Updating sql view


09-Oct-2016 17:21

Although such a view is not insertable, it can be updatable if you update only columns that are not expressions.Consider this view: PDF (US Ltr) - 37.9Mb PDF (A4) - 38.0Mb PDF (RPM) - 37.3Mb HTML Download (TGZ) - 10.3Mb HTML Download (Zip) - 10.3Mb HTML Download (RPM) - 8.9Mb Man Pages (TGZ) - 216.7Kb Man Pages (Zip) - 329.5Kb Info (Gzip) - 3.4Mb Info (Zip) - 3.4Mb My SQL Backup and Recovery My SQL Globalization My SQL Information Schema My SQL Installation Guide My SQL and Linux/Unix My SQL and OS X My SQL Partitioning My SQL Performance Schema My SQL Replication Using the My SQL Yum Repository My SQL Restrictions and Limitations Security in My SQL My SQL and Solaris Building My SQL from Source Starting and Stopping My SQL My SQL Tutorial My SQL and Windows My SQL NDB Cluster 7.5 One of the limitations above is that you cannot have duplicate column names.PDF (US Ltr) - 37.9Mb PDF (A4) - 38.0Mb PDF (RPM) - 37.3Mb HTML Download (TGZ) - 10.3Mb HTML Download (Zip) - 10.3Mb HTML Download (RPM) - 8.9Mb Man Pages (TGZ) - 216.7Kb Man Pages (Zip) - 329.5Kb Info (Gzip) - 3.4Mb Info (Zip) - 3.4Mb My SQL Backup and Recovery My SQL Globalization My SQL Information Schema My SQL Installation Guide My SQL and Linux/Unix My SQL and OS X My SQL Partitioning My SQL Performance Schema My SQL Replication Using the My SQL Yum Repository My SQL Restrictions and Limitations Security in My SQL My SQL and Solaris Building My SQL from Source Starting and Stopping My SQL My SQL Tutorial My SQL and Windows My SQL NDB Cluster 7.5 statements, but can only be used for reading data to specify rows to be updated or deleted.Generally, the view references must be updatable, meaning that they may be merged and not materialized. For a view to be updatable, there must be a one-to-one relationship between the rows in the view and the rows in the underlying table.In some No SQL databases, views are the only way to query data.Views can provide advantages over tables: Just as a function (in programming) can provide abstraction, so can a database view.

To be more specific, a view is not updatable if it contains any of the following: .

Sometimes coming up with a short descriptive name for your view is easier said than done. You can also see that we have take the birth date column and calculated age.

The example below shows all of the code from the view.

For information about generated columns, see Section 13.1.18.8, “CREATE TABLE and Generated Columns”.

It is sometimes possible for a multiple-table view to be updatable, assuming that it can be processed with the value for a view has become inaccurate to due to changes to underlying views, the value can be updated by deleting and recreating the view.The name should be somewhat reflective of the purpose of the view. As you can see in our view we are formatting the first and last name.



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