sql - What is the difference between a stored procedure and a view? -

-

i confused few points:

  1. what difference between stored procedure , view?

  2. when should use stored procedures, , when should use views, in sql server?

  3. do views allow creation of dynamic queries can pass parameters?

  4. which 1 fastest, , on basis 1 faster other?

  5. do views or stored procedures allocate memory permanently?

  6. what mean if says views create virtual table, while procedures create materials table?

please let me know more points, if there any.

a view represents virtual table. can join multiple tables in view , use view present data if data coming single table.

a stored procedure uses parameters function... whether updating , inserting data, or returning single values or data sets.

creating views , stored procedures - has information microsoft when , why use each.

say have 2 tables:

tbl_user columns: .user_id, .user_name, .user_pw

tbl_profile columns: .profile_id, .user_id .profile_description

so if find myself querying tables alot... instead of doing join in every peice of sql define view like:

create view vw_user_profile   select a.user_id, b.profile_description   tbl_user left join tbl_profile b on a.user_id = b.user_id go

so in future if want query profile_description user id... have is

select profile_description vw_user_profile user_id = @id

that code used in stored procedure like:

create procedure dbo.getdesc  @id int begin select profile_description vw_user_profile user_id = @id end go

so later on can call 

dbo.getdesc 25

and description user id 25. 25 parameter.

there lot more detail, but, basic idea.


Comments

Post a Comment

Popular posts from this blog

c# - How to set Z index when using WPF DrawingContext? -

-
how set z-index drawing object when using drawingcontext.drawxxx() methods? the object drawn last have higher z index. can't change index of drawn objects. way draw in order. if using wpf (as placed tag), can use, example, canvas control. create shapes need like polyline obj = new polyline(); //... // ... set properties of obj and add them canvas uielementcollection: yourcanvasname.children.add(obj); //or yourcanvasname.children.insert(i, obj); first items of collection have higher z index. advantages in way: no need redraw on window changes, can anytime move objects , change order.
Read more

razor - Is this a bug in WebMatrix PageData? -

-
i think may have found bug in webmatrix's pagedata, not sure. concerns how pass data partial page calling page. in webmatrix documentation (tutorials, e.g. " 3 - creating consistent look ", , example code), pagedata recommended mechanism pass data between pages (e.g. content page layout page, or partial page). however have found not work other way, pass data partial page calling page. modifying or adding entries in pagedata in partial page, not seem calling page. cutting right down simplest possible example, in test page may have this: @{ pagedata["test"] = "initial entry"; } <p>before calling partial page, test value @pagedata["test"]</p> @renderpage("_testpartial.cshtml") <p>after returning calling page, test value @pagedata["test"]</p> and in _testpartial.cshtml page might have this: @{ pagedata["test"] = "modified entry"; } <p>in partial page...
Read more

visual c++ - Using relative values in array sorting ( asm ) -

-
i need sort through array , sort each individual row in array in ascending order. doesn't seem going (surprise!) keep getting hit 2 errors: a2101: cannot add 2 relocatable labels , a2026: constant expected here's sort, makes sense me, think i'm still trying implement high-lvl language techniqes assembly. there way around not being able use relative values? (the array 7 rows 9 columns, btw). mov cx, 7; cx = number of rows outer: ; outer loop walk through rows push cx mov cx, 9 mov row, cx ;rows middle: ; middle-loop walk through columns push cx sub cx, 1 ;cx = cx-1 mov column, cx ;columns inner: ;inner loop - compare , exchange column values cmp marray[row*9 + column], marray[row*9 + column+1] xchg marray[row*9 + column+1], marray[row*9 + column] ; compare , exchange values marray table inc column loop inner pop cx loop mid...
Read more