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Today, I heard from my colleagues about the data migration from Oracle to MySQL. He used insert ..... on duplicate key update ..., I was wondering why I didn't need Replace at the time, so I checked them back and found out the difference. Let's look

The use of REPLACE into is similar to insert, and ultimately the purpose in the table is to insert a new row of data. The difference is that when a primary key or a unique index conflict occurs when inserting, the original record is deleted and the

Online about Insert ... On DUPLICATE KEY Update most articles are the same article, first of all the purpose of this syntax is to resolve the repetition, when there is a record in the database, the execution of this statement will update it, and the

Prior to the wormhole (we developed a large volume data transmission tool, similar to Apache Sqoop, Taobao datax) MySQL writer supports insert into and replace into two ways into the MySQL table. Now there is a need to support the update part of the

Prior to the wormhole (we developed a large volume data transmission tool, similar to Apache Sqoop, Taobao datax) MySQL writer supports insert into and replace into two ways into the MySQL table. Now there is a need to support the update part of

In terms of efficiency, INSERT ... On DUPLICATE KEY UPDATE is better than replace, after all, replace deletes and inserts if repeated. And replace also has side effects: 1. Replace each time to reassign the ID; 2. When a delete is executed in

Insert on Dumplicate Update when the primary key is the same update, the contents of the update change to 1 Multiple contents of update are separated by commas ... And notmysql> insert INTO ' 200702 ' (' Domain ', ' 2nd_domain ', ' TLD ', '

MySQL insert data, if present, updateINSERT into Subs (Subs_name, Subs_email, Subs_birthday) VALUES (?, ?, ?) on KEY UPDATE subs_name =VALUES(subs_name), = VALUES(Subs_birthday)If you are working in bulk, use Python:sql ="INSERT INTO

After encountering this problem, the first reaction is caused by the number of columns, but I check the SQL, found that the number of columns is the same, but the insertion is still a problem, and then write a simple SQL Insert is not empty field,

1. Environmental descriptionSuSE One-SP1 x86_64 + MySQL 5.5.37Blog Address: http://blog.csdn.net/hw_libo/article/details/39583247The test table Order_line has 320 million data, approximately 37G in size:ndsc02:/data/mysql/mysql3306/data/tpcc1000 #

INSERT into User_tag_exp (uid,tag,detail) VALUES (?,?,?) On DUPLICATE KEY UPDATE detail=. See the program actually found that MySQL has this function. Previously written procedures ah ................ MySQL has been supporting inserts since

MySQL "on duplicate key update" SyntaxIf the on duplicate key update is specified at the end of the insert statement and the duplicate value appears in a unique index or primary key after the row is inserted, update is executed on the row with the

We all know that to allow form to submit files, you need to specify Enctype=multipart/form-data on the form, so that you can upload files, about enctype article a lot, no longer explain. The problem is that the html.beginform () of MVC is used to

Replace into and Insert... on duplicate key update... what's really different today I heard from my colleagues about the data migration from oracle to mysql. He used Insert ..... on duplicate key update ..., I was wondering why I didn't need Replace

Previous work to do data synchronization used in the trigger, made the following notes, summarized as follows: Data center----------------------------------College Create or replace trigger TGER_XX_YXSDWJBSJZ L_ist before insert on ZFDXC.

MySQL database Advanced (v)--trigger one, Introduction to triggers 1, Introduction to TriggersA trigger is a special stored procedure associated with a table that triggers execution when data is inserted, deleted, or modified in a table, with finer

Oracle trigger 2-DML trigger DML trigger is the most common trigger type, developers use more, while other types of triggers are mainly used for database management or audit, while DBA uses more. 1. Introduction to DML triggers: BEFORE triggers are

DML triggers are the most common types of triggers, which are used by developers. Other types of triggers are mainly used for database management or audit, while DBA is usually used. 1. Introduction to DML triggers: Before trigger This trigger

Replaceinto and Insertinto... onduplicatekeyupdate... true difference bitsCN.com The real difference between Replace into and Insert into... on duplicate key update... in MySQL Today, I heard from my colleagues about the data migration from oracle

Oracle stored procedures and trigger data copying Code. For more information, see. Oracle stored procedures and trigger data copying Code. For more information, see. I. Creation and use of stored procedures 1. Create a package and create a stored