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26 Νοε 2009 · There is no 'DROP TABLE IF EXISTS' in oracle, you would have to do the select statement. try this (i'm not up on oracle syntax, so if my variables are ify, please forgive me): declare @count intselect @count=count(*) from all_tables where table_name='Table_name';if @count>0BEGIN DROP TABLE tableName;END. Share.
30 Αυγ 2015 · 5. You can use below query to fetch the references of table which should be dropped before dropping the table. select table_name, constraint_name, status, owner. from dba_constraints. where 1=1. --and r_owner = :p_owner --if you know schema. and constraint_type = 'R'. and r_constraint_name in.
10 Οκτ 2011 · 2. It’s clear from @Randy comment, just to add on: (1) Drop Table Tablename: Without purge, the table can be in the RECYCLEBIN or USER_RECYCLEBIN; which can be restored using the command FLASHBACK. This is similar to files we delete in our windows desktop, which move to the recycle bin, and can be restored back. (2) Drop Table Tablename Purge:
5 Απρ 2014 · s.executeUpdate("DROP TABLE IF EXISTS employee") But depending on your verions, you could also use this: IF OBJECT_ID('dbo.employee', 'U') IS NOT NULL DROP TABLE dbo.employee Answer taken from: here, also this seems like it might be a duplicate of the same post? I would highly, highly recommend reading the SQL Documentation, and trying to do a ...
30 Ιαν 2011 · In a production system, it really depends. For oracle 10g and older, you could execute . LOCK TABLE mytable in exclusive mode; alter table mytable modify mycolumn varchar2(5); In a separate session but have the following ready in case it takes too long. alter system kill session '....
5. You can do two things. define the exception you want to ignore (here ORA-00942) add an undocumented (and not implemented) hint /*+ IF EXISTS */ that will pleased your management. . declare table_does_not_exist exception; PRAGMA EXCEPTION_INIT (table_does_not_exist, -942); begin execute immediate 'drop table continent /*+ IF EXISTS ...
13 Μαρ 2019 · user1799846. 873. 3. DELETE from table_name where rowid not in (select min (rowid) FROM table_name group by column_name); and you can also delete duplicate records in another way. DELETE from table_name a where rowid > (select min (rowid) FROM table_name b where a.column=b.column); answered Jan 7, 2017 at 6:34. Md Wasi.
SQL> create global temporary table t (data varchar2(4000)); Table created. Use the table in another session. (Notice no commit or anything after the insert.) SQL> insert into t values ('whatever'); 1 row created. Back in the first session, attempt to drop: SQL> drop table t; drop table t.
26 Νοε 2018 · 12. ORA-00054 means some other session has a lock on a database object which prevents our action from completely successfully. Your scenario as you present it is a trifle confused, but basically somebody has a lock on the table - probably they are xecuting some DML against it - and you won't be able to drop it until they release that lock (i.e ...
17 Ιουν 2009 · 514. 1. If you are doing in code then first check for table in database by using query SELECT table_name FROM user_tables WHERE table_name = 'XYZ'. if record found then truncate table otherwise create Table. Work like Create or Replace. answered Dec 24, 2013 at 6:22. Pradip Gavali.
