Move SQL data from one table to another

Question

I was wondering if it is possible to move all rows of data from one table to another, that match a certain query?

For example, I need to move all table rows from Tab

Answer 1

Use this single sql statement which is safe no need of commit/rollback with multiple statements.

INSERT Table2 (
      username,password
) SELECT username,password
      FROM    (
           DELETE Table1
           OUTPUT
                   DELETED.username,
                   DELETED.password
           WHERE username = 'X' and password = 'X'
      ) AS RowsToMove ;

Works on SQL server make appropriate changes for MySql

Answer 2

It will create a table and copy all the data from old table to new table

SELECT * INTO event_log_temp FROM event_log

And you can clear the old table data.

DELETE FROM event_log

Answer 3

A cleaner representation of what some other answers have hinted at:

DELETE sourceTable
OUTPUT DELETED.*
INTO destTable (Comma, separated, list, of, columns)
WHERE <conditions (if any)>

Answer 4

You may use "Logical Partitioning" to switch data between tables:

By updating the Partition Column, data will be automatically moved to the other table:

here is the sample:

CREATE TABLE TBL_Part1
(id  INT NOT NULL,
 val VARCHAR(10) NULL,
 PartitionColumn  VARCHAR(10) CONSTRAINT CK_Part1 CHECK(PartitionColumn = 'TBL_Part1'),
 CONSTRAINT TBL_Part1_PK PRIMARY KEY(PartitionColumn, id)
);

CREATE TABLE TBL_Part2
(id  INT NOT NULL,
 val VARCHAR(10) NULL,
 PartitionColumn  VARCHAR(10) CONSTRAINT CK_Part2 CHECK(PartitionColumn = 'TBL_Part2'),
 CONSTRAINT TBL_Part2_PK  PRIMARY KEY(PartitionColumn, id)
);

GO

CREATE VIEW TBL(id, val, PartitionColumn)
WITH SCHEMABINDING
AS
     SELECT id, val, PartitionColumn FROM dbo.TBL_Part1
     UNION ALL  
     SELECT id, val, PartitionColumn FROM dbo.TBL_Part2;

GO

--Insert sample to TBL ( will be inserted to Part1 )
INSERT INTO TBL
VALUES(1, 'rec1', 'TBL_Part1');

INSERT INTO TBL
VALUES(2, 'rec2', 'TBL_Part1');

GO

--Query sub table to verify
SELECT * FROM TBL_Part1

GO
--move the data to table TBL_Part2 by Logical Partition switching technique
UPDATE TBL
  SET
      PartitionColumn = 'TBL_Part2';

GO

--Query sub table to verify
SELECT * FROM TBL_Part2

Answer 5

Here is how do it with single statement

WITH deleted_rows AS (
DELETE FROM source_table WHERE id = 1
RETURNING *
) 
INSERT INTO destination_table 
SELECT * FROM deleted_rows;

EXAMPLE:

    postgres=# select * from test1 ;
 id |  name
----+--------
  1 | yogesh
  2 | Raunak
  3 | Varun
(3 rows)


postgres=# select * from test2;
 id | name
----+------
(0 rows)


postgres=# WITH deleted_rows AS (
postgres(# DELETE FROM test1 WHERE id = 1
postgres(# RETURNING *
postgres(# )
postgres-# INSERT INTO test2
postgres-# SELECT * FROM deleted_rows;
INSERT 0 1


postgres=# select * from test2;
 id |  name
----+--------
  1 | yogesh
(1 row)

postgres=# select * from test1;
 id |  name
----+--------
  2 | Raunak
  3 | Varun

Answer 6

All these answers run the same query for the INSERT and DELETE. As mentioned previously, this risks the DELETE picking up records inserted between statements and could be slow if the query is complex (although clever engines "should" make the second call fast).

The correct way (assuming the INSERT is into a fresh table) is to do the DELETE against table1 using the key field of table2.

The delete should be:

DELETE FROM tbl_OldTableName WHERE id in (SELECT id FROM tbl_NewTableName)

Excuse my syntax, I'm jumping between engines but you get the idea.