Which are the attributes of implicit cursor?
An implicit cursor has attributes that return information about the most recently run SELECT or DML statement that is not associated with a named cursor. Note: You can use cursor attributes only in procedural statements, not in SQL statements. SQL%ISOPEN always has the value FALSE .
What is cursor in Oracle SQL?
A cursor is a pointer to this context area. PL/SQL controls the context area through a cursor. A cursor holds the rows (one or more) returned by a SQL statement. The set of rows the cursor holds is referred to as the active set.
What are cursor attributes in Oracle?
Every explicit cursor and cursor variable has four attributes: %FOUND , %ISOPEN %NOTFOUND , and %ROWCOUNT . When appended to the cursor or cursor variable, these attributes return useful information about the execution of a data manipulation statement.
Why cursor is used in SQL?
In SQL procedures, a cursor make it possible to define a result set (a set of data rows) and perform complex logic on a row by row basis. By using the same mechanics, an SQL procedure can also define a result set and return it directly to the caller of the SQL procedure or to a client application.
What are the attributes of implicit cursor in PL SQL?
Implicit Cursor Attributes
| Cursor Attribute | Cursor Variable |
|---|---|
| %ISOPEN | SQL%ISOPEN |
| %FOUND | SQL%FOUND |
| %NOTFOUND | SQL%NOTFOUND |
| %ROWCOUNT | SQL%ROWCOUNT |
What is the advantage of cursor in SQL?
Cursors can be faster than a while loop but they do have more overhead. It is we can do RowWise validation or in other way you can perform operation on each Row. It is a Data Type which is used to define multi-value variable. Cursors can be faster than a while loop but at the cost of more overhead.
What does cursor do in SQL?
A cursor in SQL is a temporary work area created in system memory when a SQL statement is executed. A SQL cursor is a set of rows together with a pointer that identifies a current row. It is a database object to retrieve data from a result set one row at a time.
What is cursor in SQL w3schools?
A SQL cursor is a database object that retrieves data from result sets one row at a time. The cursor in SQL can be used when the data needs to be updated row by row. A SQL cursor is a database object that is used to retrieve data from a result set one row at a time. This article explains everything about SQL cursors.
What is a cursor in Oracle 11g?
Introduction to Oracle 11g Cursors. Cursors are one of the most common and fundamental terms in the database terminology. It is one of the core database programming concepts, which forms a basic unit of execution of SQL statement. A cursor is a pointer, which points towards a pre allocated memory location in the SGA.
Is the implicit cursor attribute true in SQL?
Implicit Cursor Attribute. An implicit cursor has attributes that return information about the most recently run SELECT or DML statement that is not associated with a named cursor. SQL%ISOPEN always has the value FALSE.
When does the cursor return true in SQL?
Afterward, it returns TRUE if the last fetch returned a row, or FALSE if the last fetch failed to return a row. A cursor variable declared in a PL/SQL host environment and passed to PL/SQL as a bind variable. The datatype of the host cursor variable is compatible with the return type of any PL/SQL cursor variable.
What are the attributes of the cursor variable?
Every explicit cursor and cursor variable has four attributes: %FOUND, %ISOPEN %NOTFOUND, and %ROWCOUNT. When appended to the cursor or cursor variable, these attributes return useful information about the execution of a data manipulation statement. For more information, see “Using Cursor Expressions”.