Sometimes if I want to quickly copy records from one table to another (that has the same structure) I use a query like this:
INSERT INTO table2 SELECT * FROM
table1 WHERE id = SOME_VALUE
How can I add a ON DUPLICATE KEY UPDATE to this statement? I tried this:
INSERT INTO SELECT * FROM table1 WHERE
id = 1 ON DUPLICATE KEY UPDATE SELECT
* FROM table1 WHERE id = 1
But I get an error. Is there away to accomplish the query above with out individually listing each column in the query?
P.S. Yes, I realize that it is not good practice to have multiple tables with identical structures, but sometimes you just don't get control over everything in the workplace!
The below UPDATES if there is no PK duplication and INSERTs is there is:
REPLACE INTO table2(field1, field2, field3)
SELECT field1, field2,field3 FROM table1
WHERE id=1;
http://dev.mysql.com/doc/refman/5.0/en/insert-on-duplicate.html Just use the SELECT field_name from the other table like in dnagirls example
Related
How it's possible to copy one entry row of a table with same data to another (same ID, same data values) Database -> same table?
Example:
Table Units:
UID Department Name Item
67 HR John Doe Table
If both tables equal no. of columns and in same order you want to insert then just use below simple query-
INSERT INTO mytable SELECT * FROM units WHERE uid=67;
If you want to insert selected column in another table's selected columns and in your order then use below-
INSERT INTO mytable(col1,col2,col3,col4) SELECT uid,department,`name`,item FROM units WHERE uid=67;
If I understand you correctly you want to copy some rows to table of another DB.
Try INSERT SELECT Query:
insert into db1.tbl(id,col1,col2)
select id,col1,col2 from db2.tbl;
Use trigger option in mysql to make new table with same data.
Suppose if you want to copy table1 data to table2 with some condition.
INSERT INTO table2 (ID, NAME) SELECT Col1, Col2 FROM table1 WHERE Col1='<Your_Condition>';
Here table2 have fields like ID and NAME and table1 have fields like Col1 and Col2.
In that case, above query copy table1 data to table2 on these fields where condition matched on table1, if you want to copy whole data of table1 then remove the WHERE condition from Select Query.
Given the following table structure:
ID
Field1
Field2
Field3
I would like to duplicate a record in the table. The pseudo code would look something like this:
DUPLICATE * IN MyTable WHERE ID = 3
Here are my constraints:
I don't want the ID duplicated.
I do not now how many fields or their types are in the table.
I do not want to do this in PHP.
You can use a select statement to insert rows. If you want to insert a new row with all of the same values, just write a select statement to get the values you want. Try something like this:
INSERT INTO myTable (field1, field2, field3)
SELECT field1, field2, field3 FROM myTable WHERE id = 3;
Here is an SQL Fiddle example.
EDIT
If you don't know how many fields, an option you have is to use a temporary table. See this article for example. The reason you need a temporary table, is because you cannot simply re-insert the row, because you will have a duplicate key error. So the logic will be as follows: Add row to new table, change the id, insert duplicated row with new id into old table, and drop the temporary table.
Assuming your id column is auto_increment, you can set the new id to the current maximum id + 1. You don't have to do that, but as long as you have some way of updating the id to something that does not already exist, this will work. Try this instead:
CREATE TEMPORARY TABLE temp SELECT * FROM myTable WHERE id = 3;
UPDATE temp SET id = (SELECT MAX(id) FROM myTable) + 1;
INSERT INTO myTable SELECT * FROM temp;
DROP TABLE temp;
Here is another SQL Fiddle example.
I am trying to populate a products table on MySQL with latest products, which are retrieved and stored in products_temp table.
So the method for this is straight forward, simply doing an INSERT to products from products_temp, as such:
INSERT INTO products ( select products_temp.* FROM products_temp )
Problem is, it results in a duplicate primary key error, because of the id from products_temp clashing with the id in products.
