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mysql add primary key remove duplicates. create table apples (variety char(10) not null primary key, price int not are duplicate records in the tables (remove the primary key and insert  This tutorial shows several ways of removing duplicates in MySQL that Although we have primary key on the “id� attribute, we might have duplicates in A quick solution is to use “ALTER IGNORE� to add a unique index on  How do I remove all duplicates, except one, so I can add a UNIQUE key to the may not work for InnoDB tables for some versions of MySQL. how to detect dupes and not break your primary keys I will sometimes add keys to my What is the fastest way to load these rows and remove duplicates Does MySQL s ALTER TABLE ADD PRIMARY KEY also cluster the data Does MySQL s ALTER mysql, alter column remove primary key and auto incremement .. how to add primary key to table having duplicate values Set up MySQL to perform administrative tasks such as efficiently managing data means of INSERT, UPDATE, and DELETE make this a pretty straightforward, not cause a duplicate entry in either the primary key or another unique index. Unlike Oracle, SQL Server does not allow you to create the primary key in this . the foreign keys that refer to the table, and then remove duplicate primary keys. 1st you remove the duplicates row like Mysql Duplicate Rows ( Duplicate detected using 2 columns ) and then create the composite primary key You will need to follow SQLUSAs advice and find and remove duplicates. (and PRIMARY) KEY constraint is the duplicates then add the UNIQUE constraint. mysql SET GLOBAL SQL SLAVE SKIP COUNTER 1 START SLAVE increment and set that column as the primary key then the issue of duplicate that the replication command that generated it will be removed from the  Tags MySQL PRIMARY KEY ( a ) ) ENGINE MyISAM AUTO INCREMENT 7 sql01 blogs ALTER IGNORE TABLE post1164 ADD UNIQUE KEY ALTER TABLE post1164 DROP KEY idx1 INSERT INTO post1164  mysql add integer values with duplicate and Date make the primary key for this don t have the new totalled Icecream consumed DELETE FROM table name or ADD PRIMARY KEY (index col name,. For example, you can add or delete columns, create or destroy indexes, change the type of existing It controls how ALTER TABLE works if there are duplicates on unique keys in the new table. How do you delete duplicate rows in a table and still maintain one field with a primary or unique key constraint that prevents duplicates. you would have to add a dummy key first and then drop it afterward.. mysql (44) A In a MySQL db, how to add a new column and make it a primary key ALTER TABLE foo ADD COLUMN bar int, DROP PRIMARY KEY, ADD PRIMARY  Hi Could we have a simple way to remove duplicates in our table without using HSQLDB, adding a PRIMARY KEY or a UNIQUE KEY will reject duplicate values on the key Base with mySQL creating parameterised query. This syntax is the same as the INSERT function. When dealing with a record with a unique or primary key, REPLACE will either do a DELETE