This question already has answers here:
SELECT INTO in MySQL
(2 answers)
Closed 5 years ago.
I'm trying to move a select statement's result into a new non-existent table but not able to figure how.
In MS SQL, I would be following the below,
SELECT * INTO <NON_EXISTING_TABLE> FROM
(
SELECT * FROM TABLE1 A
JOIN TABLE2 B
ON A.DescriptionNo = B.DescriptionNo
WHERE A.DescriptionNo =1) A
When i quickly looked it up , I can see only answers to insert data into an existing table but not dynamically create a new table with the result of the statement.
Please advice !
If you want to create a new table from a select, you can use this syntax:
create table new_table as
select *
from existing_table
where ...
This solution showed above works perfect also for selected rows. For example I am creating demonstration rows for my nice2work project, and this works perfect.
CREATE TEMPORARY TABLE tmptable SELECT * FROM myTable WHERE id=500;
UPDATE tmptable SET id = 0;
UPDATE some fields I need to change
INSERT INTO myTable SELECT * FROM tmptable;
DROP TABLE tmptable;
// You can use this same also directly into your code like (PHP Style)
$sql = "CREATE TEMPORARY TABLE tmptable SELECT * FROM myTable WHERE id=500;
UPDATE tmptable SET id = 0;
UPDATE some fields I need to change
INSERT INTO myTable SELECT * FROM tmptable;DROP TABLE tmptable;";
I'm trying to remove duplicates from a table where FieldA,FieldB and FieldC are identical. I want to keep the record where FieldD is NOT NULL.
I generally remove duplicates (and prevent future ones) like so:
CREATE TABLE newtable LIKE oldtable;
INSERT newtable SELECT * FROM oldtable group by FieldA,FieldB,FieldC;
Drop Table oldtable;
Alter Table newtable RENAME oldtable;
CREATE Unique INDEX UniqueIndex ON oldtable (FieldA,FieldB,FieldC)
However I am unclear how to modify this to include the Not Null FieldD. It occurs to me I could use a Max(Char_Length(FieldD) but that simply seems to return the max value for each group, not the record with the max valule
For now I did the following though not (IMHO) a perfect solution
Update Table1 as T1
Inner Join Table1 as T2
On T1.FieldA=T2.FieldA
And T1.FieldB=T2.FieldB
And T1.Field=T2.FieldC
Set T1.FieldD=T2.FieldD
Where T1.FieldD is NULL and T2.FieldD is NOT NULL
This allowed me to standardize FieldD to a single non-null value and then I was able to easily remove dupes using the sequence I posted above:
CREATE TABLE newtable LIKE oldtable;
INSERT newtable SELECT * FROM oldtable group by FieldA,FieldB,FieldC;
Drop Table oldtable;
Alter Table newtable RENAME oldtable;
CREATE Unique INDEX UniqueIndex ON oldtable (FieldA,FieldB,FieldC)
In an ideal world I'd have figured out an update query to remove the dupes per the question but this intermediary step worked fine for now.
Leaving the question open and unsolved in case someone has a more direct solution to my question.
This question already has answers here:
Closed 10 years ago.
Possible Duplicate:
how to use if not exists while inserting a row mysql
I have problem:
I have table named "table" with 4 columns: id(int, PK, AI, Unique), col1(varchar), col2(varchar), col3(datetime)
Many users can connect to mysql server and insert rows into "table". The problem is that col2 and col3 can't exists in other row in "table".
I would write something like that:
IF NOT EXISTS (select * from table where col2='2' and col3='2012-12-12 12:12:12') INSERT INTO table(col1, col2, col3) values(1,2,'2012-12-12 12:12:12')
I assume you know what I'm trying to do.
I'm trying to do this in one statement (to avoid situation in which 2 users inserts the same row at the same time) or in transaction. If I should do it in transaction, then what type of isolation should it be? Serializable isolation causes lock tables so it can slow down inserting process much more.
Help me, please.
If you don't want duplicates for the pair of col2 and col3 (i.e. col 2 can have duplicates but any pair of col2 and col3 only appears once) you can specify this:
UNIQUE(col2,col3)
Any query which now attempts to insert a col2,col3 pair will fail. You can deal with this either using:
INSERT IGNORE INTO table(col1, col2, col3) values(1,2,'2012-12-12 12:12:12');
or if the insert should change the values you can use:
INSERT INTO table(col1, col2, col3) values(1,2,'2012-12-12 12:12:12')
ON DUPLICATE KEY UPDATE someCol=someVal
Is there a way to use a MySQL INSERT similar to the following:
INSERT INTO doc_details SELECT * FROM doc_details WHERE dd_id = 1
This doesn't work because the primary key is being repeated and it can get very long-winded expanding the columns out.
The purpose of this is to duplicate rows in the same table which will get modified later, retrieving the last_insert_id for the new record. So ideas for other ways to do this would be appreciated too.
Thanks.
