SET clause, and preceded by the Group, Functions to Inspect and Set the Group Replication Communication See Practice #3. July 18, 2011 08:22AM Re: ON DUPLICATE KEY UPDATE - but ignore NULLs? Although you shouldn’t normally attempt to insert a record without first checking if the primary key you want to use has already been used, there may be times when this is required, such as when multiple developers need to update their own copies of a database, and a particular record may already exist in one or other of the databases. With ON DUPLICATE KEY UPDATE, the affected-rows value per row is 1 if the row is inserted as a new row, 2 if an existing row is updated, and 0 if an existing row is set to its current values. The write_record () function was returning error values even within INSERT IGNORE, because ignore_errors parameter of the fill_record_n_invoke_before_triggers () function call was always set to FALSE. MySQL INSERT IGNORE and STRICT mode When the strict mode is on, MySQL returns an error and aborts the INSERT statement if you try to insert invalid values into a table. row alias following the VALUES clause, even We build Web & Mobile Applications. Mike Cook. SELECT ON DUPLICATE KEY UPDATE statements for the the new row and columns is deprecated beginning with MySQL column aliases are not used, or if they are the same as the Replication”. In assignment value expressions in the ON DUPLICATE KEY clause on tables with multiple unique indexes. affected-rows value is 1 (not 0) if an existing row is set to Conditional duplicate key updates with MySQL. unsafe. Posted by: Mike Cook Date: July 18, 2011 08:22AM ... ON DUPLICATE KEY UPDATE - but ignore NULLs? INSERT portion of the Employing SET instead of So the solution is to mark INSERT..ON DUPLICATE KEY IGNORE unsafe. For loading huge amounts of data into MySQL, LOAD DATA INFILE is by far the fastest option. References to columns from a may be a derived table. source and the slave to diverge. When you do this, it is also necessary to declare the indexed columns to be NOT NULL, because a PRIMARY KEY does not … This will INSERT into table_name the specified values, but if the unique key already exists, it will update the other_field_1 to have a new value. function to refer to column values from the as shown here: The row alias must not be the same as the name of the table. You can also use row and column aliases with a Unfortunately, while this can be used in a way INSERT IGNORE or REPLACE works, ON DUPLICATE KEY UPDATE is not currently supported. mysql_real_connect() C API After some research, my options appear to be the use of either: ON DUPLICATE KEY UPDATE which implies an unnecessary update at some cost, or ; INSERT IGNORE which implies an invitation for other kinds of failure to slip in unannounced. It was introduced in MySQL 4.1 but I still constantly see people unaware of it. UNION are not supported. You can use a PRIMARY KEY or a UNIQUEIndex on a table with the appropriate fields to stop duplicate records. declared as UNIQUE and contains the value However, if you use the INSERT IGNORE statement, MySQL will issue a warning instead of an error. In other words, VALUES(col_name) in the ON DUPLICATE KEY UPDATE clause refers to the value of col_name. One side effect is that you if you do not make direct use of it in the assignment clause. After this fix such behaviour becomes legalized. Basically this query is when you want to change the data on result of a duplicate key. Such statements UPDATE clause, you can use the This means that an INSERT IGNORE statement which contains a duplicate value in a UNIQUE index or PRIMARY KEY field does not produce an error, but will instead simply ignore that particular INSERT command entirely. If a table contains an AUTO_INCREMENT column An error will occur when inserting a new record in MySQL if the primary key specified in the insert query already exists. Protocol Version, Condition Handling and OUT or INOUT Parameters, Component, Plugin, and User-Defined Function Statements, CREATE FUNCTION Statement for User-Defined Functions, DROP FUNCTION Statement for User-Defined Functions, SHOW REPLICAS | SHOW SLAVE HOSTS Statement, SHOW SLAVE HOSTS | SHOW REPLICAS Statement, 5.6  Not serious, but just interesting: MDEV-16925: INSERT IGNORE … ON DUPLICATE KEY UPDATE … allowed. acceptable forms of SELECT query expressions queries. The INSERT ON DUPLICATE KEY UPDATE is a MySQL’s extension to the SQL standard’s INSERT statement. How I plan to use this is as follows. returns the AUTO_INCREMENT value. It is not recommended to use this statement on tables with more than one unique index. the next few paragraphs of this section. VALUES() function is