Updating joined tables milf cougar dating

28-Dec-2017 22:52

This isn't necessarily a very realistic example as you would be more likely to want to straight out delete the non-matching entries or use a select query instead to display them in a list for editing but it illustrates how it can be done.

The article about how to delete records with My SQL using a cross join uses these examples to delete instead of update.

Let's say for example you have a product table which stores information about products and a product Price table which has pricing information and you want to update the prices based on when the product was created (in the examples below you want to discount all your older stuff to 80% of the current price). The first is do do a join using commas, like so: The second way is to use inner join syntax as shown below.

This syntax is slightly more flexible as it means you can use left and right joins as well as inner joins, whereas the previous example is an implicit inner join.

Note: It is not necessary that the key or keys of a table be selected for it to be key preserved.

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So, a key-preserved table has its keys preserved through a join.SELECT COLUMN_NAME, UPDATABLE FROM USER_UPDATABLE_COLUMNS WHERE TABLE_NAME = 'EMP_DEPT'; COLUMN_NAME UPD ------------------------------ --- EMPNO YES ENAME YES DEPTNO YES SAL YES DNAME NO LOC NO 6 rows selected.statement lets you locate recompilation errors before run time.SELECT * FROM Division1_staff; ENAME EMPNO JOB DNAME ------------------------------------------------------ CLARK 7782 MANAGER ACCOUNTING KING 7839 PRESIDENT ACCOUNTING MILLER 7934 CLERK ACCOUNTING ALLEN 7499 SALESMAN SALES WARD 7521 SALESMAN SALES JAMES 7900 CLERK SALES TURNER 7844 SALESMAN SALES MARTIN 7654 SALESMAN SALES BLAKE 7698 MANAGER SALES This error message is returned when a view exists but is unusable due to errors in its query (whether it had errors when originally created or it was created successfully but became unusable later because underlying objects were altered or dropped). Additionally, if a view is a join on other nested views, then the other nested views must be mergeable into the top level view.

For a discussion of mergeable and unmergeable views, and more generally, how the optimizer optimizes statements that reference views, see the Examples illustrating the rules for inherently updatable join views, and a discussion of key-preserved tables, are presented in following sections.

You can use views in almost the same way as tables.

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