Get Last 20 Slowest SQL Queries

 SELECT TOP 20
    SUBSTRING(qt.text, (qs.statement_start_offset/2)+1,
    ((CASE qs.statement_end_offset WHEN -1 THEN DATALENGTH(qt.text)
                                   ELSE qs.statement_end_offset
      END - qs.statement_start_offset)/2)+1),
    qs.execution_count,
    qs.total_logical_reads, qs.last_logical_reads,
    qs.min_logical_reads, qs.max_logical_reads,
    qs.total_elapsed_time, qs.last_elapsed_time,
    qs.min_elapsed_time, qs.max_elapsed_time,
    qs.last_execution_time,
    qp.query_plan
FROM
    sys.dm_exec_query_stats qs
CROSS APPLY
    sys.dm_exec_sql_text(qs.sql_handle) qt
CROSS APPLY
    sys.dm_exec_query_plan(qs.plan_handle) qp
WHERE
    qt.encrypted = 0
ORDER BY
    qs.total_logical_reads DESC

String Split in SQL

Declare @checkedItems varchar(20)

SET @checkedItems ='N,L,D,E'

Declare
@ParsedList table
(
OrderID varchar
)

DECLARE @OrderID varchar(10), @Pos int

SET @checkedItems = LTRIM(RTRIM(@checkedItems))+ ','
SET @Pos = CHARINDEX(',', @checkedItems, 1)

IF REPLACE(@checkedItems, ',', '') <> ''
BEGIN
WHILE @Pos > 0
BEGIN
SET @OrderID = LTRIM(RTRIM(LEFT(@checkedItems, @Pos - 1)))
IF @OrderID <> ''
BEGIN
INSERT INTO @ParsedList (OrderID)
VALUES (CAST(@OrderID AS varchar)) --Use Appropriate conversion
END
SET @checkedItems = RIGHT(@checkedItems, LEN(@checkedItems) - @Pos)
SET @Pos = CHARINDEX(',', @checkedItems, 1)

END
END

select * from @ParsedList

====================================
OUTPUT
====================================
OrderID
N
L
D
E