Purpose. REF takes as its argument a correlation variable (table alias) associated with a row of an object table or an object view. A REF value is returned for the object instance that is bound to the variable or row.
Is ref a data type in Oracle?
REF Datatype. A REF is a logical “pointer” to a row object. It is an Oracle built-in datatype.
What is ref type in PL SQL?
A ref is a pointer to a record in a SQL (i.e. database) object table. Consequently Oracle supports them in SQL but not in PL/SQL.
What is reference type in SQL?
To use a reference type in an SQL statement, use REF(t ype-name ), where type-name represents the referenced type. Db2 uses the reference type as the type of the object identifier column in typed tables. The object identifier uniquely identifies a row object in the typed table hierarchy.
Why do we use ref cursor in Oracle?
Using REF CURSOR s is one of the most powerful, flexible, and scalable ways to return query results from an Oracle Database to a client application. A REF CURSOR is a PL/SQL data type whose value is the memory address of a query work area on the database.
What is ref cursor in Oracle with example?
A REF CURSOR is a PL/SQL data type whose value is the memory address of a query work area on the database. In essence, a REF CURSOR is a pointer or a handle to a result set on the database. REF CURSOR s are represented through the OracleRefCursor ODP.NET class.
Why do we need ref cursor in Oracle?
Using REF CURSOR s is one of the most powerful, flexible, and scalable ways to return query results from an Oracle Database to a client application. In essence, a REF CURSOR is a pointer or a handle to a result set on the database.
What is difference between reference type and value type?
Main difference between value type and reference type is value type copy a data while reference types share a single copy of their data. Value Type immutable its mean when we create a instance with a value type its create a unique copy of data and it can’t change but reference type is mutable its value can be change ..
What is ref cursor in SQL?
A REF CURSOR is a PL/SQL data type whose value is the memory address of a query work area on the database. In essence, a REF CURSOR is a pointer or a handle to a result set on the database.
What is difference between cursor and ref cursor in Oracle?
A cursor is really any SQL statement that runs DML (select, insert, update, delete) on your database. A ref cursor is a pointer to a result set. This is normally used to open a query on the database server, then leave it up to the client to fetch the result it needs.
