sql replace into

This article combines a large number of articles related to SQL replace into and focuses their usage and advantages in this article. If you need some commands, you can take a closer look. The following is a more detailed description of the algorithm

The following is a more detailed description of the algorithm used (the algorithm is also used for load DATA ...). REPLACE): 1. Try inserting the new row into the table 2. When an insert fails because of a duplicate keyword error for a primary key

When inserting data into a table, we often encounter situations such as: 1, first to determine whether the data exists, 2, if it does not exist, then insert; 3, if present, update. This can be handled in SQL Server:If not exists (select 1 from t

SQL replace into usage detailed description The run of replace is similar to insert. With one exception, if an old record in the table is used with a primary Key or a new record of a unique index has the same value, the old record is deleted

SQL replace into usage Replace runs like insert. There is only one exception. Assume that an old record in the table and a record used for primary If the new record of a key or unique index has the same value, the old record is deleted before the

SQL replace into usage detailed descriptionThe replace operation is similar to insert. There is only one exception, if an old record in the table is used with a primaryA new record of key or a unique index has the same value, and the old record is

The run of replace is very similar to insert. Except for one point, if an old record in the table has the same value as a new record for primary key or a unique index, the old record is deleted before the new record is inserted. Note that it is

This article is a detailed analysis of the difference between replace into and insert into SQL statements, the need for a friend under the reference The run of replace is similar to insert. With one exception, if an old record in the table has the

Original link: http://www.jb51.net/article/47090.htm Today listen to colleagues about Oracle to MySQL data migration, he used insert into ... on duplicate key Update ..., I was thinking how not to replace it, so I came back to look carefully, they

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