. The typical way to handle a situation like this is a multi-table update.
A MySQL subquery is a query nested within another query such as SELECT, INSERT, UPDATE or DELETE. In addition, a subquery can be nested inside another subquery. A MySQL subquery is called an inner query while the query that contains the subquery is called an outer query.
30 lip 2020 · Do you find subqueries useful in SELECT? Learn how to use them in INSERT, UPDATE, and DELETE and see how powerful your SQL queries can be.
26 cze 2024 · Updating table rows using subqueries in MySQL enables precise modifications based on specific conditions or values from other tables. This technique leverages subqueries within the SET or WHERE clauses of the UPDATE statement, allowing dynamic and context-specific updates.
3 paź 2024 · In this page, we are discussing the usage of a subquery to update the values of columns with the UPDATE statement. Example: Sample table : customer.
12 maj 2022 · MySqlConnection MyConn2 = new MySqlConnection(MyConnection2); MySqlCommand MyCommand2 = new MySqlCommand(Query, MyConn2); MySqlDataReader MyReader2; MyConn2.Open(); MyReader2 = MyCommand2.ExecuteReader(); MessageBox.Show("Data Updated"); while (MyReader2.Read()) { } MyConn2.Close();//Connection closed here } catch (Exception ex) { MessageBox ...
6 paź 2021 · As it's written, the subquery produces a row for every PUC_PRD_NAME. And it's asking it to write ALL these rows in the subquery for EACH row in the UPDATE statement, which is impossible. Try joining the subquery (which I've modified) to the UPDATE statement:
