What is the Difference?
Hello All,
I had a select statement like this.
OPTION 1:
SELECT
vbak~kunnr
vbak~vbeln
vbak~ernam
vbak~autlf
vbak~lifsk
vbap~posnr AS posnv
vbap~posnr AS posnn
vbap~matnr
vbap~pstyv
vbap~prodh
vbap~werks
vbap~abgru
vbap~fixmg
vbap~kwmeng
vbuk~gbstk
INTO TABLE g_t_nso_sales
FROM vbak
INNER JOIN vbap
ON vbakvbeln = vbapvbeln "AND
INNER JOIN vbuk
ON vbakvbeln = vbukvbeln
WHERE vbak~kunnr IN s_kunnr AND
vbak~vbeln IN s_vbeln AND
vbak~auart = v_auart AND
vbak~vkorg = v_vkorg AND
vbak~ernam IN r_uname AND
vbak~audat IN s_audat AND
vbap~vbeln in s_vbeln AND
vbap~pstyv IN s_pstyv AND
vbap~werks IN s_werks AND
vbuk~vbeln in s_vbeln and
vbuk~gbstk IN r_gbstk.
we had issues with this select in terms of performance.
it was changed to following.
SELECT vbak~kunnr
vbak~vbeln
vbak~ernam
vbakautlf vbaklifsk vbap~posnr AS posnv
vbap~posnr AS posnn
vbap~matnr
vbap~pstyv
vbap~prodh
vbap~werks
vbap~abgru
vbap~fixmg
vbap~kwmeng
vbuk~gbstk
vbak~bstnk
INTO TABLE g_t_nso_sales
FROM vbak
INNER JOIN vbap
ON vbakvbeln = vbapvbeln "AND
INNER JOIN vbuk
ON vbakvbeln = vbukvbeln
WHERE vbak~kunnr IN s_kunnr AND
vbak~vbeln IN s_vbeln AND
vbak~auart = v_auart AND
vbak~vkorg = v_vkorg AND
vbak~ernam IN r_uname AND
vbak~audat IN s_audat AND
vbak~bstnk IN s_bstkd AND
vbap~pstyv IN s_pstyv AND
vbuk~gbstk IN r_gbstk.
As you can see the only difference is removing ,
vbuk~vbeln in s_vbeln
vbap~vbeln in s_vbeln from where conditions.
It has improved performance, but at the cost of not fectghing few records.
Query 1 fetched 5K records, where later picked only 3,500
records.
I count really understand the difference in queries.
am sure am missing something ova here, can some pl help me to understand this.
Rgds,
รถ
