It is very simple. whatever that update statement is attempting to do would leave the table in a state with duplicate entries (2 or more rows) in the primary key as seen in the output from show create table oxseo. that primary key may be on a single column, or it may be a composite (multi-column) key.. The statement above sets the value of the c1 to its current value specified by the expression values(c1) plus 1 if there is a duplicate in unique index or primary key. mysql insert on duplicate key update example. let’s take a look at an example of using the insert on duplicate key update to understand how it works.. #1062 - duplicate entry '2-s. name' for key 'primary' i really don't understand it. the primary key is on the first two columns (both of them), so the row i am trying to insert has a unique primary key, doesn't it? i tried to repair the table, i tried to optimize the table, all to no avail. also please note that i cannot change from myisam to.
Tour start here for a quick overview of the site help center detailed answers to any questions you might have meta discuss the workings and policies of this site. The on duplicate key update clause can contain multiple column assignments, separated by commas. in assignment value expressions in the on duplicate key update clause, you can use the values(col_name) function to refer to column values from the insert portion of the insert on duplicate key update statement.. Perhaps you can check out this question and answer: mysql replication: 'duplicated entry for primary key' 1 : skip all the duplicate key errors simply add this to my.cnf on the slave [mysqld] slave-skip-errors=1062 skip-slave-start and restart mysql..
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