How do you return a cursor in Oracle?
How do you return a cursor in Oracle?
CREATE OR REPLACE FUNCTION get_allitems RETURN SYS_REFCURSOR AS my_cursor SYS_REFCURSOR; BEGIN OPEN my_cursor FOR SELECT * FROM allitems; RETURN my_cursor; END get_allitems; This will return the cursor. Make sure not to put your SELECT -String into quotes in PL/SQL when possible.
Can we return table from function in Oracle?
With collections and the table() function, a function can return a table that can be queried in an SQL statement.
Can function return null value in Oracle?
A function can return null. Several Oracle functions return null in some situations. The function must return something (even null, but a RETURN statement must be executed).
How do I declare a Rowtype variable in PL SQL?
Declaring variables as the type table_name %ROWTYPE is a convenient way to transfer data between database tables and PL/SQL. You create a single variable rather than a separate variable for each column. You do not need to know the name of every column.
Can a function return a table?
The simple definition of the table-valued function (TVF) can be made such like that; a user-defined function that returns a table data type and also it can accept parameters. TVFs can be used after the FROM clause in the SELECT statements so that we can use them just like a table in the queries.
Can Plsql function return multiple values?
But we can use OUT parameter to return multiple value from a procedure. Similarly we can also return multiple value from a function by using TABLE type object. We can also say that collection type object can be made as TABLE type object in oracle plsql.
Are two null values equal?
Because null represents a lack of data, a null cannot be equal or unequal to any value or to another null. However, Oracle considers two nulls to be equal when evaluating a DECODE function.
Is null equal to null in Oracle?
One of the most mindboggling values in the Oracle database is the NULL value. NULL is not even the same as NULL. NULL is undefined. But you need to work with NULL values (which are no actual values).
What is the difference between %type and %Rowtype?
%TYPE : Used to declare a field with the same type as that of a specified table’s column. %ROWTYPE: Used to declare a record with the same types as found in the specified table, view or cursor (= multiple columns).
What is type and Rowtype in Plsql?
The %ROWTYPE attribute, used to declare PL/SQL variables of type record with fields that correspond to the columns of a table or view, is supported by the data server. Each field in a PL/SQL record assumes the data type of the corresponding column in the table. A record is a named, ordered collection of fields.
How does the NVL function in Oracle work?
In Oracle, NVL(exp1, exp2) function accepts 2 expressions (parameters), and returns the first expression if it is not NULL, otherwise NVL returns the second expression.
When does the NVL ( ) function return E1?
If e1 evaluates to non-null, the NVL () function returns e1. The two arguments e1 and e2 can have the same or different data types. If their data types are different, Oracle implicit converts one to the other according to the following rules:
What is the syntax of the NVL ( ) function?
The following shows the syntax of the NVL () function: The NVL () function accepts two arguments. If e1 evaluates to null, then NVL () function returns e2. If e1 evaluates to non-null, the NVL () function returns e1. The two arguments e1 and e2 can have the same or different data types.
How to replace null with a string in NVL?
NVL lets you replace null (returned as a blank) with a string in the results of a query. If expr1 is null, then NVL returns expr2. If expr1 is not null, then NVL returns expr1. The arguments expr1 and expr2 can have any datatype.
How do you return a cursor in Oracle? CREATE OR REPLACE FUNCTION get_allitems RETURN SYS_REFCURSOR AS my_cursor SYS_REFCURSOR; BEGIN OPEN my_cursor FOR SELECT * FROM allitems; RETURN my_cursor; END get_allitems; This will return the cursor. Make sure not to put your SELECT -String into quotes in PL/SQL when possible. Can we return table from function…