Start Discovering Solved Questions and Your Course Assignments
TextBooks Included
Solved Assignments
Asked Questions
Answered Questions
using a host variableyou can declare the cursor variable in the plsql host environment like an oci or pro c program to use the cursor variable you
opening a cursor variablethe open-for statement relates a cursor variable with the multi-row query executes the query and then identifies the result
controlling cursor variablesyou use 3 statements to control the cursor variable open-for fetch amp close at first you open a cursor variable for a
cursor variables as parametersyou can declare the cursor variables as the formal parameters of the functions and procedures in the illustration below
declaring cursor variablesonce a ref cursor type is define by you and then you can declare the cursor variables of that type in any plsql block or
defining ref cursor typesto make cursor variables you take 2 steps at first you define a ref cursor type and then declare the cursor variables of
why use cursor variables primarily you use the cursor variables to pass the query result sets between the plsql stored subprograms and different
what are cursor variables the cursor variables are like c or pascal pointers that hold the memory location address of some item rather of the item
packaging cursors you can split a cursor specification from its body for placement in a package in that way you can change the cursor body without
implicit cursorsthe oracle implicitly opens a cursor to process each sql statement not related with an explicitly declared cursor the plsql lets you
using subqueriesa subquery is a query typically enclosed by parentheses that appears within another sql data manipulation statement if evaluated the
closing a cursorthe close statements disable the cursor and the result set becomes undefined an illustration of the close statement as shownclose
fetching with a cursorthe fetch statements retrieve the rows in the result set one at a time after each and every fetch the cursor advance to the
passing cursor parametersyou use the open statement to pass the parameters to a cursor unless you want to accept the default values each proper
opening a cursoropening the cursor executes the query amp identifies the result set that consists of all rows that meet the query search criteria for
declaring a cursorthe forward references are not allowed in the plsql therefore you must declare a cursor before referencing it in other statements
explicit cursorsthe set of rows returned by the query can include zero one or multiple rows depending on how many rows meet your search criteria
managing cursorsthe plsql uses 2 types of cursors implicit and explicit the plsql declares a cursor implicitly for all the sql data manipulation
row operatorsthe row operators return or reference the particular rows all retains the duplicate rows in the result of a query or in an aggregate
set operatorsthe set operators combine the results of the two queries into one result the intersect returns all the distinct rows selected by both
sql operatorsthe plsql uses all the sql set comparison and row operators in the sql statements this part briefly describes some of these
rownumthe rownum returns a number representing the order in which a row was selected from the table the first row selected has a rownum of 1 the
rowidthe rowid returns the rowid binary address of a row in the database table you can use the variables of the type urowid to store rowids in a
levelyou use the level with the select connect by statement to categorize rows from a database table into a tree structure the level returns the