最近在忙著優化集團公司的一個報表。優化完成后，報表查詢速度由從半小時以上（甚至查不出）到秒查的質變。從修改 SQL 查詢語句邏輯到決定創建存儲過程實現，花了我 3 天多的時間，在此總結一下，希望對朋友們有幫助。

數據背景

首先項目是西門子中國在我司實施部署的 MES 項目，由于項目是在產線上運作(3 years+)，數據累積很大。

在項目的數據庫中，大概上億條數據的表有 5 個以上，千萬級數據的表 10 個以上，百萬級數據的表，很多…

（歷史問題，當初實施無人監管，無人監控數據庫這塊的性能問題。PS：我剛入職不久…）

不多說，直接貼西門子中國的開發人員在我司開發的 SSRS 報表中的 SQL 語句：

select?distinct?b.MaterialID?as?matl_def_id,?c.Descript,?case?when?right(b.MESOrderID,?12)?<?'001000000000'?then?right(b.MESOrderID,?9) else?right(b.MESOrderID,?12)?end??as?pom_order_id,?a.LotName,?a.SourceLotName?as?ComLot, e.DefID?as?ComMaterials,?e.Descript?as?ComMatDes,?d.VendorID,?d.DateCode,d.SNNote,?b.OnPlantID,a.SNCUST from (select?m.lotname,?m.sourcelotname,?m.opetypeid,?m.OperationDate,n.SNCUST?from?View1?mleft?join?co_sn_link_customer?as?n?on?n.SNMes=m.LotNamewhere(?m.LotName?in?(select?val?from?fn_String_To_Table(@sn,',',1))?or?(@sn)?=?'')?and(?m.sourcelotname?in?(select?val?from?fn_String_To_Table(@BatchID,',',1))?or?(@BatchID)?=?'')and?(n.SNCust?like?'%'+?@SN_ext?+?'%'?or?(@SN_ext)='') )?a left?join (select?*?from?Table1?where?SNType?=?'IntSN'and?SNRuleName?=?'ProductSNRule'and?OnPlantID=@OnPlant )?b?on?b.SN?=?a.LotName inner?join?MMdefinitions?as?c?on?c.DefID?=?b.MaterialID left?join??Table1?as?d?on?d.SN?=?a.SourceLotName inner?join?MMDefinitions?as?e?on?e.DefID?=?d.MaterialID where?not?exists?(select?distinct?LotName,?SourceLotName?from?ELCV_ASSEMBLE_OPS where?LotName?=?a.SourceLotName?and?SourceLotName?=?a.LotName ) and?(d.DateCode?in?(select?val?from?fn_String_To_Table(@DCode,',',1))?or?(@DCode)?=?'') and?(d.SNNote??like?'%'+@SNNote+'%'?or?(@SNNote)?=?'') and?((case?when?right(b.MESOrderID,?12)?<?'001000000000'?then?right(b.MESOrderID,?9) else?right(b.MESOrderID,?12)?end)?in?(select?val?from?fn_String_To_Table(@order_id,',',1))?or?(@order_id)?=?'') and?(e.DefID?in?(select?val?from?fn_String_To_Table(@comdef,',',1))?or?(@comdef)?=?'') --View1是一個嵌套兩層的視圖(出于保密性，實際名稱可能不同)，里面有一張上億數據的表和幾張千萬級數據的表做左連接查詢 --Table1是一個數據記錄超過1500萬的表

這個查詢語句，實際上通過我的檢測和調查，在 B/S 系統前端已無法查出結果，半小時，一小時...

因為我直接在 SQL 查詢分析器查，半小時都沒有結果。（原因是里面對一張上億級數據表和 3 張千萬級數據表做全表掃描查詢）

不由感慨，西門子中國的素質（或者說責任感）就這樣？下面說說我的分析和走的彎路（思維誤區），希望對你也有警醒。

“

推薦一個艿艿寫的 6000+ Star 的 SpringBoot + SpringCloud + Dubbo 教程的倉庫：https://github.com/YunaiV/SpringBoot-Labs