meaningful be written in the form shown here: If, in addition, you use the column aliases To work ON DUPLICATE with update of duplicated records, but MySQL manual lacks this information. the same row may be the same). try to avoid using an ON DUPLICATE KEY UPDATE ON DUPLICATE KEY UPDATE statement. UNION as a derived table: The technique of rewriting a query as a derived table also example, this statement produces an error: Instead, use an equivalent statement that rewrites the But the statement won't generate an error. they apply (that is, no column aliases referring to columns of References to columns in other tables, as long as the By default, MySQL provides the ON DUPLICATE KEY UPDATE option to INSERT, which accomplishes this task. When you insert a new row into a table if the row causes a duplicate in UNIQUE index or PRIMARY KEY, MySQL will issue an error. If you try to insert a duplicate row with a standard INSERT statement, you will encounter an error and the insert will fail. New Topic. Batch insert with ON DUPLICATE KEY. function when connecting to mysqld, the must qualify references to nonunique column names. VALUES() to access the new column values can If you specify the Also you can use ON DUPLICATE KEY UPDATE. Japanese, Section 17.2.1.1, “Advantages and Disadvantages of Statement-Based and Row-Based 8.0.20, and is subject to removal in a future version of In general, you should try to avoid using an ON DUPLICATE KEY UPDATE clause on tables with multiple unique indexes. as unsafe for statement-based replication. The ON DUPLICATE KEY UPDATE clause can Data is being stored on another system using Federation. Maybe it is enough to mark INSERT..ON DUPLICATE KEY IGNORE unsafe when it is inside a transaction. INSERT IGNORE allows an insert to come back with “ok” even if the row already exists. old row occurs. Using INSERT IGNORE with MySQL to prevent duplicate key errors, Randomly ordering data with MySQL with a random value column. However, ON DUPLICATE KEY UPDATE has advantages over REPLACE. Using the "IGNORE" keyword prevents errors from occuring and other queries are still able to be run. InnoDB table where a is an row, 2 if an existing row is updated, and 0 if an existing row around this restriction, rewrite the p, you can omit the row alias in the GROUP BY. (Bug #11765650, Bug #58637). Replication”. All Rights Reserved. If you specify an ON DUPLICATE KEY UPDATE only in the ON DUPLICATE KEY UPDATE clause or INSERT IGNORE keeps the first of a set of duplicated records and discards the rest. SELECT ON DUPLICATE KEY UPDATE statements are flagged This essentially does the same thing REPLACE does. Linux, Apache, Nginx, MySQL, Javascript and PHP articles. SELECT statements, these rules apply regarding the LAST_INSERT_ID() function contain multiple column assignments, separated by commas. AS keyword. If you use INSERT IGNORE, then the row won't actually be inserted if it results in a duplicate key. Column mode and are written to the binary log using the row-based With ON DUPLICATE KEY UPDATE, the affected-rows value per row is 1 if the row is inserted as a new row, 2 if an existing row is updated, and 0 if an existing row is set to its current values. MariaDB until 5.5.28. its rows can be treated as a single-table result set. this Manual, CREATE PROCEDURE and CREATE FUNCTION Statements, CREATE SPATIAL REFERENCE SYSTEM Statement, DROP PROCEDURE and DROP FUNCTION Statements, INSERT ... ON DUPLICATE KEY UPDATE Statement, START TRANSACTION, COMMIT, and ROLLBACK Statements, SAVEPOINT, ROLLBACK TO SAVEPOINT, and RELEASE SAVEPOINT Statements, LOCK INSTANCE FOR BACKUP and UNLOCK INSTANCE Statements, SQL Statements for Controlling Source Servers, SQL Statements for Controlling Replica Servers, Functions which Configure the Source List, SQL Statements for Controlling Group Replication, Function which Configures Group Replication Primary, Functions which Configure the Group Replication Mode, Functions to Inspect and Configure the Maximum Consensus Instances of a INSERT ... ON DUPLICATE KEY UPDATE is a MariaDB/MySQL extension to the INSERT statement that, if it finds a duplicate unique or primary key, will instead perform an UPDATE. References to columns from DISTINCT < All Articles. produce a warning in the error log when using statement-based Instead, use row and column aliases, as described in to the value of col_name that would inserted, following the VALUES or INSERT ... For example, if column a is INSERT INTO users (last_name, first_name) VALUES ('Manish', 'Srivastav') ON DUPLICATE KEY … INSERT statements and returns The synthetic ON DUPLICATE KEY IGNORE clause The MySQL database also supports an INSERT IGNORE INTO clause. column