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To support these techniques in database applications, PL/SQL provides the datatypes , which allow you to declare index-by tables, nested tables and variable-size arrays.
You can pass collection variables as parameters, to move data between client-side applications and stored subprograms.
To look up data that is more complex than single values, you can store PL/SQL records or SQL object types in collections.
You cannot rely on the order and subscripts of a nested table remaining stable as the table is stored and retrieved, because the order and subscripts are not preserved when a nested table is stored in the database.
To create collections, you define a collection type, then declare variables of that type.
When a cursor is based on a join, only the (SELECT MAX(Rate Change Date) FROM Human Resources.
Ambrose Bierce Many programming techniques use collection types such as arrays, bags, lists, nested tables, sets, and trees.
Each varray is stored as a single object, either inside the table of which it is a column (if the varray is less than 4KB) or outside the table but still in the same tablespace (if the varray is greater than 4KB).
You must update or retrieve all elements of the varray at the same time, which is most appropriate when performing some operation on all the elements at once.
When you use a Transact-SQL server cursor, you can update the current row by using an UPDATE statement that includes a WHERE CURRENT OF clause.
Changes made with this clause affect only the row on which the cursor is positioned. Business Entity ID) ; OPEN complex_cursor; FETCH FROM complex_cursor; UPDATE Human Resources.
Both nested tables and associative arrays (formerly known as index-by tables) use similar subscript notation, but they have different characteristics when it comes to persistence and ease of parameter passing.Tags: Adult Dating, affair dating, sex dating