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9 lis 2015 · Through phpMyAdmin I need to make global updates to some tables, specifically I want to update all FieldValue entries to "United States of America" with the FieldName "country" that have the same FormID as the FieldName "city" and the FieldValue "Houston".
What I want to do is update all of the fields with a language_id of 2 to be equal to the same product_id where the language_id is 1. So far I've tried the following query, but I'm getting errors indicating that MySQL doesn't want to update a table where the table's also being used in the subquery.
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.
In general you can use the same table in a sub-query. It's just that MySQL has a (stupid IMHO) restriction which prevents you of doing that in UPDATE or DELETE statements. –
30 mar 2015 · When I try to do this, I get an error saying I cannot use the same table in where select as the column that I am updating. UPDATE table_name SET quantity = 19 WHERE productID = 148357 AND productCost IS NOT NULL AND exampleDate1 >= (SELECT min(exampleDate1) FROM table_name WHERE exampleDate1 >= (SELECT min(exampleDate) FROM table_name2 WHERE ...
You cannot update a table and select directly from the same table in a subquery. You can work around this by using a multi-table update in which one of the tables is derived from the table that you actually wish to update, and referring to the derived table using an alias.
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.
