Updating a view in plsql house dating uk
The column aliases following the statement and in most types of subqueries.
The query name is visible to the main query and to all subsequent subqueries.
A cursor is a temporary work area created in the system memory when a SQL statement is executed.
A cursor contains information on a select statement and the rows of data accessed by it.
For recursive subquery factoring, the query name is even visible to the subquery that defines the query name itself.
if you want the database to return only one copy of each set of duplicate rows selected. Duplicate rows are those with matching values for each expression in the select list.
Using the dbms_session package to identify individual users is the topic discussed in the next section.
In Oracle, truncating a table is a fast way to clear out records from a table if you don't need to worry about rolling back.
For the purposes of name resolution, these function names have precedence over schema-level stored functions.Triggers are, in fact, written to be executed in response to any of the following events − CREATE [OR REPLACE ] TRIGGER trigger_name [OF col_name] ON table_name [REFERENCING OLD AS o NEW AS n] [FOR EACH ROW] WHEN (condition) DECLARE Declaration-statements BEGIN Executable-statements EXCEPTION Exception-handling-statements END; Select * from customers; ---- ---------- ----- ----------- ---------- | ID | NAME | AGE | ADDRESS | SALARY | ---- ---------- ----- ----------- ---------- | 1 | Ramesh | 32 | Ahmedabad | 2000.00 | | 2 | Khilan | 25 | Delhi | 1500.00 | | 3 | kaushik | 23 | Kota | 2000.00 | | 4 | Chaitali | 25 | Mumbai | 6500.00 | | 5 | Hardik | 27 | Bhopal | 8500.00 | | 6 | Komal | 22 | MP | 4500.00 | ---- ---------- ----- ----------- ---------- The following program creates a row-level trigger for the customers table that would fire for INSERT or UPDATE or DELETE operations performed on the CUSTOMERS table.This trigger will display the salary difference between the old values and new values − 0) DECLARE sal_diff number; BEGIN sal_diff := : NEW.salary - : OLD.salary; dbms_output.put_line('Old salary: '
In the above example, the set_module procedure sets the value of the module column in the v$session view to add_order, while the action column is set to the value insert into orders.The set of rows the cursor holds is called the set.