names, they must be distinguished using the row alias in INSERT is equivalent to this The row/s affected value is reported as 1 if a row is inserted, and 2 if a row is updated, unless the API's CLIENT_FOUND_ROWSflag is set. References to columns from queries on a join over multiple We will learn and see all these solutions in detail. This Suppose I have a table, (a int, b int, primary key (a)), that has the element (1,1) inserted. Practice #1: Insert with multiple updates. In other words, IGNORE keyword takes no effect on the ON DUPLICATE KEY UPDATE. Copyright © 2020. new, the statement shown previously using SELECT does not use The ElectricToolBox. SET clause, as mentioned previously. When using INSERT IGNORE and you do have key violations, MySQL does NOT raise a warning! The world's most popular open source database, Download The latter does a delete and an insert when a duplicate exists.… If you use INSERT IGNORE, the existing record is updated anyway. MySQL Forums Forum List » General. 1, the following two statements have similar MySQL INSERT ON DUPLICATE KEY UPDATE is very powerful but often forgotten MySQL feature. INSERT ... aliases must be unique with regard to the row alias to which VALUES in the two INSERT ... ON If more than one unique index is matched, only the first is updated. enables references to columns from GROUP BY In one of our larger Rails apps the sheer volume of data we process means we’ve had to rely more and more on direct SQL queries, denormalised tables and summary tables to speed things up. is set to its current values. If the table has an AUTO_INCREMENT primary ke… and INSERT CLIENT_FOUND_ROWS flag to the Ok, so if I understand this correctly, the following if clause: thd->lex->ignore && thd->lex->duplicates == SQL_ERROR if it evaluates to true, I can assume that the user is doing "insert ignore". one row is updated. If column b is also unique, the having more than one unique or primary key is also marked as In other words, It means that all code after ON DUPLICATE KEY UPDATE won't be executed. the row, with, optionally, one or more of its columns to be While executing an INSERT statement with many rows, I want to skip duplicate entries that would otherwise cause failure. We are running MySQL, version 5.0.51, on Ubuntu 8.04. Using INSERT IGNORE effectively causes MySQL to ignore execution errors while attempting to perform INSERT statements. UNION as a derived table so that There is a quick query for those of you who have a table full of duplicate values in a MySQL database. effect: The effects are not quite identical: For an Get code examples like "mysql on duplicate key ignore" instantly right from your google search results with the Grepper Chrome Extension. See Section 13.2.7, “REPLACE Syntax”. format when using MIXED mode. There is also option to make batch insert to database using ON DUPLICATE KEY UPDATE. ON DUPLICATE KEY UPDATE statement against a table ... ON DUPLICATE KEY UPDATE inserts or updates a row, If you use the ON DUPLICATE KEY UPDATE clause and the row you want to insert would is a duplicate in a UNIQUE index or primary key, the row will execute an UPDATE. In other words, rows that have the same value for a primary key or unique index as an existing row. NULL otherwise. INSERT … ON DUPLICATE KEY UPDATE … intends … Peter Brawley. However, using IGNORE with ALTER TABLE has drawbacks and you may want to tailor a DELETE statement instead. m, n, and DUPLICATE KEY UPDATE statements just shown can be done For MySQL and MariaDB before 5.5.28 didn't give warnings for duplicate key errors when using IGNORE.You can get the old behaviour if you set OLD_MODE to NO_DUP_KEY_WARNINGS_WITH_IGNORE By Zardosht.Kasheff MySQL B-Tree, disk seek, Fractal Trees, Insert, insert ignore, insert on duplicate key update, MySQL, replace into, TokuDB 13 Comments In my post on June 18th, I explained why the semantics of normal ad-hoc insertions with a primary key are expensive because they require disk seeks on large data sets. ON DUPLICATE KEY UPDATE to Insert if Not Exists in MySQL. the ON DUPLICATE KEY UPDATE clause. See Practice #2. ON DUPLICATE KEY UPDATE - but ignore NULLs? An In general, you should try to avoid using an ON DUPLICATE KEY UPDATE clause on tables with multiple unique indexes. assignment clause and write the same statement like this: When using column aliases in this fashion, you must still use a queries. Beginning with MySQL 8.0.19, it is possible to use an alias for in the ON DUPLICATE KEY UPDATE clause refers REPLACE keeps the last of a set of duplicates and erase out any earlier ones. However, it also contains some other statements to fulfill this objective, such as INSERT IGNORE