In MySQL, can I copy one row to insert into the same table?

Question

insert into table select * from table where primarykey=1

I just want to copy one row to insert into the same table (i.e., I want to duplicate an ex

Answer 1

If your table's primary key field is an auto increment field, then you can use query with columns. For example, your table named test_tbl has 3 fields as id, name, age. id is a primary key field and auto increment, so you can use the following query to duplicate the row:

INSERT INTO `test_tbl` (`name`,`age`) SELECT `name`,`age` FROM `test_tbl`;

This query results in duplicating every row.

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If your table's primary key field is not an auto increment field, then you can use the following method:

INSERT INTO `test_tbl` (`id`,`name`,`age`)
  SELECT 20,`name`,`age` FROM `test_tbl` WHERE id = 19;

The result of this query is a duplicate row of id=19 inserted as id=20.