Simply name the columns you want to duplicate and omit the primary key:
INSERT INTO doc_details (col1, col2, col3)
SELECT col1, col2, col3
FROM doc_details
WHERE dd_id = 1
I'd suggest you to make ID field with AUTO_INCREMENT option, then use NULL values when inserting -
INSERT INTO doc_details(id, column1, column2)
SELECT NULL, column1, column2 FROM doc_details WHERE dd_id = 1;
In this case old ID will be changed with new ones.
You can depend on temporary table to copy from old record and omitting the key field value.
You have to use at least one named column, i.e. the key field name, to omit its repeating values.
See the following example:
CREATE TEMPORARY TABLE tmp SELECT * from doc_details WHERE dd_id = ?;
ALTER TABLE tmp drop pk_field_name_here; -- drop the key field for not repeating
INSERT INTO doc_details SELECT 0, tmp.* FROM tmp;
DROP TABLE tmp;
You can observe that no other filed names are used but the key field name to omit it's value.
You can also refer to my answer to a similar posting at: Mysql: Copy row but with new id.
Thanks for the answers. Really appreciated. Because most answers specify the column, this led to some extra research that said 'wildcards cannot be used in INSERT statements. Select, Modify and insert into the same table
I managed to solve this in my application with a separate SELECT then the INSERT with the columns expanded with a Perl map function:
SELECT * FROM doc_details WHERE dd_id = 1
Then in Perl, with the row as a hash reference in $data:
$data->{'dd_id'} = 0;$columns = join(',', map {$_ .'='. $dbh->quote( $data->{$_} ) } keys %{$cdh} );
Does the trick nicely - it copies the row regardless of changes to the column structure/order as long as the auto_increment column is maintained.
I know it's not a pure SQL solution - although Ravinder provided one that was.
Thanks to all!
In MySQL I am trying to copy a row with an autoincrement column ID=1 and insert the data into same table as a new row with column ID=2.
How can I do this in a single query?
Use INSERT ... SELECT:
insert into your_table (c1, c2, ...)
select c1, c2, ...
from your_table
where id = 1
where c1, c2, ... are all the columns except id. If you want to explicitly insert with an id of 2 then include that in your INSERT column list and your SELECT:
insert into your_table (id, c1, c2, ...)
select 2, c1, c2, ...
from your_table
where id = 1
You'll have to take care of a possible duplicate id of 2 in the second case of course.
IMO, the best seems to use sql statements only to copy that row, while at the same time only referencing the columns you must and want to change.
CREATE TEMPORARY TABLE temp_table ENGINE=MEMORY
SELECT * FROM your_table WHERE id=1;
UPDATE temp_table SET id=0; /* Update other values at will. */
INSERT INTO your_table SELECT * FROM temp_table;
DROP TABLE temp_table;
See also av8n.com - How to Clone an SQL Record
Benefits:
The SQL statements 2 mention only the fields that need to be changed during the cloning process. They do not know about – or care about – other fields. The other fields just go along for the ride, unchanged. This makes the SQL statements easier to write, easier to read, easier to maintain, and more extensible.
Only ordinary MySQL statements are used. No other tools or programming languages are required.
A fully-correct record is inserted in your_table in one atomic operation.
Say the table is user(id, user_name, user_email).
You can use this query:
INSERT INTO user (SELECT NULL,user_name, user_email FROM user WHERE id = 1)
This helped and it supports a BLOB/TEXT columns.
CREATE TEMPORARY TABLE temp_table
AS
SELECT * FROM source_table WHERE id=2;
UPDATE temp_table SET id=NULL WHERE id=2;
INSERT INTO source_table SELECT * FROM temp_table;
DROP TEMPORARY TABLE temp_table;
USE source_table;
For a quick, clean solution that doesn't require you to name columns, you can use a prepared statement as described here:
https://stackoverflow.com/a/23964285/292677
If you need a complex solution so you can do this often, you can use this procedure:
DELIMITER $$
CREATE PROCEDURE `duplicateRows`(_schemaName text, _tableName text, _whereClause text, _omitColumns text)
SQL SECURITY INVOKER
BEGIN
SELECT IF(TRIM(_omitColumns) <> '', CONCAT('id', ',', TRIM(_omitColumns)), 'id') INTO #omitColumns;
SELECT GROUP_CONCAT(COLUMN_NAME) FROM information_schema.columns
WHERE table_schema = _schemaName AND table_name = _tableName AND FIND_IN_SET(COLUMN_NAME,#omitColumns) = 0 ORDER BY ORDINAL_POSITION INTO #columns;
SET #sql = CONCAT('INSERT INTO ', _tableName, '(', #columns, ')',
'SELECT ', #columns,
' FROM ', _schemaName, '.', _tableName, ' ', _whereClause);
PREPARE stmt1 FROM #sql;
EXECUTE stmt1;
END
You can run it with:
CALL duplicateRows('database', 'table', 'WHERE condition = optional', 'omit_columns_optional');
Examples
duplicateRows('acl', 'users', 'WHERE id = 200'); -- will duplicate the row for the user with id 200
duplicateRows('acl', 'users', 'WHERE id = 200', 'created_ts'); -- same as above but will not copy the created_ts column value
duplicateRows('acl', 'users', 'WHERE id = 200', 'created_ts,updated_ts'); -- same as above but also omits the updated_ts column
duplicateRows('acl', 'users'); -- will duplicate all records in the table
DISCLAIMER: This solution is only for someone who will be repeatedly duplicating rows in many tables, often. It could be dangerous in the hands of a rogue user.
