I am new to oracle. I would like to ask if there exist one single command that could copy table a to table b such that table b would have the same data, same structure and same access priviledge as table a? I would like to make a duplicate of a table which contain the same behavior.
Someone please correct me if I am wrong, but I don't think you can copy it with privileges/indexes as it is. That might be becasuse you need to give a new name for the index,primary key etc, and the database will not know what name needs to be given to these. So you can do this.
Run this to get the DDL of the table you want and then replace it with new table name. (my source table is TZ_TEST and I will create TZ_TEST_NEW. (Thanks to this answer for get_ddl command)
select replace(
(SELECT dbms_metadata.get_ddl( 'TABLE', 'TZ_TEST' ) FROM DUAL),
'TZ_TEST',
'TZ_TEST_NEW')
from dual
Execute the DDL
Use this to get grant permissions
select replace(
(select DBMS_METADATA.GET_DEPENDENT_DDL('OBJECT_GRANT','TZ_TEST') FROM DUAL),
'TZ_TEST',
'TZ_TEST_NEW') from dual
Similarly use DBMS_METADATA to get constraints/index etc. Execute these statmetns.
Insert data
insert into TZ_TEST_NEW
select * from TZ_TEST
Please remember that if you have an auto generated primary key, then while inserting data, you need to exclude that column from insert and select statments.
Anyone please feel free to add if I missed something.
Also we can create a procedure which can so all this but you need to be careful with all the steps. So once you do it couple of times and it works, we can create a procedure for it.
If you are using TOAD for Oracle, then select the table name and press F4. Then select script tab in the describe window.
This will generate the table script. You just need to use Search/Replace to change the table name and execute the script.
The newly created table will contain the same behavior.
I would do it in two steps:
Use CTAS i.e. create table as select .. to first create a copy of the table with new name with the data. You could also use PARALLEL and NOLOGGING feature to increase the performance.
For example,
create table t parallel 4 nologging as select * from emp;
Get the associated structures like indexes, constraints etc. using DBMS_METADATA.GET_DEPENDENT_DDL and execute it. But, you need to first replace the table_name to your new table_name as you have created in step 1.
CTAS would be much faster than traditional insert.
I want to write a procedure in SQL anywhere which can check if a local temporary table exists and if it does use it. I do not want to drop the table. I have already found a way to drop local temporary table which is:
DROP TABLE IF EXISTS t;
I have also tried following:
I created a local temporary table TEMP_TABLE. Then I tried to run this query:
select object_id('tempdb..TEMP_TABLE')
This just gives me NULL. But if I try
select * from TEMP_TABLE
it works perfectly fine.
So can anyone please help me find a way to check if the local temporary table exists in sql anywhere.
I'm not sure what version of Sybase you have but this works in Sybase 11 so I can imagine it will work in any version up too:
Begin
Create local Temporary table TEMP_TABLE (column1 int); //Create temp table
// any other code needed to be executed if table did not exist
Exception when others then
// Code to be executed when table does exist
end;
This is basically a try..catch for sybase. If the Temp Table exists it will throw an exception, in the exception you can run the code you want to knowing that the table already exists.
In one query you are referring database and in other you are not, try below two queries.
select object_id('tempdb..TEMP_TABLE')
select * from tempdb..TEMP_TABLE
select object_id('TEMP_TABLE')
select * from TEMP_TABLE
I need to insert records into a new table from an existing table. I used the following query to do this:
Insert into Newtable
Select * from Oldtable where date1 = #date
This query works most of the time, but in one scenario I get 10 million records to be inserted for the date1 value. In this case I'm getting the following error message:
Error : The transaction log for database "tempDB" is full. To find out why space in the log cannot be reused, see the log_reuse_wait_desc column in sys.databases
Should I break the query into parts and insert them sequentially, or is there a way to do this with the current query?
This is, perhaps, a distasteful suggestion. But, you can try exporting the data to a file and then inserting using bulk-insert, with database logging set to SIMPLE or BULK-LOGGED.
More information is at http://msdn.microsoft.com/en-us/library/ms190422.aspx.
I'm having this odd problem since yesterday. I've tried several options and I actually reinstalled ORACLE and the DB itself.
Here's the problem: I have this table that is somekind of zombie. Here are the symptoms:
SELECT TABLE_NAME FROM USER_TABLES WHERE TABLE_NAME='MYTABLE'
Returns a record, meaning that the table exists.
SELECT COLUMN_NAME FROM USER_TAB_COLUMNS WHERE TABLE_NAME = 'MYTABLE'
Returns all the columns of MYTABLE. So far so good, the table exists.
SELECT * FROM MYTABLE
Returns ORA-00942: table or view does not exist.
At this point I'm quite confused: the table seems to exist on the USERTABLES but I cannot SELECT over it?
CREATE TABLE MYTABLE (Foo NUMBER) TABLESPACE MYTABLESPACE
Returns:
ORA-00604: error occurred at recursive SQL level 1
ORA-00001: unique constraint (SYS.I_OBJ2) violated
I do not understand this error. But the best is yet to come.
SELECT * FROM MYTABLE
Surprisingly, the above query (an exact copy of the 3rd query) returns several records now!
Moreover, I noticed that the column Foo is not present: the table I now see is my initial table that had other columns.
DROP TABLE MYTABLE
I now try to drop the table and I get the following errors:
ORA-00604: error occurred at recursive SQL level 1
ORA-00942: table or view does not exist
ORA-06512: at line 19
SELECT * FROM MYTABLE
More confused than ever, I try the above query and, surprise surprise, the table no longer exists.
I don't undestand this: the table is on USERTABLES but I cannot SELECT over it, however, if I create a new table with the same name, I get an error but now I can SELECT over the previous version of that table with several records.