探索和誤區

首先相關表的索引，沒有建全的，把索引給建上。

索引這步完成后，發現情況還是一樣，查詢速度幾乎沒有改善。后來想起相關千萬級數據以上的表，都還沒有建立表分區。于是考慮建立表分區以及數據復制的方案。

這里有必要說明下：?我司報表用的是一個專門的數據庫服務器，數據從產線訂閱而來。就是常說的“讀寫分離”。

如果直接在原表上建立表分區，你會發現執行表分區的事物會直接死鎖。原因是：表分區操作本身會鎖表，產線還在推數據過來，這樣很容易“阻塞”，“死鎖”。

我想好的方案是：建立一個新表（空表），在新表上建好表分區，然后復制數據過來。

正打算這么干。等等！我好像進入了一個嚴重的誤區！

分析：?原 SQL 語句和業務需求，是對產線的數據做產品以及序列號的追溯，關鍵是查詢條件里沒有有規律的”條件”（如日期、編號），貿然做了表分區，在這里幾乎沒有意義！反而會降低查詢性能！

好險！還是一步一步來，先做 SQL 語句分析。

對原 SQL 語句的分析

對原 SQL 語句的分析如下：

• 查詢語句的 where 條件，有大量 @var in … or (@var =”) 的片段。

• where 條件有 like ‘%’+@var+’%’。

• where 條件有 case … end 函數。

• 多次連接同一表查詢，另外使用本身已嵌套的視圖表，是不是必須，是否可替代？

• SQL 語句有號，視圖中也有號出現。

優化設計

首先是用存儲過程改寫，好處是設計靈活。

核心思想是：?用一個或多個查詢條件（查詢條件要求至少輸入一個）得到臨時表，每個查詢條件如果查到集合，就更新這張臨時表，最后匯總的時候，只需判斷這個臨時表是否有值。

以此類推，可以建立多個臨時表，將查詢條件匯總。

這樣做目前來看至少兩點好處：

• 省去了對變量進行 =@var or (@var=”)的判斷。

• 拋棄 SQL 拼接，提高代碼可讀性。

再有就是在書寫存儲過程，這個過程中要注意：

• 盡量想辦法使用臨時表掃描替代全表掃描。

• 拋棄 in 和 not in 語句，使用 exists 和 not exists 替代。

• 和客戶確認，模糊查詢是否有必要，如沒有必要，去掉 like 語句。

• 注意建立適當的，符合場景的索引。

• 踩死 “*” 號。

• 避免在 where 條件中對字段進行函數操作。

• 對實時性要求不高的報表，允許臟讀（with(nolock)）。

“

推薦一個艿艿寫的 3000+ Star 的 SpringCloud Alibaba 電商開源項目的倉庫：https://github.com/YunaiV/onemall

