sql-delete

I read this article but it seems not work for delete. I got this error when tried to create a trigger: Executing SQL script in server ERROR: Error 1363: There is no NEW row in on DELETE trigger CREATE TRIGGER DeviceCatalog_PreventDeletion BEFORE DELETE on DeviceCatalog FOR EACH ROW BEGIN DECLARE dummy INT; IF old.id = 1 or old.id =2 THEN SELECT * FROM DeviceCatalog WHERE DeviceCatalog.id=NEW.id; END IF; END; SQL script execution finished: statements: 4 succeeded, 1 failed Try something like this - DELIMITER $$ CREATE TRIGGER trigger1 BEFORE DELETE ON table1 FOR EACH ROW BEGIN IF OLD.id = 1

I need to do this DELETE FROM konta WHERE taken != '' But != doesn't exist in mysql. Anyone know how to do this? DELETE FROM konta WHERE taken <> ''; The != operator most certainly does exist! It is an alias for the standard <> operator. Perhaps your fields are not actually empty strings, but instead NULL ? To compare to NULL you can use IS NULL or IS NOT NULL or the null safe equals operator <=> . You may be using old version of Mysql but surely you can use DELETE FROM konta WHERE taken <> '' But there are many other options available. You can try the following ones DELETE * from konta WHERE

This question already has an answer here: How to delete multiple rows in SQL where id = (x to y) 5 answers This is probably a very simple question for somebody with experience, but I just wanted to know the safest way to delete a couple of hundred records in an SQL table that fall between a specific range. For example I need to delete rows with an ID between 79 & 296: My worry is if I say delete everything with an ID (>79 AND < 296) then it may literally wipe the whole table. if you use Sql Server delete from Table where id between 79 and 296 After your edit : you now clarified that you want :

I am trying to delete all voters from a voters table where they are not registered as a democrat or republican AND only voted once. I have a database with three tables, congress_members, voters, and votes and have to JOIN votes with voters in order to delete the right data. This code finds the data I want to delete: SELECT voters.* FROM voters JOIN votes ON voters.id = votes.voter_id WHERE party = 'green' OR party = 'na' OR party = 'independent' GROUP BY votes.voter_id HAVING COUNT(*) = 1; But I am unable to delete it because I am getting an error everytime I try to delete with a JOIN

I'm trying to delete 267 records out of about 40 million. The query looks like: delete from pricedata where pricedate > '20120413' pricedate is a char(8) field. I know about adjusting innodb_buffer_pool_size , but if I can do select from pricedata where pricedate > '20120413' and get 267 records (and that's all there are), no errors, why does it choke on the delete? And if adjusting innodb_buffer_pool_size doesn't work, what should I do? It seems that you don't have an index on pricedate (or MySQL does not use this index for some reason). With REPEATABLE READ (the default transaction isolation

I want to remove all rows that i entered from my SQLite database table. The table name is tbltask . I tried to drop the table and delete * from table, but those are giving me runtime errors. I want to trigger this event in Button OnClickListner event. Following code is what I tried: String delete = "DELETE FROM "+DATABASE_TABLE; db.rawQuery(delete, null); db.delete(DATABASE_TABLE, null, null); LogCat: 11-15 17:45:04.660: DEBUG/AndroidRuntime(300): Shutting down VM 11-15 17:45:04.660: WARN/dalvikvm(300): threadid=1: thread exiting with uncaught exception (group=0x4001d800) 11-15 17:45:04.710:

I have a table taged with two fields sesskey (varchar32 , index) and products (int11), now I have to delete all rows that having group by sesskey count(*) = 1. I'm trying a fews methods but all fails. Example: delete from taged where sesskey in (select sesskey from taged group by sesskey having count(*) = 1) The sesskey field could not be a primary key because its repeated. DELETE si FROM t_session si JOIN ( SELECT sesskey FROM t_session so GROUP BY sesskey HAVING COUNT(*) = 1 ) q ON q.sesskey = si.sesskey You need to have a join here. Using a correlated subquery won't work. See this article