Can someone tell me how to fix this please?
I tried declaring the fields in the select statement without the id, but that results in "Column count doesn't match value count at row 1"
Any help would be appreciated.
Thanks!
You'll need to declare the columns except the ID on both the INSERT and the SELECT, since the number of fields need to match, and id (as you noticed) can't be inserted as is into the destination table.
INSERT INTO DestTable (field1, field2, field3)
SELECT field1, field2, field3 FROM SourceTable;
An SQLfiddle to test with.
EDIT: You could do it in a bit more hacky way to simplify the insert. You can create a trigger that simply forces the primary key to NULL on insert.
CREATE TRIGGER t_DT BEFORE INSERT ON DestTable
FOR EACH ROW
SET NEW.id = NULL;
then a copy from table to table can be done as simply;
INSERT INTO DestTable SELECT * FROM SourceTable;
Another SQLfiddle.
How about something like:
INSERT INTO products
(
select products_temp.* FROM products_temp
where key not in (select key from products)
)
I'm looking for a way I can duplicate all the rows in my database, I tried exporting it and then importing but I get the duplicate key error.
The reason is purely for testing purposes, I just want a load of dummy data in there to test the system I have out.
Is there a direct statement for this? Or is there a way to export all data except ID (or change ID to MAX(ID) + 1 or AUTO INCREMENT)?
You can try this:
INSERT INTO your_table_name(parent_id,priority,text,shortname,weighting,g_or_a,
dept,ksf,day_start,day_end,date_start,date_end,depends_on,is_question,budget,
ccode,responsible,accountable,consulted,informed)
(SELECT parent_id,priority,text,shortname,weighting,g_or_a,dept,ksf,
day_start,day_end,date_start,date_end,depends_on,is_question,budget,ccode,
responsible,accountable,consulted,informed FROM your_table_name);
Firstly, insert one row in the table 'your_table_name'. Replace your_table_name with the actual table name in above code & execute the code repeatedly until it satisfies the required row numbers. I think it should work.
Put 1 record and then run:
insert into mytable select * from mytable
10 times. This will give you 1024 records. Continue until satisfied.
You could use an INSERT and the values would be a SELECT, just don't select the primary key and don't define it in the insert fields.
Imagine a table with 3 fields, the_pk, field_1, field_2
Something like
INSERT INTO the_table(field_1, field_2) (SELECT field_1, field_2 FROM the_table)
I have a table that contains some duplicate redords. I want to make records unique. I created a new table (say, destination) and I specified a unique column in it. How can copy records from table1 (source) such that, if the record inserted in the destination table, it does not insert it again.
You can use the "select into" construct and select insert only distinct rows, like this:
insert into table_without_dupes (column0, column1) select distinct column0, column1 from table_with_dupes
If you have autoincrement or other columns that makes the rows distinct, you can just leave them out of the insert and select parts of the statement.
Edit:
If you want to detect duplicates by a single column, you can use group by:
insert into table_without_dupes (column0, column1) select column0, column1 from table_with_dupes group by column0
MySQL will allow you to refer non-aggregated columns in select, but remember that the documentation says "The server is free to choose any value from each group", if you want to select one specific row of the groups, you might find this example useful.
Generic approach
insert into destination(col1,col2)
select DISTINCT col1,col2 from source as s where not exists
(select * from destination as d where d.col1=s.col1)
Edited
insert into destination(col1,col2)
SELECT distinct col1,col2 from source
Edited (Assuming col3 is duplicated and you want only one copy of it.)
insert into destination(col1,col2,col3,....,colN)
SELECT col1,col2,col3,...,colN from source as s1 inner join
(
select col1,col2,max(col3) as col3
from source
group by col1,col2
) as s2 on t1.col1=t2.col1 and t1.col2=t2.col2 and t1.col3=t2.col3
insert into <dest_table_name>
select distinct * from <source_table_name>;