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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;
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:
How we can change two variables in one condition. For example, consider that when @var1<50 , we want to change not only @var1 := @var1+col5 , but also re-assign @var2 := @var2 + 100 . In fact, regardless of the condition 2, we want to increase @var2 , if the first condition fails (the second part).
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.
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.
23 cze 2013 · I know I'm a little late to this, but I think an easier to read solution would be to use the IF () function in MySQL: UPDATE relation. SET name1 = IF(userid1 = 3, 'jack', name1), name2 = IF(userid2 = 3, 'jack', name2) WHERE (userid1 = 3 AND userid2 = 4) OR (userid1 = 4 AND userid2 = 3);
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.
