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1 lut 2010 · How do I update a table and set different values upon the condition evaluating to True. For instance : UPDATE Table SET A = '1' IF A > 0 AND A < 1 SET A = '2' IF A > 1 AND A < 2 WHERE A IS NOT NULL;
20 lip 2014 · The period is set in seconds or as a number of collected values (preceded by a # hash mark) in the first parameter. For example, a trigger which will fire if the value has not changed for 10 minutes: {mysql.query.delta(600)}=0.
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:
The WHERE clause, if given, specifies the conditions that identify which rows to update. With no WHERE clause, all rows are updated. If the ORDER BY clause is specified, the rows are updated in the order that is specified. The LIMIT clause places a limit on the number of rows that can be updated.
13 lip 2015 · UPDATE: I created the following index based on ypercube's response, but this increases the query time for the first query to around 17 seconds! ALTER TABLE writetest_table ADD INDEX time_on__diff_ms__ix (time_on, diff_ms) ;
The IF statement allows you to evaluate one or more conditions and execute the corresponding code block if the condition is true. The IF statement has three forms: IF...THEN statement: Evaluate one condition and execute a code block if the condition is true.
4 sie 2015 · You can compare now() with the row's date column plus 5 minutes: UPDATE mytable SET status = 'EXPIRED' WHERE DATE_ADD(date_col, INTERVAL 5 MINUTE) <= NOW()