In this chapter, we will discuss the cursors in PL/SQL. A cursor holds the rows (one or more) returned by a SQL statement.
A cursor contains information on a select statement and the rows of data accessed by it.
This temporary work area is used to store the data retrieved from the database, and manipulate this data.
) instead of a list of fields if you want to access all fields from the input table (raster and BLOB fields are excluded).
However, for faster performance and reliable field order, it is recommended that the list of fields be narrowed to only those that are actually needed. Additional information can be accessed using tokens (such as .
A cursor can hold more than one row, but can process only one row at a time.
The set of rows the cursor holds is called the set.Else we get a message like for example, 'Salaries for 1000 employees are updated' if there are 1000 rows in ‘employee’ table.statement, but I don't see how that can fit into my current code. I want to allow a calling program to update a row in the cursor (I want to update the race location) returned by the query in my current code.An SQL postfix clause is positioned in the second position and will be appended to the SELECT statement, following the where clause.The SQL postfix clause is most commonly used for clauses such as ORDER BY. The order of values should be in the same order as the fields.An SQL prefix clause is positioned in the first position and will be inserted between the SELECT keyword and the SELECT COLUMN LIST.