Search results
10 mar 2011 · I'm not sure if this would be the best way to go about it, but I'm thinking about using an UPDATE statement with multiple IF conditions. Something like: UPDATE `orders` SET `orderPriority` = 1 IF(`orderPriority` = 2) OR `orderPriority` = 2 IF(`orderPriority = 3) OR `orderPriority` = 3 IF(`orderPriority` = 1);
27 gru 2013 · You're confusing an update with a condition with a conditional update. For example the following is an update with a condition: UPDATE x SET y=IF(a=b, c, d) This is a conditional update: UPDATE x SET y=c WHERE a=b The first version is applied to all rows, the second to all matching rows. Use a WHERE clause to limit what rows your UPDATE is ...
16 kwi 2016 · However, given how the conditions are re-used in your UPDATE statement, you could also take a different approach altogether: represent the affected IDs and the new values as a derived table and use an update with a join:
In both cases the NEW and OLD virtual tables refer to the table the trigger is defined on. NEW contains the new version of the row that was inserted or changed. OLD contains the pre-change version of the row. OLD is only defined in an update trigger as there is no old version on an insert.
25 kwi 2024 · The MySQL UPDATE statement is used to update columns of existing rows in a table with new values. Version: 5.6. Syntax : Single table: UPDATE [LOW_PRIORITY] [IGNORE] table_reference SET col_name1= {expr1|DEFAULT} [, col_name2= {expr2|DEFAULT}] ... [WHERE where_condition] [ORDER BY ...] [LIMIT row_count] Multiple tables:
The IF statement can have THEN, ELSE, and ELSEIF clauses, and it is terminated with END IF. If a given search_condition evaluates to true, the corresponding THEN or ELSEIF clause statement_list executes. If no search_condition matches, the ELSE clause statement_list executes.
19 lip 2012 · @Cade Roux's solution gives me a syntax error, the correct one for mysql 5.5.29 is: UPDATE ips INNER JOIN country ON ips.iso = country.iso SET ips.countryid = country.countryid without the "FROM" keyword.