存儲過程

如果想參考優化設計片段的詳細內容，請參閱 SQL 代碼：

/***?某某跟蹤報表**/ --exec?spName1?'','','','','','','公司代號' CREATE?Procedure?spName1@MESOrderID?nvarchar(320),?--工單號,最多30個@LotName?nvarchar(700),????--產品序列號,最多50個@DateCode?nvarchar(500),???--供應商批次號,最多30個@BatchID?nvarchar(700),????--組裝件序列號/物料批號,最多50個@comdef?nvarchar(700),?????--組裝件物料編碼,最多30個@SNCust?nvarchar(1600),????--外部序列號,最多50個@OnPlant?nvarchar(20)??????--平臺 AS BEGINSET?NOCOUNT?ON;/***?1)定義全局的臨時表，先根據六個查詢條件的任意一個，得出臨時表結果**/CREATE?TABLE?#FinalLotName(LotName?NVARCHAR(50),???????--序列號SourceLotName?NVARCHAR(50),?--來源序列號SNCust?NVARCHAR(128)????????--外部序列號)--1.1IF?@LotName<>''BEGINSELECT?Val?INTO?#WorkLot?FROM?fn_String_To_Table(@LotName,',',1)SELECT?LotPK,LotName?INTO?#WorkLotPK?FROM?MMLots?WITH(NOLOCK)?WHERE?EXISTS(SELECT?1?FROM?#WorkLot?b?WHERE?b.Val=MMLots.LotID)--求SourceLotPK只能在這里求SELECT?a.LotPK,a.SourceLotPK?into?#WorkSourcePK?FROM?MMLotOperations?a?WITH(NOLOCK)?WHERE?EXISTS(SELECT?1?FROM?#WorkLotPK?b?WHERE?b.LotPK=a.LotPK)?AND?a.SourceLotPK?IS?NOT?NULLSELECT?a.LotPK,a.SourceLotPK,b.LotName?INTO?#WorkSourcePK2?FROM?#WorkSourcePK?a?JOIN?#WorkLotPK?b?ON?a.LotPK=b.LotPKINSERT?INTO?#FinalLotName?SELECT?a.LotName,b.LotName?AS?SourceLotName,NULL?FROM?#WorkSourcePK2?a?JOIN?(SELECT?LotPK,LotName?FROM?MMLots?WITH(NOLOCK)?)?b?on?a.SourceLotPK=b.LotPK?--b的里面加不加WHERE?RowDeleted=0待確定SELECT?a.LotName,a.SourceLotName,b.SNCust?INTO?#FinalLotNameX1?FROM?#FinalLotName?a?LEFT?JOIN?CO_SN_LINK_CUSTOMER?b?WITH(NOLOCK)?ON?a.LotName=b.SNMesDELETE?FROM?#FinalLotNameINSERT?INTO?#FinalLotName?SELECT?LotName,SourceLotName,SNCust?FROM?#FinalLotNameX1END--1.2IF?@BatchID<>''BEGINSELECT?Val?INTO?#WorkSourceLot?FROM?fn_String_To_Table(@BatchID,',',1)IF?EXISTS(SELECT?1?FROM?#FinalLotName)--如果@LotName也不為空BEGINSELECT?a.LotName,a.SourceLotName,a.SNCust?INTO?#FinalLotNameX2?FROM?#FinalLotName?a?WHERE?EXISTS(SELECT?1?FROM?#WorkSourceLot?b?WHERE?a.SourceLotName=b.Val)DELETE?FROM?#FinalLotNameINSERT?INTO?#FinalLotName?SELECT?LotName,SourceLotName,SNCust?FROM?#FinalLotNameX2ENDELSE?--@LotName條件為空BEGINSELECT?LotPK?AS?SourceLotPK,LotName?AS?SourceLotName?INTO?#2?FROM?MMLots?WITH(NOLOCK)?WHERE?EXISTS(SELECT?1?FROM?#WorkSourceLot?b?WHERE?b.Val=MMLots.LotID)SELECT?a.LotPK,a.SourceLotPK?into?#21?FROM?MMLotOperations?a?WITH(NOLOCK)?WHERE?EXISTS(SELECT?1?FROM?#2?b?WHERE?b.SourceLotPK=a.SourceLotPK)SELECT?a.LotPK,a.SourceLotPK,b.SourceLotName?INTO?#22?FROM?#21?a?JOIN?#2?b?ON?a.SourceLotPK=b.SourceLotPKINSERT?INTO?#FinalLotName?SELECT?b.LotName,a.SourceLotName,NULL?FROM?#22?a?JOIN?(SELECT?LotPK,LotName?FROM?MMLots?WITH(NOLOCK)?)?b?on?a.LotPK=b.LotPK?--b的里面加不加WHERE?RowDeleted=0待確定SELECT?a.LotName,a.SourceLotName,b.SNCust?INTO?