to allow inserting and updating exactly the desired data.These features provide a lot of power and flexibility, making My SQL significantly more capable than it otherwise might be. I hope I don't infuriate anyone for whom Oracle is a religion by saying this.
I can select the records fine with this syntax (testing in Oracle SQL* Plus) SELECT NAMEINFO. When you give a table expression a correlation name, it is to act as if a materialized table with that correlation name has been created in the database.
REGION FROM NAMEINFO, ADDRESSINFO WHERE ADDRESSINFO. It will work either way, but it isn't logical to write Value = COLUMN. Brian The UPDATE clause simply gives the name of the base table or updatable view to be changed.
For example to raise the salary by Rs.500 of employee number 104. update emp set sal=sal 500 where empno = 104; In the above statement if we did not give the where condition then all employees salary will be raised by Rs. That’s why always specify proper WHERE condition if don’t want to update all employees.
For example We want to change the name of employee no 102 from ‘Sami’ to ‘Mohd Sami’ and to raise the salary by 10%. update emp set name=’Mohd Sami’, sal=sal (sal*10/100) where empno=102; Now we want to raise the salary of all employees by 5%.
I was in Slovenia earlier this week presenting one of the “Celebrity Seminars” for Oracle University.
The audience was very good, and had some interesting questions and observations.
TOWN; However, I tried to update the names and failed. I wasn't sure whether or why you were trying to do an outer join, so I put that part of the syntax in brackets.
I've spent my career interested in relational theory without respect to any particular implementation. First, JOINS should never be done in the WHERE clause. They should be done using the appropriate JOIN syntax; this keeps the distinction between joins and restricts clear.
What I want to do is either insert only the new rows, or insert the new rows and update the changed rows (depending on the scenario). If I want to insert only the rows that will not violate the unique index, I can: Which method to use largely depends on requirements.