Any thoughts ? I really need your help :(
EDIT - I checked now: I'm unable to drop ANY table. This might just be a new symptom.
Solution
The problem was that MDSYS.SDO_GEOR_SYSDATA_TABLE table was missing and a drop event trigger was trying to access it, generating the error. The solution was restoring that table.
If have privileges, try this query:
SELECT *
FROM dba_objects
WHERE object_name = 'MYTABLE';
And see what objects exist with that name. It might point you in the right direction.
You didn't qualify the schema names when trying to select and drop. The CURRENT_SCHEMA of your session may be different form the log-on user. Check by trying
select SYS_CONTEXT('USERENV', 'CURRENT_SCHEMA') from dual;
Instead of describing what the output was, could you please copy/paste the complete output for us?
Lastly, can you exclude that someone messed up the dictionary? You know, SYSDBA can do anything....
I know the statement:
create table xyz_new as select * from xyz;
Which copies the structure and the data, but what if I just want the structure?
Just use a where clause that won't select any rows:
create table xyz_new as select * from xyz where 1=0;
Limitations
The following things will not be copied to the new table:
sequences
triggers
indexes
some constraints may not be copied
materialized view logs
This also does not handle partitions
I used the method that you accepted a lot, but as someone pointed out it doesn't duplicate constraints (except for NOT NULL, I think).
A more advanced method if you want to duplicate the full structure is:
SET LONG 5000
SELECT dbms_metadata.get_ddl( 'TABLE', 'MY_TABLE_NAME' ) FROM DUAL;
This will give you the full create statement text which you can modify as you wish for creating the new table. You would have to change the names of the table and all constraints of course.
(You could also do this in older versions using EXP/IMP, but it's much easier now.)
Edited to add
If the table you are after is in a different schema:
SELECT dbms_metadata.get_ddl( 'TABLE', 'MY_TABLE_NAME', 'OTHER_SCHEMA_NAME' ) FROM DUAL;
create table xyz_new as select * from xyz where rownum = -1;
To avoid iterate again and again and insert nothing based on the condition where 1=2
Using sql developer select the table and click on the DDL tab
You can use that code to create a new table with no data when you run it in a sql worksheet
sqldeveloper is a free to use app from oracle.
If the table has sequences or triggers the ddl will sometimes generate those for you too. You just have to be careful what order you make them in and know when to turn the triggers on or off.
You can do this
Create table New_table as select * from Old_table where 1=2 ;
but be careful
The table you create does not have any Index, PK and so on like the old_table.
DECLARE
l_ddl VARCHAR2 (32767);
BEGIN
l_ddl := REPLACE (
REPLACE (
DBMS_LOB.SUBSTR (DBMS_METADATA.get_ddl ('TABLE', 'ACTIVITY_LOG', 'OLDSCHEMA'))
, q'["OLDSCHEMA"]'
, q'["NEWSCHEMA"]'
)
, q'["OLDTABLSPACE"]'
, q'["NEWTABLESPACE"]'
);
EXECUTE IMMEDIATE l_ddl;
END;
Simply write a query like:
create table new_table as select * from old_table where 1=2;
where new_table is the name of the new table that you want to create and old_table is the name of the existing table whose structure you want to copy, this will copy only structure.
SELECT * INTO newtable
FROM oldtable
WHERE 1 = 0;
Create a new, empty table using the schema of another. Just add a WHERE clause that causes the query to return no data:
WHERE 1 = 0 or similar false conditions work, but I dislike how they look. Marginally cleaner code for Oracle 12c+ IMHO is
CREATE TABLE bar AS
SELECT *
FROM foo
FETCH FIRST 0 ROWS ONLY;
Same limitations apply: only column definitions and their nullability are copied into a new table.
If one needs to create a table (with an empty structure) just to EXCHANGE PARTITION, it is best to use the "..FOR EXCHANGE.." clause. It's available only from Oracle version 12.2 onwards though.
CREATE TABLE t1_temp FOR EXCHANGE WITH TABLE t1;
This addresses 'ORA-14097' during the 'exchange partition' seamlessly if table structures are not exactly copied by normal CTAS operation. I have seen Oracle missing some of the "DEFAULT" column and "HIDDEN" columns definitions from the original table.
ORA-14097: column type or size mismatch in ALTER TABLE EXCHANGE
PARTITION
See this for further read...
you can also do a
create table abc_new as select * from abc;
then truncate the table abc_new. Hope this will suffice your requirement.
Using pl/sql developer you can right click on the table_name either in the sql workspace or in the object explorer, than click on "view" and than click "view sql" which generates the sql script to create the table along with all the constraints, indexes, partitions etc..
Next you run the script using the new_table_name
copy without table data
create table <target_table> as select * from <source_table> where 1=2;
copy with table data
create table <target_table> as select * from <source_table>;
In other way you can get ddl of table creation from command listed below, and execute the creation.
SELECT DBMS_METADATA.GET_DDL('TYPE','OBJECT_NAME','DATA_BASE_USER') TEXT FROM DUAL
TYPE is TABLE,PROCEDURE etc.
With this command you can get majority of ddl from database objects.
Create table target_table
As
Select *
from source_table
where 1=2;
Source_table is the table u wanna copy the structure of.
create table xyz_new as select * from xyz;
-- This will create table and copy all data.
delete from xyz_new;
-- This will have same table structure but all data copied will be deleted.
If you want to overcome the limitations specified by answer:
How can I create a copy of an Oracle table without copying the data?
The task above can be completed in two simple steps.
STEP 1:
CREATE table new_table_name AS(Select * from old_table_name);
The query above creates a duplicate of a table (with contents as well).
To get the structure, delete the contents of the table using.
STEP 2:
DELETE * FROM new_table_name.
Hope this solves your problem. And thanks to the earlier posts. Gave me a lot of insight.