Sql updating a table with values from another table rogers dating site
It’s rare, in fact, that the data with which you are working is just a single value, so records and other composite datatypes are likely to figure prominently in your PL/SQL programs.This article explores how you declare records, populate them with rows from a table, and even insert or change an entire row in a table by using a record.Because only one exception can be raised at a time in a session, it doesn’t make any sense to allow you to check for two (or more) exceptions in a single handler.For full explanations of both of these answers, visit plsqlchallenge.com, register or log in, and click the Closed/Taken tab in Play a Quiz.The following block uses a cursor FOR loop to fetch only the last name of each employee, deposit that name into a record, and then display the value of the last_name field of that record: You can define parameters based on record types, and you can therefore pass records as arguments to subprograms.
So when you use %ROWTYPE to pass arguments to subprograms, make sure to review the subprogram logic after any change to the table.
It also takes a look at record types, which enable you to work with records that are not necessarily related to a relational table.
PL/SQL makes it very easy to declare records that have the same structure as a table, a view, or the result set of a cursor by offering the %ROWTYPE attribute.
If the database administrator changes the maximum length of the last_name column to 200, for instance, this procedure’s status will be changed to INVALID.
When the procedure is recompiled, the compiler will update the definition of the record in this procedure to match the table’s new structure.
Suppose I have an employees table in an application that looks like this: CREATE PROCEDURE process_employee ( employee_id_in IN omag_employees.employee_id%TYPE) IS l_employee_id omag_employees.employee_id%TYPE; l_last_name omag_employees.last_name%TYPE; l_salary omag_employees.salary%TYPE; BEGIN SELECT employee_id, last_name, salary INTO l_employee_id, l_last_name, l_salary FROM omag_employees WHERE employee_id = employee_id_in; END; (Note that I use suffixes in my parameters to indicate their mode.