What can be present in the body of forall?
What can be present in the body of a FORALL statement?
- One or more DML statements.
- A single DML statement.
- A single SELECT or DML statement.
- One or more SELECT statement.
What is pseudo column in PL SQL?
A pseudocolumn behaves like a table column, but is not actually stored in the table. You can select from pseudocolumns, but you cannot insert, update, or delete their values. A pseudocolumn is also similar to a function without arguments (please refer to Chapter 5, “Functions”.
What are pseudo records?
They are special as OLD pseudo record holds the column values before start of current transaction and NEW pseudo record holds the column values about to reflect after the transaction completes.
What is Nextval?
The Oracle NEXTVAL function is used to retrieve the next value in a sequence. The Oracle NEXTVAL function must be called before calling the CURRVAL function, or an error will be thrown. No current value exists for the sequence until the Oracle NEXVAL function has been called at least once.
How many times does the forall statement run in DML?
The FORALL statement runs one DML statement multiple times, with different values in the VALUES and WHERE clauses. The different values come from existing, populated collections or host arrays.
How do I refer to a specific field in a forall statement?
You cannot refer to individual record fields within DML statements called by a FORALL statement. Instead, you can specify the entire record with the SET ROW clause in an UPDATE statement, or the VALUES clause in an INSERT statement. Collection subscripts must be just the index variable rather than an expression, such as i rather than i+1.
Can I use the forall statement in a loop?
You can use the FORALL statement only in server-side programs, not in client-side programs. The INSERT, UPDATE, or DELETE statement must reference at least one collection. For example, a FORALL statement that inserts a set of constant values in a loop raises an exception. When you specify an explicit range,…
What are the restrictions of Forall loop in SQL?
Restrictions. The following restrictions apply to the FORALL statement: You cannot loop through the elements of an associative array that has a string type for the key. Within a FORALL loop, you cannot refer to the same collection in both the SET clause and the WHERE clause of an UPDATE statement.