sql-delete

问题 I know the title may seem strange but this is what I want to do: I have table with many records. I want to get some of this records and insert them in other table. Something like this: INSERT INTO TableNew SELECT * FROM TableOld WHERE ... The tricky part is that I want this rows that I have inserted to be deleted form the origin table as well. Is there a easy way to do this, because the only think that I have managed to do is to use a temporary table for saving the selected records and then

问题 I know the title may seem strange but this is what I want to do: I have table with many records. I want to get some of this records and insert them in other table. Something like this: INSERT INTO TableNew SELECT * FROM TableOld WHERE ... The tricky part is that I want this rows that I have inserted to be deleted form the origin table as well. Is there a easy way to do this, because the only think that I have managed to do is to use a temporary table for saving the selected records and then

问题 I designed below query for my delete operation. I am new to SQL and just wanted to check with experienced people here if it is fine or any better way to do this. I am using DB2 database DELETE FROM TableD WHERE B_id IN ( SELECT B.B_id FROM TableB tB INNER JOIN TableA tA ON tB.A_id = tA.A_id WHERE A_id = 123 ) AND C_id IN (1,2,3) This has two IN clause which I am little worried and not sure if I could use EXISTS clause anywhere. Database Structure as below: Table A has ONE TO MANY relation

问题 I designed below query for my delete operation. I am new to SQL and just wanted to check with experienced people here if it is fine or any better way to do this. I am using DB2 database DELETE FROM TableD WHERE B_id IN ( SELECT B.B_id FROM TableB tB INNER JOIN TableA tA ON tB.A_id = tA.A_id WHERE A_id = 123 ) AND C_id IN (1,2,3) This has two IN clause which I am little worried and not sure if I could use EXISTS clause anywhere. Database Structure as below: Table A has ONE TO MANY relation

问题 I am trying to delete data from two related tables - primary key in the table users and foreign key in the table login - but I'm getting error PL/SQL: ORA-00933: SQL command not properly ended . Create table users and primary key: /* table user*/ create table users (id_user number(10) not null, name_user varchar(30) not null); /* primary key */ alter table users add constraint user_pk primary key (id_user); Create table login and primary key and foreign key: /* table login*/ create table

问题 This question already has answers here : MySQL Error 1093 - Can't specify target table for update in FROM clause (15 answers) Closed 2 years ago . after selecting records i want to delete that records..i tried following query - (after removing ,MAX(value) but its showing- You can't specify target table 'test' for update in FROM clause DELETE FROM test WHERE ext_no IN ( SELECT ext_no, MAX(value) FROM test GROUP BY ext_no HAVING COUNT(*) > 2 AND COUNT(*) = COUNT(CASE value WHEN 0 THEN 1 END) );

问题 This question already has answers here : MySQL Error 1093 - Can't specify target table for update in FROM clause (15 answers) Closed 2 years ago . after selecting records i want to delete that records..i tried following query - (after removing ,MAX(value) but its showing- You can't specify target table 'test' for update in FROM clause DELETE FROM test WHERE ext_no IN ( SELECT ext_no, MAX(value) FROM test GROUP BY ext_no HAVING COUNT(*) > 2 AND COUNT(*) = COUNT(CASE value WHEN 0 THEN 1 END) );

问题 This question already has answers here : MySQL Error 1093 - Can't specify target table for update in FROM clause (15 answers) Closed 2 years ago . after selecting records i want to delete that records..i tried following query - (after removing ,MAX(value) but its showing- You can't specify target table 'test' for update in FROM clause DELETE FROM test WHERE ext_no IN ( SELECT ext_no, MAX(value) FROM test GROUP BY ext_no HAVING COUNT(*) > 2 AND COUNT(*) = COUNT(CASE value WHEN 0 THEN 1 END) );

问题 I've got an inactive system. It is supposed to delete users from inactive table after 15 minutes. I have also a code that logs the user out if it cant be found in that table. The inactive script updates user on every page refresh. This is the inactive code I tried and it doesn't work so far: $result = mysqli_query($con,"SELECT * FROM inactive"); while($row = mysqli_fetch_array($result)) if ($row['inactive'] > timestampadd(MINUTE, -15, now())) { }else { $db_query = "DELETE FROM inactive WHERE

问题 After running a query like delete from table tablename Can the records be recovered? From what I know Postgresql is just marking the records as deleted. 回答1: Try pg file dump. Source. 来源： https://stackoverflow.com/questions/6151632/recoved-deleted-rows-in-postgresql