Find outdated statistics in SQL Server

SQL server uses the STATISTICS to find the appropriate Query plan.

if you are experiencing performance issues for your queries than it may be due to outdated statistics. An outdated statistic can make the sql server choose a wrong plan, use the following query to find outdated stats:

SELECT OBJECT_NAME(ID) AS [Table], SI.Name, STATS_DATE(ID, IndID) AS [Date Last Update], RowModCtr [Rows Modified Since Last Update]

FROM SYS.Tables AS ST INNER JOIN SYS.SYSIndexes AS SI ON SI.[ID] = ST.[object_ID]

INNER JOIN SYS.Schemas AS SS ON ST.[schema_ID] = SS.[Schema_ID]

WHERE STATS_DATE(ID, IndID) <= DATEADD(DAY,-1,GETDATE()) AND RowModCtr > 10

ORDER BY [RowModCtr] DESC

Once you identified the outdated stats, you can use the "Update Statistics" to do the update.

Query to find out parameters for Stored Procedure

Use below query to find out parameters for Stored Procedure

SELECT Schema_Name(Schema_ID) AS Schema_Name,
 O.Type_Desc,
 O.Name AS Object_Name, 
 P.Parameter_ID,
 P.Name AS Parameter_Name,
 Type_Name(P.User_Type_ID) AS Parameter_Type,
 P.MAX_Length,
 P.Precision,
 P.Scale,
 P.IS_Output
FROM SYS.Parameters AS P INNER JOIN SYS.Objects AS O 
ON O.Object_ID = P.Object_ID 
WHERE O.Object_ID = Object_ID('<Stored Procedure>') 
ORDER BY Schema_Name, P.Parameter_ID;

Replace <Stored Procedure> with Original Stored Procedure name.

Selecting a random number for each row

Sometime you may want to return a random number for each row. You can not do this directly selecting a RAND() function in query:

SELECT Rand() AS Random_Number, Name, Code from MyTable.

The above query will return the same random number for each row.

But you want to select different random number for each row. Follow below steps to do so:

create view rand_view
as
select rand( ) as random_value
go

create function New_rand()
returns float
as
begin
declare @f float
set @f = (select random_value from rand_view)
return @f
end

SELECT dbo.New_rand() wrapped_rand, Name, Code FROM MyTable