Updating a specific row in sql Free sexy chatterbots with pictures

posted by | Leave a comment

Let us start with a simple table: UPDATE staff SET salary = 1200 WHERE name = ' Bob'; UPDATE staff SET salary = 1200 WHERE name = ' Jane'; UPDATE staff SET salary = 1200 WHERE name = ' Frank'; UPDATE staff SET salary = 1200 WHERE name = ' Susan'; UPDATE staff SET salary = 1200 WHERE name = ' John'; UPDATE staff SET salary = 1200 WHERE name = ' Bob'; UPDATE staff SET salary = 1250 WHERE name = ' Jane'; UPDATE staff SET salary = 1200 WHERE name = ' Frank'; UPDATE staff SET salary = 1250 WHERE name = ' Susan'; UPDATE staff SET salary = 1200 WHERE name = ' John'; We are no longer setting all the salary fields to the same value, so we can’t collapse it into a single statement.

But we can group the updates according to the value being set, and then do one UPDATE statement per distinct value.

You can use a database link to update a remote object only if you are using Oracle Database distributed functionality.

However in some cases specifying the partition name can be more efficient than a complicated Specify a complete or partial name of a database link to a remote database where the object is located.

Suppose we want to find employee with 4th highest salary.

SELECT Employee Id, Employee Name, Salary FROM Employees Employee Id Employee Name Salary ------------------------------------- 1002 Alden 4000 2343 Lawson 4500 2004 Barbra 4800 1105 Marsden 4500 31 SELECT ROW_NUMBER() OVER (ORDER BY Employee Name) AS Row, Employee Id, Employee Name, Salary FROM Employees Row Employee Id Employee Name Salary ------------------------------------------- 1 1002 Alden 4000 2 2343 Lawson 4500 3 2004 Barbra 4800 4 1105 Marsden 4500 5 31 Using ROW_NUMBER() for calculating Nth highest salary We can utilize this function for calculating Nth highest salary of a employee.

When used in the subquery of a DML statement, you can specify this clause in a subquery in the can be a subquery, a column, a function, or a collection constructor.

Regardless of its form, it must return a collection value—that is, a value whose type is nested table or varray.

Leave a Reply

dating in louth lincolnshire