If you're able to use MySQL Workbench, you can do this by right-clicking the row and selecting 'Copy row', and then right-clicking the empty row and selecting 'Paste row', and then changing the ID, and then clicking 'Apply'.
Copy the row:
Paste the copied row into the blank row:
Change the ID:
Apply:
insert into MyTable(field1, field2, id_backup)
select field1, field2, uniqueId from MyTable where uniqueId = #Id;
A lot of great answers here. Below is a sample of the stored procedure that I wrote to accomplish this task for a Web App that I am developing:
-- SET NOCOUNT ON added to prevent extra result sets from
-- interfering with SELECT statements.
SET NOCOUNT ON
-- Create Temporary Table
SELECT * INTO #tempTable FROM <YourTable> WHERE Id = Id
--To trigger the auto increment
UPDATE #tempTable SET Id = NULL
--Update new data row in #tempTable here!
--Insert duplicate row with modified data back into your table
INSERT INTO <YourTable> SELECT * FROM #tempTable
-- Drop Temporary Table
DROP TABLE #tempTable
You can also pass in '0' as the value for the column to auto-increment, the correct value will be used when the record is created. This is so much easier than temporary tables.
Source:
Copying rows in MySQL
(see the second comment, by TRiG, to the first solution, by Lore)
I tend to use a variation of what mu is too short posted:
INSERT INTO something_log
SELECT NULL, s.*
FROM something AS s
WHERE s.id = 1;
As long as the tables have identical fields (excepting the auto increment on the log table), then this works nicely.
Since I use stored procedures whenever possible (to make life easier on other programmers who aren't too familiar with databases), this solves the problem of having to go back and update procedures every time you add a new field to a table.
It also ensures that if you add new fields to a table they will start appearing in the log table immediately without having to update your database queries (unless of course you have some that set a field explicitly)
Warning: You will want to make sure to add any new fields to both tables at the same time so that the field order stays the same... otherwise you will start getting odd bugs. If you are the only one that writes database interfaces AND you are very careful then this works nicely. Otherwise, stick to naming all of your fields.
Note: On second thought, unless you are working on a solo project that you are sure won't have others working on it stick to listing all field names explicitly and update your log statements as your schema changes. This shortcut probably is not worth the long term headache it can cause... especially on a production system.
INSERT INTO `dbMyDataBase`.`tblMyTable`
(
`IdAutoincrement`,
`Column2`,
`Column3`,
`Column4`
)
SELECT
NULL,
`Column2`,
`Column3`,
'CustomValue' AS Column4
FROM `dbMyDataBase`.`tblMyTable`
WHERE `tblMyTable`.`Column2` = 'UniqueValueOfTheKey'
;
/* mySQL 5.6 */
Try this:
INSERT INTO test_table (SELECT null,txt FROM test_table)
Every time you run this query, This will insert all the rows again with new ids. values in your table and will increase exponentially.
I used a table with two columns i.e id and txt and id is auto increment.
I was looking for the same feature but I don't use MySQL. I wanted to copy ALL the fields except of course the primary key (id). This was a one shot query, not to be used in any script or code.
I found my way around with PL/SQL but I'm sure any other SQL IDE would do. I did a basic
SELECT *
FROM mytable
WHERE id=42;
Then export it to a SQL file where I could find the
INSERT INTO table (col1, col2, col3, ... , col42)
VALUES (1, 2, 3, ..., 42);
I just edited it and used it :
INSERT INTO table (col1, col2, col3, ... , col42)
VALUES (mysequence.nextval, 2, 3, ..., 42);
insert into your_table(col1,col2,col3) select col1+1,col2,col3 from your_table where col1=1;
Note:make sure that after increment the new value of col1 is not duplicate entry if col1 is primary key.
CREATE TEMPORARY TABLE IF NOT EXISTS `temp_table` LIKE source_table;
DELETE FROM `purchasing2` ;
INSERT INTO temp_table SELECT * FROM source_table where columnid = 2;
ALTER TABLE temp_table MODIFY id INT NOT NULL;
ALTER TABLE temp_table DROP PRIMARY KEY;
UPDATE temp_table SET id=NULL ;
INSERT INTO source_table SELECT * FROM temp_table;
DROP TEMPORARY TABLE IF EXISTS temp_table ;
Dump the row you want to sql and then use the generated SQL, less the ID column to import it back in.