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23 cze 2013 · I am trying to UPDATE values from a table, but I need to add some conditions. I found the function CASE, but I am not if it is the best method. Here is an example.
In this article, we would like to show you UPDATE query with IF condition in MySQL. Quick solution: UPDATE `table_name` SET `column_name` = IF(condition , if_true, if_false); Practical example. To show UPDATE query with IF condition, we will use the following users table:
In SQL terms it should look like this: INSERT INTO daily_events (created_on, last_event_id, last_event_created_at) VALUES ('2010-01-19', 23, '2010-01-19 10:23:11') ON DUPLICATE KEY UPDATE last_event_id = VALUES(last_event_id), last_event_created_at = VALUES(last_event_created_at) WHERE last_event_created_at < VALUES(last_event_created_at);
16 kwi 2016 · UPDATE Tests AS old INNER JOIN ( SELECT 10 AS TestId, 25 AS TestSubId, 1000 AS TestScore, 2000 AS TestScore2 UNION ALL SELECT 11, 22, 1100, 2100 ) AS new ON old.TestId = new.TestId AND old.TestSubId = new.TestSubId SET old.TestScore = new.TestScore, old.TestScore2 = new.TestScore2 ;
Each value can be given as an expression, or the keyword DEFAULT to set a column explicitly to its default value. The WHERE clause, if given, specifies the conditions that identify which rows to update.
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.
Each value can be given as an expression, or the keyword DEFAULT to set a column explicitly to its default value. The WHERE clause, if given, specifies the conditions that identify which rows to update.