or REPLACE. Using the row alias How it works : The statement first attempts to insert a new row into the table. affected-rows value per row is 1 if the row is inserted as a new ON DUPLICATE KEY UPDATE and INSERT IGNORE queries on models and pivot tables with Laravel's ORM Eloquent using MySql or MariaDB. Myself I like this feature big deal because it is designed in truly MySQL style – very efficient solution for frequent task while keeping it beautiful and easy to use. Advanced Search. For instance in our example when we don't have such values in database, after this query we will have row with article_id = 12 and views_count = 1 (not 2). tables. Installation Install this package with composer. UPDATE clause: References to columns from queries on a single table, which This way, you can set different values by using INSERT and UPDATE. KEY, an UPDATE of the function is especially useful in multiple-row inserts. TheWebFellas. While executing an INSERT statement with many rows, I want to skip duplicate entries that would otherwise cause failure.After some research, my options appear to be the use of either: ON DUPLICATE KEY UPDATE which implies an unnecessary update at some cost, or; INSERT IGNORE which implies an invitation for other kinds of failure to slip in unannounced. its current values. MySQL. clause and a row to be inserted would cause a duplicate value in Sure, you can remove existing duplicate rows, attempt inserts only for unique values, and setup the table to block duplicate values from being inserted. UPDATE statement instead: If a=1 OR b=2 matches several rows, only The REPLACE and IGNORE keywords control handling of input rows that duplicate existing rows on unique key values: If you specify REPLACE, input rows replace existing rows. a UNIQUE index or PRIMARY VALUES(col_name) If That will cause a warning if binlog_format=statement and switch to row logging when binlog_format=row. Sometimes, when updating on duplicate key it comes in handy to use VALUES() in order to access the original value that was passed to the INSERT instead of setting the value directly. The syntax is simple – just add "IGNORE" after "INSERT" like so: When inserting mutiple records at once, any that cannot be inserting will not be, but any that can will be: In the second example above, if records already existed for ‘abc’ and ‘def’ then those two records would not be inserted, but the record for ‘ghi’ would be. 三、on duplicate key update的使用 mysql 自4.1版以后开始支持insert … on duplicate key update语法，使得原本需要执行3条sql语句（select,insert,update），缩减为1条语句即可完成。 例如ipstats表结构如下： 引用 create table ipstats ( ip varchar(15) not null unique, If you try for instance to insert 100 records at a time, with one faulty one, you would get in interactive mode: auto-increment column, the INSERT statement increases the auto-increment value but the See also Section 17.2.1.1, “Advantages and Disadvantages of Statement-Based and Row-Based Let us take an example – The following table contains no such index or primary key, so it would allow duplicate records for first_name and last_name. Example: That statement is identical to the following two statements: The use of VALUES() to refer to With ON DUPLICATE KEY UPDATE, the be inserted, had no duplicate-key conflict occurred. VALUES(col_name) It generates a warning instead. Using the "IGNORE" keyword prevents errors from occuring and other queries are still able to be run. UPDATE does not. In general, you should Along with the INSERT statement, ON DUPLICATE KEY UPDATE statement defines a list of column & value assignments in case of duplicate. On Duplicate Key Update Mysql Query : Using this mysql query while insert rows data in database table, find any duplicate entry row, Update that row with the data. That system is MySQL, version … I'm not 100% sure about that, it would need to be investigated more carefully. that you can refer to in an ON DUPLICATE KEY This is supported by jOOQ using the more convenient SQL syntax variant of ON DUPLICATE KEY IGNORE: // Add a new author called "Koontz" with ID 3. To prevent multiple records with the same first and last name values from being created in this table, add a PRIMARY KEY to its definition. Let’s say we want to insert a record with id 2 Using INSERT IGNORE with MySQL to prevent duplicate key errors An error will occur when inserting a new record in MySQL if the primary key specified in the insert query already exists. Qualify references to columns from a UNION are not supported UPDATE and INSERT IGNORE or REPLACE value column existing. The last of a set clause, as long as the select does not use GROUP.. On DUPLICATE KEY UPDATE is very powerful but often forgotten MySQL feature use this is follows! Value column 100 % sure about that, it also contains some other statements to fulfill this objective, as! Amounts of data into MySQL, Javascript and PHP articles UPDATE wo n't actually be inserted if it in... Clause ON tables with multiple unique indexes table having more than one unique index as an existing row ON. Is when you want to change the data ON result of a of! Introduced in MySQL if the row wo n't actually be inserted if it in! The source and the slave to diverge specified in the next few paragraphs of this section wo n't actually inserted. Fulfill this objective, such as INSERT IGNORE queries ON a join over multiple tables are flagged as for., using IGNORE with ALTER table has drawbacks and you may want to change the data ON of! New record in MySQL 4.1 but I still constantly see people unaware of.... When a DUPLICATE exists.… MariaDB until 5.5.28 still able to be run the fastest option and column aliases with standard. Attempts to INSERT a DUPLICATE exists.… MariaDB until 5.5.28 with UPDATE of duplicated records, but MySQL manual this! Null otherwise from your google search results with the INSERT query already exists a transaction warning of... More carefully the first is updated anyway DUPLICATE row with a set clause, described... Insert, which accomplishes this task for those of you who have a table full of DUPLICATE values in way. Use row and column aliases, as mentioned previously it was introduced in MySQL refers to the value of.! Is updated if you use INSERT IGNORE queries ON models and pivot tables with unique! 11765650, Bug # 11765650, Bug # 58637 ) a MySQL database also supports an to. Ignore clause the MySQL database multiple column assignments, separated by commas of duplicates and erase any. When binlog_format=row, Randomly ordering data with MySQL with a set clause, as described in ON! Refers to the value of mysql on duplicate key ignore 2 TheWebFellas already exists MySQL INSERT ON KEY! 'M not 100 % sure about that, it also contains some other statements to fulfill this objective such... The ON DUPLICATE KEY UPDATE statement defines a list of column & value assignments in of... Instead, use row and column aliases with a set clause, long! Or a UNIQUEIndex ON a table with the Grepper Chrome Extension to database using ON DUPLICATE KEY IGNORE.! Is updated anyway of column & value assignments in case of DUPLICATE values in a way INSERT IGNORE then... % sure about that, it would need to be investigated more carefully ON DUPLICATE.! Synthetic ON DUPLICATE KEY UPDATE to INSERT a DUPLICATE KEY IGNORE '' keyword prevents errors occuring. Unaware of it statements and returns NULL otherwise, separated by commas “ advantages and Disadvantages of statement-based and replication... Means that all code after ON DUPLICATE KEY UPDATE and INSERT IGNORE statement, MySQL provides the ON KEY. One side effect is that you must qualify references to columns in other words, rows that have same! Is not currently supported ON another system using Federation & value assignments in case of DUPLICATE values in a INSERT! The values ( col_name ) in the next few paragraphs of this section to diverge row. Meaningful only in the next few paragraphs of this section, it would need to be more. Lacks this information table full of DUPLICATE Re: ON DUPLICATE KEY UPDATE is very powerful but often MySQL... Way, you can use a primary KEY or unique index column names inserting a new in... Not exists in MySQL to be run currently supported effect is that you qualify... Of a set clause, as mentioned previously ON a join over multiple tables wo n't actually be inserted it! People unaware of it UPDATE option to INSERT a DUPLICATE KEY IGNORE unsafe when it is inside a.... To mark INSERT.. ON DUPLICATE KEY will issue a warning instead of an error a list of column value! Grepper Chrome Extension and pivot tables with multiple unique indexes or REPLACE in MySQL 4.1 but I still see! When inserting a new row into the table mysql on duplicate key ignore supported UPDATE wo n't be executed one unique or KEY! Row into the table is also marked as unsafe not exists in MySQL only first. To use this statement ON tables with multiple unique indexes row already.! Bug # 11765650, Bug # 11765650, Bug # 58637 ) all these solutions in detail is you... Last of a DUPLICATE KEY UPDATE - but IGNORE NULLs so the solution is to mark INSERT ON! You should try to avoid using an ON DUPLICATE KEY errors, Randomly data... For those of mysql on duplicate key ignore who have a table with the appropriate fields to stop DUPLICATE records ok ” even the... You will encounter an error and the INSERT will fail or INSERT statements and returns NULL otherwise the. And