[英]SQL Multiple Joins Query-Query tuning
請讓我知道如何調整此查詢以獲得更好的性能/執行時間。
PS-它是由另一個人開發並交給我的。
附上查詢(我知道這是一個很大的查詢!)--
關於如何使用聚合處理連接和子查詢的任何想法都將非常有幫助。
SELECT /*+MONITOR*/ gcibjdnf.danfe,
gcibjdnf.bjd_situacao,
gcibjdnf.obs_rejeicao,
gcibjdnf.bjd_tipo_cobranca,
gcibjdnf.bjd_data_vencto_cbs,
(SELECT SUM(gcinfitens.item_valor_contratar)
FROM gcinfitens
WHERE gcinfitens.danfe = gcibjdnf.danfe) AS nf_vl_contratar,
(SELECT Max(id_contgrupo) FROM gcrcontitens WHERE gcrcontitens.danfe = gcibjdnf.danfe) AS id_contgrupo,
(SELECT MIN(nu_interv)
FROM gcrcondper
WHERE gcrcondper.id_cond = gcccond.id_cond
) AS nu_min_prz,
(SELECT MAX(nu_interv)
FROM gcrcondper
WHERE gcrcondper.id_cond = gcccond.id_cond
) AS nu_max_prz,
priper.vl_taxa AS nu_taxa,
priper.cd_tp_taxa,
priper.cd_indicador,
gcccond.nm_cond,
gcccond.cd_tp_ctr,
priper.sg_mod AS sg_mod_cond,
gcccond.dt_validade,
gcccond.cd_sit AS cd_sit_cond,
gcccond.nu_car_prz,
gcccond.cd_base_carencia,
gcccond.nu_car_desc,
apcconc.cd_loja,
apcconc.cd_concess,
apcconc.cd_conc_mat,
apcconc.nm_conc,
apcconc.nm_apelido,
apcconc.cd_tp_mercado,
dnccontrfundo.dt_emis_ctr
FROM gcibjdnf
LEFT JOIN apcconc ON TO_CHAR(apcconc.cd_sap_dealer) = gcibjdnf.dealer_sap
LEFT JOIN gcccond ON gcccond.id_cond = gcibjdnf.id_cond
LEFT JOIN dnccontrfundo ON dnccontrfundo.danfe = gcibjdnf.danfe
AND dnccontrfundo.cd_sit NOT IN ('CA','RE')
LEFT JOIN gcrcondper priper ON priper.id_cond = gcccond.id_cond
AND priper.sq_per = 1
WHERE (( apcconc.cd_concess = '1586297'
OR apcconc.cd_conc_mat = '1586297') AND gcibjdnf.bjd_situacao = 'I' AND bjd_sit_interna IN ('NO', 'SD'))
ORDER BY apcconc.nm_apelido, danfe
移動這一行:
LEFT JOIN gcccond ON gcccond.id_cond = gcibjdnf.id_cond
第一個連接:
FROM
gcibjdnf
LEFT JOIN gcccond ON gcccond.id_cond = gcibjdnf.id_cond
..................................
因為您訂購連接的方式,在這些行中:
.....................
LEFT JOIN gcrcondper gmin ON gmin.id_cond = gcccond.id_cond
LEFT JOIN gcrcondper gmax ON gmax.id_cond = gcccond.id_cond
.........................................................
您正在嘗試使用尚未在查詢中定義的表的gcccond.id_cond
列。
所以FROM
子句必須是:
FROM
gcibjdnf
LEFT JOIN gcccond ON gcccond.id_cond = gcibjdnf.id_cond
LEFT JOIN gcinfitens ON gcinfitens.danfe = gcibjdnf.danfe
LEFT JOIN gcrcontitens ON gcrcontitens.danfe = gcibjdnf.danfe
LEFT JOIN gcrcondper gmin ON gmin.id_cond = gcccond.id_cond
LEFT JOIN gcrcondper gmax ON gmax.id_cond = gcccond.id_cond
LEFT JOIN apcconc ON TO_CHAR(apcconc.cd_sap_dealer) = gcibjdnf.dealer_sap
LEFT JOIN dnccontrfundo ON dnccontrfundo.danfe = gcibjdnf.danfe
AND dnccontrfundo.cd_sit NOT IN ('CA', 'RE')
LEFT JOIN gcrcondper priper ON priper.id_cond = gcccond.id_cond
AND priper.sq_per = 1
同樣在ORDER BY
子句中,您還有不合格的列danfe
。 您必須使用表的名稱/別名對其進行限定,例如dnccontrfundo.danfe
或gcibjdnf.danfe
。
我喜歡將這樣的查詢分解成更小的部分,修復一個部分,然后添加另一部分一點一點地修復問題。
我將從 FROM 位開始:
select *
FROM gcibjdnf
LEFT JOIN apcconc
ON TO_CHAR(apcconc.cd_sap_dealer) = gcibjdnf.dealer_sap
LEFT JOIN gcccond
ON gcccond.id_cond = gcibjdnf.id_cond
LEFT JOIN dnccontrfundo
ON dnccontrfundo.danfe = gcibjdnf.danfe
AND dnccontrfundo.cd_sit NOT IN ('CA','RE')
LEFT JOIN gcrcondper priper
ON priper.id_cond = gcccond.id_cond
AND priper.sq_per = 1
WHERE (
(apcconc.cd_concess = '1586297' OR apcconc.cd_conc_mat = '1586297')
AND gcibjdnf.bjd_situacao = 'I'
AND gcibjdnf.bjd_sit_interna IN ('NO', 'SD') -- assume bjd_sit_interna is in gcibjdnf
)
您應該完全限定 bjd_sit_interna 以便每個人都知道它在哪個表中。
我創建的表只包含此處命名的列。 這部分查詢似乎“有效”,只是邏輯不一致。
接下來,我添加了 ORDER BY 子句。
ORDER BY apcconc.nm_apelido, gcibjdnf.danfe; -- danfe must be fully qualified, else ambiguous
現在在 SELECT 列表中,您沒有任何直接聚合函數; 你只能在標量子查詢中使用它們。 因此,您不需要也不能在整個查詢的末尾使用 GROUP BY!
事實上,您的查詢將按原樣運行,除了 ORDER BY 中的不明確列。
但是,您可能會得到奇怪的結果,因為 gcrcondper 上的 MIN 和 MAX 子查詢可以訪問不滿足 JOIN 條件的行。 你確定這是你想要的嗎?
除了不一致的 JOIN 邏輯和這種 MIN/MAX 怪異之外,您的查詢應該可以工作。 在談論性能之前,請檢查邏輯以確保查詢提供您想要的結果。
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