How can I create clone copy of table without data? Because I just want to copy a definition of table not data.
I tried below but it is copying data as well
Select *
into Clone_Supplier
from Supplier
Copy all columns from selected table
Select Top 0 * into NewTable from OldTable
Copy some columns from selected table
Select Top 0 Col1,Col2 into NewTable from OldTable
Copy all(Data and Structure)
Select * into NewTable from OldTable
You could add WHERE 1=2 to get structure only:
Select *
into Clone_Supplier
from Supplier
where 1=2;
It won't be exact copy though:
no constraints
no indexes
no triggers
It is useful table to generate and new table
Select Top 0 * into tblNew from tblOld
Solution Query :
SELECT TOP 0 * INTO newTable1 FROM oldTable1;
You just need to add one false condition. So that it wont return any data and you will create clone copy of table without data. you can use below query
Select * into Clone_Supplier from Supplier WHERE 1=2
Create Table new_table LIKE old_table
Will create an empty copy of original table with original attributes etc.
Related
We use copy command to copy data of one table to a file outside database.
Is it possible to copy data of one table to another table using command.
If yes can anyone please share the query.
Or is there any better approach like we can use pg_dump or something like that.
You cannot easily do that, but there's also no need to do so.
CREATE TABLE mycopy AS
SELECT * FROM mytable;
or
CREATE TABLE mycopy (LIKE mytable INCLUDING ALL);
INSERT INTO mycopy
SELECT * FROM mytable;
If you need to select only some columns or reorder them, you can do this:
INSERT INTO mycopy(colA, colB)
SELECT col1, col2 FROM mytable;
You can also do a selective pg_dump and restore of just the target table.
If the columns are the same (names and datatypes) in both tables then you can use the following
INSERT INTO receivingtable (SELECT * FROM sourcetable WHERE column1='parameter' AND column2='anotherparameter');
Suppose there is already a table and you want to copy all records from this table to another table which is not currently present in the database then following query will do this task for you:
SELECT * into public."NewTable" FROM public."ExistingTable";
I am paring down a database for a small project. I heard the most efficient way to get a table down to just 1000 rows was to copy those 1000 rows to a new table drop the old and rename the new.
Could someone let me know if this is right and roughly how to do it?
I know how to select top 1000 but not how to drop and create a table by using a temp table or the like.
INSERT INTO NEW_TABLE
SELECT TOP 1000 * FROM OLD_TABLE
DROP TABLE OLD_TABLE
You can run this to create your new table:
SELECT TOP 1000 * INTO NewTable FROM OldTable
USING SELECT INTO will create a new table. Drawbacks of this method are you lose your keys on your table.
Alternatively, if the table exists, use
INSERT INTO NewTable SELECT * FROM OldTable
However, if you have an Identity field, this won't work -- you'll need to specify the column names
INSERT INTO NewTable (Field1, Field2,...) SELECT Field1, Field2...
As you can see, it really depends on your situation.
To drop a table, it's pretty easy:
DROP TABLE OldTable
Good luck.
how to create a duplicate table with no data in it
old tablename--student
newtablename--student1
plz tell me the exat query
thanks,
Churchill..
SELECT TOP 0 * INTO student1 FROM student
select * into student1 from student where 1=0
First you can copy the whole table by:
select * into (your_table_name) from student
After copying the whole table, you delete the data by running:
truncate table (your_table_name);
create table student1 as select * from student;
In the above query student1 is the table which has the exact copy of the already existing table student which copies the entire data.
create table student1 as select * from student where 0=1;
The query copies only the columns present in the student table but no data will be copied
But please note, you can't copy the constraints and indexes
select *
into student1
from student
where 1=2
This will get you the columns,
but indexes and other objects
will require scripting
with a database tool of some sort.
create table newtable as select * from oldtable where clause
In Sql Server you can right click on the table name in the Object Explorer.
Select "Script Table as" > "CREATE To" and then select "New Query Editor Window"
This creates a query to create the table.
In this case table name [student] change this to [student1] in the query and run and you have an exact copy of the schema, indexes, vartypes, primary keys etc.
I am new to MySQL. I would like to copy the content of one table to another table within the same database. Basically, I would like to insert to a table from another table. Is there easy way of doing this?
If the tables have the same structure:
INSERT INTO TARGET_TABLE SELECT * FROM SOURCE_TABLE;
If the tables have different structures:
INSERT INTO TARGET_TABLE (`col1`,`col2`) SELECT `col1`,`col2` FROM SOURCE_TABLE;
You can also add conditions:
INSERT INTO TARGET_TABLE (`col1_`,`col2_`) SELECT `col1`,`col2` FROM SOURCE_TABLE WHERE `foo`=1
If the table doesn't exist, you can create one with the same schema like so:
CREATE TABLE table2 LIKE table1;
Then, to copy the data over:
INSERT INTO table2 SELECT * FROM table1
If table1 is large and you don't want to lock it for the duration of the copy process, you can do a dump-and-load instead:
CREATE TABLE table2 LIKE table1;
SELECT * INTO OUTFILE '/tmp/table1.txt' FROM table1;
LOAD DATA INFILE '/tmp/table1.txt' INTO TABLE table2;
This worked for me,
CREATE TABLE newtable LIKE oldtable;
Replicates newtable with old table
INSERT newtable SELECT * FROM oldtable;
Copies all the row data to new table.
If you want to create and copy the content in a single shot, just use the SELECT:
CREATE TABLE new_tbl SELECT * FROM orig_tbl;
This worked for me. You can make the SELECT statement more complex, with WHERE and LIMIT clauses.
First duplicate your large table (without the data), run the following query, and then truncate the larger table.
INSERT INTO table_small (SELECT * FROM table_large WHERE column = 'value' LIMIT 100)
Super simple. :-)
CREATE TABLE target_table SELECT * FROM source_table;
It just create a new table with same structure as of source table and also copy all rows from source_table into target_table.
CREATE TABLE target_table SELECT * FROM source_table WHERE condition;
If you need some rows to be copied into target_table, then apply a condition inside where clause
Try this. Works well in my Oracle 10g,
CREATE TABLE new_table
AS (SELECT * FROM old_table);
how to dynamically create a table with same columns as that of previous table. in sql
select * into new_table from table where 1 = 0
select * into new_table from table
Thats works in SQL2005
I believe that both of the above answers will work, but since you don't need the data and you just need the format, I would do the following:
select * into new_table from table
TRUNCATE new_table; -- I'm sure you know this, but just in case someone is new and doesn't, truncate leaves the table structure and removes all of the data.