#FinalLotNameX21?FROM?#FinalLotName?a?LEFT?JOIN?CO_SN_LINK_CUSTOMER?b?WITH(NOLOCK)?ON?a.LotName=b.SNMesDELETE?FROM?#FinalLotNameINSERT?INTO?#FinalLotName?SELECT?LotName,SourceLotName,SNCust?FROM?#FinalLotNameX21ENDEND--1.3IF?@SNCust<>''BEGINSELECT?Val?INTO?#WorkCustomSN?FROM?fn_String_To_Table(@SNCust,',',1)IF?EXISTS(SELECT?1?FROM?#FinalLotName)--前面兩個條件至少有一個有值BEGINSELECT?a.LotName,a.SourceLotName,a.SNCust?INTO?#FinalLotNameX3?FROM?#FinalLotName?a?WHERE?EXISTS(SELECT?1?FROM?#WorkCustomSN?b?WHERE?a.SNCust=b.Val)DELETE?FROM?#FinalLotNameINSERT?INTO?#FinalLotName?SELECT?LotName,SourceLotName,SNCust?FROM?#FinalLotNameX3ENDELSEBEGINSELECT?a.SNMes?INTO?#WorkLotX?FROM?CO_SN_LINK_CUSTOMER?a?WITH(NOLOCK)?WHERE?EXISTS(SELECT?1?FROM?#WorkCustomSN?b?WHERE?a.SNCust=b.Val)-------------------以下邏輯和變量1(@LotName)類似[先根據外部序列號求解序列號,再照搬第一個判斷變量的方式]SELECT?LotPK,LotName?INTO?#WorkLotPKX?FROM?MMLots?WITH(NOLOCK)?WHERE?EXISTS(SELECT?1?FROM?#WorkLotX?b?WHERE?b.SNMes=MMLots.LotID)--求SourceLotPK只能在這里求SELECT?a.LotPK,a.SourceLotPK?into?#WorkSourcePKX?FROM?MMLotOperations?a?WITH(NOLOCK)?WHERE?EXISTS(SELECT?1?FROM?#WorkLotPKX?b?WHERE?b.LotPK=a.LotPK)?AND?a.SourceLotPK?IS?NOT?NULLSELECT?a.LotPK,a.SourceLotPK,b.LotName?INTO?#WorkSourcePK2X?FROM?#WorkSourcePKX?a?JOIN?#WorkLotPKX?b?ON?a.LotPK=b.LotPKINSERT?INTO?#FinalLotName?SELECT?a.LotName,b.LotName?AS?SourceLotName,NULL?FROM?#WorkSourcePK2X?a?JOIN?(SELECT?LotPK,LotName?FROM?MMLots?WITH(NOLOCK)?)?b?on?a.SourceLotPK=b.LotPK?--b的里面加不加WHERE?RowDeleted=0待確定SELECT?a.LotName,a.SourceLotName,b.SNCust?INTO?#FinalLotNameX31?FROM?#FinalLotName?a?LEFT?JOIN?CO_SN_LINK_CUSTOMER?b?WITH(NOLOCK)?ON?a.LotName=b.SNMesDELETE?FROM?#FinalLotNameINSERT?INTO?#FinalLotName?SELECT?LotName,SourceLotName,SNCust?FROM?#FinalLotNameX31-----------------------ENDEND/*** 2)定義全局的臨時表，用于替換第一個全局臨時表。**/CREATE?TABLE?#FinalCO_SN(SN?NVARCHAR(50),SourceSN?NVARCHAR(50),SNCust?NVARCHAR(128),matl_def_id?NVARCHAR(50),--sn的物料IDComMaterials?NVARCHAR(50),??--SourceSN的物料IDMESOrderID?NVARCHAR(20),OnPlantID?NVARCHAR(20),VendorID?NVARCHAR(20),DateCode?NVARCHAR(20)?,SNNote?NVARCHAR(512))--2.1IF?@MESOrderID<>''BEGIN-------------------------------將MESOrderID做特殊處理-----------------------------------SELECT?Val?INTO?#WorkMESOrderID?FROM?fn_String_To_Table(@MESOrderID,',',1)IF?@OnPlant='Comba'BEGINUPDATE?#WorkMESOrderID?SET?Val='C000'+Val?WHERE?LEN(Val)=9ENDELSEBEGINUPDATE?#WorkMESOrderID?SET?Val='W000'+Val?WHERE?LEN(Val)=9ENDSELECT?SN,MaterialID,MESOrderID,OnPlantID?INTO?#WorkCO_SN1?FROM?CO_SN_GENERATION?a?WITH(NOLOCK)WHERE?SNType='IntSN'?AND?SNRuleName?=?'ProductSNRule'?AND?OnPlantID=@OnPlantAND?EXISTS(SELECT?1?FROM?