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1 lut 2010 · Here's a query to update a table based on a comparison of another table. If record is not found in tableB, it will update the "active" value to "n". If it's found, will set the value to NULL. UPDATE tableA LEFT JOIN tableB ON tableA.id = tableB.id SET active = IF(tableB.id IS NULL, 'n', NULL)"; Hope this helps someone else.
I want to execute an UPDATE clause only in the case a specific row exists. Specifically, if a row in gallery_image exists with a specified position, I want to update all rows with a position higher than that value, flipping the sign of the position value. So this is my try: IF SELECT * FROM gallery_image WHERE position = 'X'.
11 kwi 2019 · I need to do and IF/THEN statement in mysql based on whether a value exists in a column. If it exists, I need to perform an update on the record and if it does not, then an error should be thrown. I want to check that the siteID actually exists. How can I add an "IF EXISTS" statement?
29 kwi 2015 · IF EXISTS (select * from users where username = 'something') THEN. update users set id= 'some' where username = 'something'; ELSE. insert into users (username) values ('something'); END IF; end $$. delimiter ; and call it like this: call select_or_insert();
If you access a column from the table to be updated in an expression, UPDATE uses the current value of the column. For example, the following statement sets col1 to one more than its current value: UPDATE t1 SET col1 = col1 + 1;
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:
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. My table is 'relation': userid1 | userid2 | name1 | name2. I got for example: SELECT * . FROM relation . WHERE (userid1 = 3 AND userid2 = 4) OR (userid1 = 4 AND userid2 = 3); . Output:
