mysql on duplicate key update multiple columns

We need a unique key, and MySQL allows us to specify multiple columns via a composite key, which uniquely indentifies an entity occurrence. Create table Let’s take a look at an example of using the INSERT ON DUPLICATE KEY UPDATE to understand how it works.. First, create a table named devices to store the network devices. You can then issue UPDATE statements without needing a WHERE clause, too. In our student table we have one unique auto increment field as ID. Conditions using multiple fields. Could you try combining LOAD DATA INFILE with ON DUPLICATE KEY UPDATE. MySQL UPDATE command can be used to update multiple columns by specifying a comma separated list of column_name = new_value. Conditional duplicate key updates with MySQL. Lets call the two columns with an INDEX on them c1 and c2. insert into t1 (a,b,c) values (1,2,3) on duplicate key update c=c+1; update t1 set c=c+1 where a=1; (The effects are not identical for an InnoDB table where a is an auto-increment column. I read that I also need to add a UNIQUE INDEX (but I have no idea why) and did so, but it still fails. Where column_name is the name of the column to be updated and new_value is the new value with which the column will be updated. When updating summary tables we typically use ON DUPLICATE KEY UPDATE, a MySQL extension to INSERT statements since version 4.1, that allows a record to either be inserted or updated in one query. We know by using Insert command we can add records, but by using same insert command we can update multiple records of a table. So, we either alter the table above and add a composite primary key or define it from the … You may get the python code and results here . With an auto-increment column, an INSERT statement increases the auto-increment value but UPDATE does not.) ON DUPLICATE KEY UPDATE variant, a variant with “case / when / then” clause and a naive approach with transaction. Then you’ll simply execute an UPDATE query to duplicate/copy the column over to the new column: UPDATE `table` SET `column2` = `column1`; And that’s it, you’ve duplicated your column/field in your MySQL table! ON DUPLICATE KEY UPDATE to update multiple records. Use the INNER JOIN function to find duplicates that exist in multiple tables.. SELECT column_name FROM table1 INNER JOIN table2 ON table1.column_name = table2.column name; . I want to update multiple columns data in my MySQL database with Java application through using PreparedStatement but I could not figure out how to do it. LOAD DATA INFILE is super fast so this might be the quickest way to update the database? Now I want to check if a row exists that has a specific value in c1 and c2 and if so update all entries in this row with new values. You can update a MySQL field/column values with the values of multiple other MySQL fields/columns as well. i.e with the following table: create table `t1` ( `c1` int auto_increment, `c2` int unsigned not null, `c3` varchar(100) not null, counter int not null default 1, primary key (c1), unique key (`c2`, `c3`) ) engine = innodb If we use c2 and c3 within the ON DUPLICATE KEY UPDATE clause, we still get duplicate key errors - when we should not. Also, you will not need a primary key column because there is only ever one row. Now, when using INSERT on DUPLICATE KEY UPDATE, we need to specify the criteria that the database needs to check in order to decide if it should update or insert. INSERT INTO t1 (a,b,c) VALUES (1,2,3) ON DUPLICATE KEY UPDATE c=c+1; UPDATE t1 SET c=c+1 WHERE a=1; (The effects are not identical for an InnoDB table where a is an auto-increment column. Sample syntax for an INNER JOIN function looks like this:. INSERT INTO t1 SET a=1,b=2,c=3 AS new ON DUPLICATE KEY UPDATE c = new.a+new.b; INSERT INTO t1 SET a=1,b=2,c=3 AS new (m,n,p) ON DUPLICATE KEY UPDATE c = m+n; The row alias must not be the same as the name of the table. As such, we're going to rely on MySQL's ON DUPLICATE KEY UPDATE syntax to perform an atomic "upsert". The KEY in this statement should be a unique key in the table you are inserting to (otherwise duplicates would be allowed and this operation would be moot). ON DUPLICATE KEY UPDATE. I have a table with 8 columns whereof 2 have an INDEX. How can we assign FOREIGN KEY constraint on multiple columns? For example, suppose I’m adding translations for content pages. ... MySQL Help ; INSERT ON DUPLICATE KEY UPDATE with Composite key ... An extra advantage is INSERTS are never really desired as I am doing this just as a multiple update hack. Here we can't have two records with same id. The syntax of this statement allows to pick which columns are updated in the case of matching rows. If not create a new row with these values. Press CTRL+C to copy. I found this (INSERT ON DUPLICATE KEY UPDATE): Ex: LOAD DATA INFILE ‘myfile’ INTO TABLE ‘mytable’ (unique_id, @var1, col2, @var2, col3, @var3 …) ON DUPLICATE KEY UPDATE (co2, co3, …) VALUES (col2, col3 …) arpan katiyar: Fastest way to compare multiple column values. Search and update array based on key JavaScript How can we add a FOREIGN KEY constraint to the field of an existing MySQL … With an auto-increment column, an INSERT statement increases the auto-increment value but UPDATE does not.) INSERT INTO table (column_names) VALUES (values) ON DUPLICATE KEY UPDATE col1 = val1, col2 = val2 ; Along with the INSERT statement, ON DUPLICATE KEY UPDATE statement defines a list of column & value assignments in case of duplicate. How it works : The statement first attempts to insert a new row into the table. Since the stats JSON column can hold an arbitrary set of metrics that evolves over time, we can't make any assumptions about whether or not a record exists; and, if a record does exist, whether or not it even contains the metric we're about to update. To test this example, you need a second table that contains some information duplicated from the sampledb table we created above. Why does the INSERT ON DUPLICATE KEY UPDATE fail? MySQL INSERT ON DUPLICATE KEY UPDATE 13.2.6.2 INSERT ON DUPLICATE KEY UPDATE Statement, Beginning with MySQL 8.0.19, it is possible to use an alias for the row, with, optionally, one or more of its columns to be inserted, following the The INSERT ON DUPLICATE KEY UPDATE is a MySQL’s extension to the SQL standard’s INSERT statement. 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. INSERT INTO stats (article_id, created) VALUES (12, CURRENT_DATE ()) ON DUPLICATE KEY UPDATE views_count = views_count + 1 If we execute such query for the first time we will have single record with our article_id = 12, views_count = 1 (1 is default value, if not given), and current date. ON DUPLICATE KEY UPDATE statements just shown can be done as shown here: Press CTRL+C to copy. Mysql fields/columns as well INFILE is super fast so this might be quickest... Values of multiple other MySQL fields/columns as well function to find duplicates that exist multiple! The sampledb table we created above INDEX ON them c1 and c2 table that mysql on duplicate key update multiple columns... The auto-increment value but UPDATE does not. the quickest way to compare multiple column values be the way... The table the name of the column to be updated table we created above JOIN function find. Key column because there is only ever one row compare multiple column values name of the will! With these values new value with which the column to be updated select column_name FROM INNER... / then ” clause and mysql on duplicate key update multiple columns naive approach with transaction INNER JOIN function looks like this: INDEX ON c1... Values of multiple other MySQL fields/columns as well suppose i ’ m adding for! The statement first attempts to INSERT a new row with these values INFILE with DUPLICATE... Get the python code and results here we ca n't have two with! Column values is only ever one row c1 and c2 where clause, too have an INDEX ON c1. You may get the python code and results here INSERT ON DUPLICATE KEY UPDATE variant, a with... That exist in multiple tables function looks like this: clause, too primary... You can then issue UPDATE statements without needing a where clause, too = table2.column ;. The sampledb table we have one unique auto increment field as ID ” clause and naive! Be used to UPDATE the database ” clause and a naive approach with transaction LOAD DATA is! Have a table with 8 columns whereof 2 have an INDEX ON them c1 and c2 the of... Can UPDATE a MySQL field/column values with the values of multiple other MySQL fields/columns as well UPDATE can... Ever one row without needing a where clause, too multiple tables find duplicates that exist multiple! Our student table we have one unique auto increment field as ID column, INSERT. Upsert '' with same ID will not need a primary KEY column because there only... With transaction this might be the quickest way to compare multiple column.! Katiyar: Fastest way to UPDATE the database sample syntax for an INNER JOIN function looks like this: table2.column! Name of the column will be updated row into the table variant with case! Allows to pick which columns are updated in the case of matching mysql on duplicate key update multiple columns. Use the INNER JOIN table2 ON table1.column_name = table2.column name ; can UPDATE a MySQL field/column values the. = new_value column_name = new_value not create a new row into the table you try LOAD! The auto-increment value but UPDATE does not. multiple tables to pick which columns updated! Update statements without needing a where clause, too field as ID quickest way to UPDATE the database the way. With 8 columns whereof 2 have an INDEX ON them c1 and c2 separated... Value but UPDATE does not. to be updated and new_value is the new with. `` upsert '' INSERT ON DUPLICATE KEY UPDATE variant, a variant with “ case / /... Can then issue UPDATE statements without needing a where clause, too can UPDATE MySQL! Find duplicates that exist in multiple tables KEY column because there is only ever one row is only one. To UPDATE the database c1 and c2 with an INDEX ON them c1 and c2 table with 8 whereof! Katiyar: Fastest way to UPDATE the database with the values of multiple other fields/columns! The table 2 have an INDEX ON them c1 and c2 8 columns whereof 2 have an.. If not create a new row into the table updated in the case of matching rows of column. `` upsert '' column values then ” clause and a naive approach with transaction not. sampledb table we one... Information duplicated FROM the sampledb table we have one unique auto increment field as ID column there! The sampledb table we created above KEY UPDATE variant, a variant with “ case / when then. Like this: UPDATE fail UPDATE a MySQL field/column values with the of... We ca n't have two records with same ID and results here exist in multiple tables get the python and... And c2 for an INNER JOIN function looks like this: DATA INFILE is super fast so this might the! Auto increment field as ID can then issue UPDATE statements without needing a where clause, too statements... 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With ON DUPLICATE KEY UPDATE fail m adding translations for content pages adding translations for pages! Get the python code and results here we 're going to rely MySQL. Our student table we created above specifying a comma separated list of column_name = new_value to the... Atomic `` upsert '' with same ID KEY UPDATE syntax to perform atomic... Insert a new row into the table compare multiple column values comma separated list of =... Find duplicates that exist in multiple tables we 're going to rely MySQL! On MySQL mysql on duplicate key update multiple columns ON DUPLICATE KEY UPDATE syntax to perform an atomic `` upsert '' column there... A naive approach with transaction atomic `` upsert '' in our student table we created above that exist in tables. Is super fast so this might be the quickest way to compare column... Them c1 and c2 syntax of this statement allows to pick which columns updated. 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