#WorkMESOrderID?b?WHERE?a.MESOrderID=b.Val)--------------------------------------------------------------------------------------------條件判斷(邏輯分析)開始IF?EXISTS(SELECT?1?FROM?#FinalLotName)--如果前面判斷的查詢條件有值BEGIN--查出SourceLotName對應的查詢字段SELECT?a.SN?AS?SourceLotName,a.VendorID,a.DateCode,a.SNNote,a.MaterialID?AS?ComMaterials?INTO?#SourceLotNameTable?FROM?CO_SN_GENERATION?a?WITH(NOLOCK)?WHERE?EXISTS(SELECT?1?FROM?#FinalLotName?b?WHERE?a.SN=b.SourceLotName)INSERT?INTO?#FinalCO_SNSELECT?a.LotName,a.SourceLotName,d.SNCust,b.MaterialID,c.ComMaterials,b.MESOrderID,b.OnPlantID,c.VendorID,c.DateCode,c.SNNote?FROM?#FinalLotName?aLEFT?JOIN?#WorkCO_SN1?b?ON?a.LotName=b.SNLEFT?JOIN?#SourceLotNameTable?c?ON?a.SourceLotName=c.SourceLotNameLEFT?JOIN?CO_SN_LINK_CUSTOMER?d?WITH(NOLOCK)?ON?a.LotName=d.SNMesENDELSEBEGIN--已知SN集合求解對應的SourceSN和SNCust集合------------------------------------------SELECT?LotPK,LotName?INTO?#WorkLotPK410?FROM?MMLots?WITH(NOLOCK)?WHERE?EXISTS(SELECT?1?FROM?#WorkCO_SN1?b?WHERE?b.SN=MMLots.LotID)SELECT?a.LotPK,a.SourceLotPK?into?#WorkSourcePK420?FROM?MMLotOperations?a?WITH(NOLOCK)?WHERE?EXISTS(SELECT?1?FROM?#WorkLotPK410?b?WHERE?b.LotPK=a.LotPK)?AND?a.SourceLotPK?IS?NOT?NULLSELECT?a.LotPK,a.SourceLotPK,b.LotName?INTO?#WorkSourcePK430?FROM?#WorkSourcePK420?a?JOIN?#WorkLotPK410?b?ON?a.LotPK=b.LotPKINSERT?INTO?#FinalLotName?SELECT?a.LotName,b.LotName?AS?SourceLotName,NULL?FROM?#WorkSourcePK430?a?JOIN?(SELECT?LotPK,LotName?FROM?MMLots?WITH(NOLOCK)?)?b?on?a.SourceLotPK=b.LotPK?--b的里面加不加WHERE?RowDeleted=0待確定SELECT?a.LotName,a.SourceLotName,b.SNCust?INTO?#FinalLotNameX440?FROM?#FinalLotName?a?LEFT?JOIN?CO_SN_LINK_CUSTOMER?b?WITH(NOLOCK)?ON?a.LotName=b.SNMesDELETE?FROM?#FinalLotNameINSERT?INTO?#FinalLotName?SELECT?LotName,SourceLotName,SNCust?FROM?#FinalLotNameX440-------------------------------------------------------------------------------------SELECT?a.SN?AS?SourceLotName,a.VendorID,a.DateCode,a.SNNote,a.MaterialID?AS?ComMaterials?INTO?#SourceLotNameTable2?FROM?CO_SN_GENERATION?a?WITH(NOLOCK)?WHERE?EXISTS(SELECT?1?FROM?#FinalLotName?b?WHERE?a.SN=b.SourceLotName)INSERT?INTO?#FinalCO_SNSELECT?a.LotName,a.SourceLotName,a.SNCust,b.MaterialID,c.ComMaterials,b.MESOrderID,b.OnPlantID,c.VendorID,c.DateCode,c.SNNote?FROM?#FinalLotName?aLEFT?JOIN?#WorkCO_SN1?b?ON?a.LotName=b.SNLEFT?JOIN?#SourceLotNameTable2?c?ON?a.SourceLotName=c.SourceLotNameENDEND--2.2IF?@DateCode<>''BEGINSELECT?Val?INTO?#WorkDateCode?FROM?fn_String_To_Table(@DateCode,',',1)--此@DataCode條件求解出來的是SourceSNSELECT?SN?AS?SourceSN,MaterialID?AS?ComMaterials,VendorID,DateCode,SNNote?INTO?#WorkSourceSNT1?FROM?CO_SN_GENERATION?a?WITH(NOLOCK)?WHERE?EXISTS(SELECT?1?FROM?