How to display no Data message in Stored procedre - sql-server

Question

If #MeasureRuleTrendId value has no data i need to display either empty table or No Data message.. Can you please help what we need to add in the below code... Thanks in Advance
ALTER PROCEDURE [dbo].[uspRptDQMeasureDetail] (#MeasureRuleTrendId INT)
AS
BEGIN
SET NOCOUNT ON
truncate table dq.tt
IF OBJECT_ID('tempdb..#columns') IS NOT NULL
DROP TABLE #columns
IF OBJECT_ID('tempdb..##Tmp') IS NOT NULL
DROP TABLE ##Tmp
CREATE TABLE #Columns (
Id INT IDENTITY
,Col VARCHAR(500)
)
DECLARE #RowsToProcess AS INT
DECLARE #CurrentRow AS INT
DECLARE #SQL AS VARCHAR(MAX)
DECLARE #xml AS XML
DECLARE #Col AS VARCHAR(100)
DECLARE #SQLUnpivot AS VARCHAR(MAX)
DECLARE #SQLTempTable AS VARCHAR(MAX)
SELECT #xml = DetailCSV
FROM DQ.MeasureRuleDtl
WHERE [MeasureRuleTrendId] = #MeasureRuleTrendId
SET #SQL = 'DECLARE #xml AS XML; SELECT #xml = DetailCSV
FROM DQ.MeasureRuleDtl where[MeasureRuleTrendId] = ' + Convert(VARCHAR(100), #MeasureRuleTrendId) + '; INSERT INTO ##Tmp Select '
SET #SQLUnpivot = 'SELECT ID, ColName, VAL FROM (SELECT * from ##Tmp ) p UNPIVOT (VAL FOR ColName IN ('
SET #SQLTempTable = ''
SET #SQLTempTable = 'CREATE Table ##Tmp ( ID INT Identity ,'
INSERT INTO #Columns (col)
SELECT DISTINCT C.value('local-name(.)', 'varchar(50)') AS NodeName
FROM #xml.nodes('/row/*') AS T(C)
SET #RowsToProcess = ##ROWCOUNT
SET #CurrentRow = 0
WHILE #CurrentRow < #RowsToProcess
BEGIN
SET #CurrentRow = #CurrentRow + 1
SELECT #Col = Col
FROM #Columns
WHERE ID = #CurrentRow
SET #sql = #SQL + #col + ' = Events.value(' + '''' + '(' + #col + ')[1]' + '''' + ',' + '''' + 'varchar(max)' + '''' + ')'
SET #SQLTempTable = #SQLTempTable + #Col + ' VARCHAR(max)'
SET #SQLUnpivot = #SQLUnpivot + #Col
IF #CurrentRow = #RowsToProcess
BEGIN
SET #sql = #sql + ' '
SET #SQLTempTable = #SQLTempTable + ' '
SET #SQLUnpivot = #SQLUnpivot + ' '
END
ELSE
BEGIN
SET #sql = #sql + ' , '
SET #SQLTempTable = #SQLTempTable + ' , '
SET #SQLUnpivot = #SQLUnpivot + ' , '
END
END
SET #SQL = #sql + + ' FROM #xml.nodes(''/row'') AS XTbl(Events)'
SET #SQLUnpivot = #SQLUnpivot + '))AS unpvt'
set #SQLUnpivot = 'insert into dq.tt ' + #SQLUnpivot
SET #SQLTempTable = #SQLTempTable + ')'
EXECUTE (#SQLTempTable)
EXECUTE (#SQL)
Print #sqlunpivot
EXECUTE (#SQLUnpivot)
SELECT * from dq.tt
SET NOCOUNT OFF
END

Answer 1

It should be enough to add this in your final WHERE, if this is a question of performance, you could add the WHERE to your dynamic SQL too:
ALTER PROCEDURE [dbo].[uspRptDQMeasureDetail] (#MeasureRuleTrendId INT)
AS
BEGIN
SET NOCOUNT ON
truncate table dq.tt
IF OBJECT_ID('tempdb..#columns') IS NOT NULL
DROP TABLE #columns
IF OBJECT_ID('tempdb..##Tmp') IS NOT NULL
DROP TABLE ##Tmp
CREATE TABLE #Columns (
Id INT IDENTITY
,Col VARCHAR(500)
)
DECLARE #RowsToProcess AS INT
DECLARE #CurrentRow AS INT
DECLARE #SQL AS VARCHAR(MAX)
DECLARE #xml AS XML
DECLARE #Col AS VARCHAR(100)
DECLARE #SQLUnpivot AS VARCHAR(MAX)
DECLARE #SQLTempTable AS VARCHAR(MAX)
SELECT #xml = DetailCSV
FROM DQ.MeasureRuleDtl
WHERE [MeasureRuleTrendId] = #MeasureRuleTrendId
SET #SQL = 'DECLARE #xml AS XML; SELECT #xml = DetailCSV
FROM DQ.MeasureRuleDtl where[MeasureRuleTrendId] = ' + Convert(VARCHAR(100), #MeasureRuleTrendId) + '; INSERT INTO ##Tmp Select '
SET #SQLUnpivot = 'SELECT ID, ColName, VAL FROM (SELECT * from ##Tmp ) p UNPIVOT (VAL FOR ColName IN ('
SET #SQLTempTable = ''
SET #SQLTempTable = 'CREATE Table ##Tmp ( ID INT Identity ,'
INSERT INTO #Columns (col)
SELECT DISTINCT C.value('local-name(.)', 'varchar(50)') AS NodeName
FROM #xml.nodes('/row/*') AS T(C)
SET #RowsToProcess = ##ROWCOUNT
SET #CurrentRow = 0
WHILE #CurrentRow < #RowsToProcess
BEGIN
SET #CurrentRow = #CurrentRow + 1
SELECT #Col = Col
FROM #Columns
WHERE ID = #CurrentRow
SET #sql = #SQL + #col + ' = Events.value(' + '''' + '(' + #col + ')[1]' + '''' + ',' + '''' + 'varchar(max)' + '''' + ')'
SET #SQLTempTable = #SQLTempTable + #Col + ' VARCHAR(max)'
SET #SQLUnpivot = #SQLUnpivot + #Col
IF #CurrentRow = #RowsToProcess
BEGIN
SET #sql = #sql + ' '
SET #SQLTempTable = #SQLTempTable + ' '
SET #SQLUnpivot = #SQLUnpivot + ' '
END
ELSE
BEGIN
SET #sql = #sql + ' , '
SET #SQLTempTable = #SQLTempTable + ' , '
SET #SQLUnpivot = #SQLUnpivot + ' , '
END
END
SET #SQL = #sql + + ' FROM #xml.nodes(''/row'') AS XTbl(Events)'
SET #SQLUnpivot = #SQLUnpivot + '))AS unpvt'
set #SQLUnpivot = 'insert into dq.tt ' + #SQLUnpivot
SET #SQLTempTable = #SQLTempTable + ')'
EXECUTE (#SQLTempTable)
EXECUTE (#SQL)
Print #sqlunpivot
EXECUTE (#SQLUnpivot)
--Added your parameter with WHERE...
SELECT * from dq.tt WHERE #MeasureRuleTrendId IS NOT NULL
SET NOCOUNT OFF
END