Menu
What is the difference between v() and nv() functions in oracle apex?
I came across the nv() function and the only thing I can get google to spit out is the nvl() function.
apex_custom_auth.post_login(
p_uname => l_authenticated_username,
p_session_id => nv('APP_SESSION'),
p_app_page =>
apex_application.g_flow_id||':'||nvl(apex_application.g_flow_step_id,0));
235
V$SQL lists statistics on shared SQL areas without the GROUP BY clause and contains one row for each child of the original SQL text entered. Statistics displayed in V$SQL are normally updated at the end of query execution. However, for long running queries, they are updated every 5 seconds.
NVL2 lets you determine the value returned by a query based on whether a specified expression is null or not null. If expr1 is not null, then NVL2 returns expr2 . If expr1 is null, then NVL2 returns expr3 . The argument expr1 can have any datatype.
NVL and COALESCE are used to achieve the same functionality of providing a default value in case the column returns a NULL. The differences are: NVL accepts only 2 arguments whereas COALESCE can take multiple arguments. NVL evaluates both the arguments and COALESCE stops at first occurrence of a non-Null value.
Description The varray (variable size array) is one of the three types of collections in PL/SQL (associative array, nested table, varray). The varray's key distinguishing feature is that when you declare a varray type, you specify the maximum number of elements that can be defined in the varray.
nv returns a number rather than a string (so obviously it only works with numeric attributes). If you use v to return numeric values, you can sometimes run into performance issues related to data type conversion.
See Syntax for referencing item values
113
It is
GET_NUMERIC_SESSION_STATE Function
This function returns a numeric value for a numeric item. You can use this function in Oracle Application Express applications wherever you can use PL/SQL or SQL. You can also use the shorthand, function NV, in place of APEX_UTIL.GET_NUMERIC_SESSION_STATE.
See Oracle Application Express APIs for more info.
28
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With
