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Posted by / 20-Mar-2020 06:38

Updating views in mysql

In addition, you can use DELETE statement to remove rows of the underlying table through the view.However, to create an updatable view, the SELECT statement that defines the view must not contain any of the following elements: If you create a view with the TEMPTABLE algorithm, you cannot update the view.I am creating a view to show the user his/her data, but I also want the user to be able to make changes in some of the fields in those views.Are the changes made in a view reflected in the base table as well?Also, would I be able to update a view that is made up of more than one base table? 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.Summary: in this tutorial, we will show you how to create an updatable view and update data in the underlying table through the view.If a row is rejected because of the CHECK OPTION, an error similar to the following is produced: ) and WITH CHECK OPTION is similar to a BLACKHOLE table: no row is ever inserted and no row is ever returned.

Example:mysql If a VIEW is not-updatable because of something in the WHERE clause (use of a function for example) then there's a trick to make it updatable again. I am able to create a view for retrieving the records based on some criteria, but does the view only support for retrieving the records or will it support for delete and update the records in the tables.The error is : Lookup Error - My SQL Database Error: You have an error in your SQL syntax; check the manual that corresponds to your My SQL server version for the right syntax to use near 'update onlinetest set experience='1-2Years' where experience='1-2 Years'' at line 1 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.(Note that even if a view is updatable, it might not be possible to insert into it, as described elsewhere in this section.) The updatability of views may be affected by the value of the system variable. Earlier discussion in this section pointed out that a view is not insertable if not all columns are simple column references (for example, if it contains columns that are expressions or composite expressions).Although such a view is not insertable, it can be updatable if you update only columns that are not expressions.

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Note that it is sometimes possible to create updatable views based on multiple tables using an inner join.

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