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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.
UPDATE table2 t2 JOIN table1 t1 ON t1.id = t2.id SET t2.name = t1.name; RESULTS WITH JOIN. if you are set on doing it with a select you could do it like this. UPDATE table2 t2, ( SELECT Name, id FROM table1 ) t1 SET t2.name = t1.name WHERE t1.id = t2.id RESULTS FROM SELECT
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.
A MySQL subquery is a query nested within another query such as SELECT, INSERT, UPDATE or DELETE. Also, a subquery can be nested within another subquery. A MySQL subquery is called an inner query whereas the query that contains the subquery is called an outer query.
4 sie 2024 · Ever found yourself needing to update a bunch of rows in your database, but the condition for the update depends on data from another table? That’s where UPDATE with a subquery comes in handy. Let’s break it down.
6 paź 2021 · UPDATE lty_prd_u_cost a LEFT JOIN ( SELECT PUC_PRD_NAME, PUC_AVG_UCOST FROM ( SELECT PUC_PRD_NAME, PUC_AVG_UCOST ,row_number() over (partition by PUC_PRD_NAME order by PUC_DATE desc) as rn FROM lty_prd_u_cost ) b0 WHERE b0.rn = 1 ) b ON a.PUC_PRD_NAME = b.PUC_PRD_NAME SET a.PUC_AVG_UCOST = b.PUC_AVG_UCOST WHERE a.PUC_AVG_UCOST=0 and a.PUC_DATE ...
1 lis 2023 · To update a MySQL query based on a select query, you can use the UPDATE statement with a subquery. This allows you to update rows in one table based on the values returned from a select query on another table.
