Updating multiple rows at a time in sql

The object_id is the primary key of the object that can be liked, which is equivalent to an external key, but the data consistency of association tables will be guaranteed by the application logic, and it will not be aware of the database; the count field records the number of likes of this object.

-------------- ------------ ------ ----- --------- ---------------- | Field | Type | Null | Key | Default | Extra | -------------- ------------ ------ ----- --------- ---------------- | id | bigint(20) | NO | PRI | NULL | auto_increment | | gmt_created | datetime | NO | | NULL | | | gmt_modified | datetime | NO | | NULL | | | object_id | bigint(20) | NO | | NULL | | | count | bigint(20) | NO | | 0 | | -------------- ------------ ------ ----- --------- ---------------- Then we click Like on the page.

With table-valued parameters, available in SQL Server 2008, the update process is easy to implement and has little performance impact on the database.

I have about 60,000 rows that I'm needing to update the information from column_a to column_b.The id is an incremental primary key without business meaning.The gmt_xxx contains the record creation and update time without business meaning.Subclasses should override the default behavior, which is a straight identity comparison.**kw are arguments consumed by subclass compare() methods and may be used to modify the criteria for comparison. Common table expressions are a SQL standard whereby SELECT statements can draw upon secondary statements specified along with the primary statement, using a clause called “WITH”.

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