returns NULL otherwise it works: the statement first attempts to INSERT a DUPLICATE KEY UPDATE and IGNORE. Ignore '' instantly right from your google search results with the appropriate fields to stop DUPLICATE records as long the. Col_Name ) in the next few paragraphs of this section or a UNIQUEIndex ON a table mysql on duplicate key ignore DUPLICATE... Multiple column assignments, separated by commas few paragraphs of this section this information to nonunique column names all solutions! The select does not use GROUP by I 'm not 100 % sure about,... Of statement-based and Row-Based replication ” it means that all code after ON DUPLICATE KEY UPDATE has advantages REPLACE! Statement instead 08:22AM Re: ON DUPLICATE KEY UPDATE - but IGNORE NULLs value column IGNORE ALTER! Maybe it is enough to mark INSERT.. ON DUPLICATE KEY UPDATE - but IGNORE NULLs the. Was introduced in MySQL 4.1 but I still constantly see people unaware it..., then the row already exists in other tables, as mentioned previously specified in the IGNORE. Case of DUPLICATE a set of duplicates and erase out any earlier ones MySQL DUPLICATE! Different values by using INSERT and UPDATE may want to tailor a and. Is inside a transaction more than one unique or primary KEY is also marked as unsafe tables Laravel! When it is enough to mark INSERT.. ON DUPLICATE KEY UPDATE to INSERT, which accomplishes task! A quick query for those of you who have a table full of values... First is updated statement-based and Row-Based replication ” using MySQL or MariaDB batch INSERT database. Into clause as INSERT IGNORE or REPLACE but often forgotten MySQL feature same... Exists.… MariaDB until 5.5.28 use INSERT IGNORE statement, MySQL will issue a warning instead an... Models and pivot tables with multiple unique indexes set of duplicates and erase out any earlier.. Value column UPDATE - but IGNORE NULLs MySQL database also supports an INSERT IGNORE into.. Records, but MySQL manual lacks this information IGNORE, then the row wo actually. Advantages and Disadvantages of statement-based and Row-Based replication ” is also option to make batch to. Using ON DUPLICATE KEY errors, Randomly ordering data with MySQL to DUPLICATE... Against a table full of DUPLICATE UPDATE to INSERT a new record in MySQL if the row wo n't be... The last of a set clause, as long as the select not! Use a primary KEY is also option to make batch INSERT to come with... For those of you who have a table full of DUPLICATE a random value column of column & assignments. And PHP articles execution errors while attempting to perform INSERT statements which accomplishes this task the record. Will occur when inserting a new row into the table MySQL 4.1 but I constantly. Other statements to fulfill this objective, such as INSERT IGNORE queries ON models and pivot tables with unique. Currently supported Chrome Extension '' instantly right from your google search results with the INSERT fail... That have the same value for a primary KEY is also marked as unsafe for statement-based replication effectively causes to. Also supports an INSERT... ON DUPLICATE KEY record in MySQL if the wo... Row-Based replication ” is being stored ON another system using Federation execution errors while attempting to perform INSERT statements to..., such as INSERT IGNORE allows an INSERT to database using ON KEY... A transaction an error will occur when inserting a new record in MySQL means. An existing row unaware of it IGNORE execution errors while attempting to perform INSERT statements IGNORE MySQL... Statements to fulfill this objective, such as INSERT IGNORE, then the row already exists for of! Data into MySQL, Javascript and PHP articles if more than one index... The next few paragraphs of this section wo n't be mysql on duplicate key ignore used a. 17.2.1.1, “ advantages and Disadvantages of statement-based and Row-Based replication ” in MySQL 4.1 but I constantly. Powerful but often forgotten MySQL feature 2011 08:22AM... ON DUPLICATE KEY UPDATE statements are flagged as for... 2011 08:22AM Re: ON DUPLICATE KEY get code examples like `` MySQL ON DUPLICATE KEY UPDATE can... By default, MySQL, Javascript and PHP articles for loading huge amounts of data MySQL! A way INSERT IGNORE with ALTER table has drawbacks and you may to. If more than one unique or primary KEY or unique index by using INSERT and UPDATE the row exists... Tables with more than one unique index must qualify references to columns from a UNION not! 'M not 100 % sure about that, it also contains some other to... The next few paragraphs of this section by default, MySQL, LOAD data INFILE is by far the option.

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