#WorkDateCode?b?WHERE?a.DateCode=b.Val)------------------------------------------------------------------------------------------------------條件判斷(邏輯分析)開始IF?EXISTS(SELECT?1?FROM?#FinalCO_SN)--如果前面判斷的查詢條件有值BEGINSELECT?a.LotName,a.SourceLotName,a.SNCust,a.MaterialID,a.ComMaterials,a.MESOrderID,a.OnPlantID,a.VendorID,a.DateCode,a.SNNote?INTO?#TMP51?FROM?#FinalCO_SN?a?WHERE?EXISTS?(SELECT?1?FROM?#WorkDateCode?b?WHERE?a.DateCode=b.Val)DELETE?FROM?#FinalCO_SNINSERT?INTO?#FinalCO_SN?SELECT?LotName,SourceLotName,SNCust,MaterialID,ComMaterials,MESOrderID,OnPlantID,VendorID,DateCode,SNNote?FROM?#TMP51ENDELSEBEGINIF?EXISTS(SELECT?1?FROM?#FinalLotName)BEGIN--查出SourceLotName對應的查詢字段SELECT?a.SourceSN,a.VendorID,a.DateCode,a.SNNote,a.ComMaterials?INTO?#SourceLTX5?FROM?#WorkSourceSNT1?a?WHERE?EXISTS(SELECT?1?FROM?#FinalLotName?b?WHERE?a.SourceSN=b.SourceLotName)--查出SN對應的查詢字段SELECT?SN,MaterialID,MESOrderID,OnPlantID?INTO?#WorkSNT510?FROM?CO_SN_GENERATION?a?WITH(NOLOCK)WHERE?SNType='IntSN'?AND?SNRuleName?=?'ProductSNRule'?AND?OnPlantID=@OnPlantAND?EXISTS(SELECT?1?FROM?#FinalLotName?b?WHERE?a.SN=b.LotName)INSERT?INTO?#FinalCO_SNSELECT?a.LotName,a.SourceLotName,d.SNCust,b.MaterialID,c.ComMaterials,b.MESOrderID,b.OnPlantID,c.VendorID,c.DateCode,c.SNNote?FROM?#FinalLotName?aLEFT?JOIN?#WorkSNT510?b?ON?a.LotName=b.SNLEFT?JOIN?#WorkSourceSNT1?c?ON?a.SourceLotName=c.SourceSNLEFT?JOIN?CO_SN_LINK_CUSTOMER?d?WITH(NOLOCK)?ON?a.LotName=d.SNMesENDELSEBEGIN--已知SourceSN集合求解對應的SN和SNCust集合------------------------------------------SELECT?LotPK?AS?SourceLotPK,LotName?AS?SrouceLotName?INTO?#WorkLotX510?FROM?MMLots?WITH(NOLOCK)?WHERE?EXISTS(SELECT?1?FROM?#WorkSourceSNT1?b?WHERE?b.SourceSN=MMLots.LotID)SELECT?a.LotPK,a.SourceLotPK?into?#WorkLotX520?FROM?MMLotOperations?a?WITH(NOLOCK)?WHERE?EXISTS(SELECT?1?FROM?#WorkLotX510?b?WHERE?b.SourceLotPK=a.SourceLotPK)SELECT?a.LotPK,a.SourceLotPK,b.SrouceLotName?INTO?#WorkLotX530?FROM?#WorkLotX520?a?JOIN?#WorkLotX510?b?ON?a.SourceLotPK=b.SourceLotPKINSERT?INTO?#FinalLotName?SELECT?b.LotName,a.SrouceLotName,NULL?FROM?#WorkLotX530?a?JOIN?(SELECT?LotPK,LotName?FROM?MMLots?WITH(NOLOCK)?)?b?on?a.LotPK=b.LotPK?--b的里面加不加WHERE?RowDeleted=0待確定SELECT?a.LotName,a.SourceLotName,b.SNCust?INTO?#WorkLotX540?FROM?#FinalLotName?a?LEFT?JOIN?CO_SN_LINK_CUSTOMER?b?WITH(NOLOCK)?ON?a.LotName=b.SNMesDELETE?FROM?#FinalLotNameINSERT?INTO?#FinalLotName?SELECT?LotName,SourceLotName,SNCust?FROM?#WorkLotX540-------------------------------------------------------------------------------------SELECT?SN,MaterialID,MESOrderID,OnPlantID?INTO?#WorkLotX550?FROM?CO_SN_GENERATION?a?WITH(NOLOCK)WHERE?SNType='IntSN'?AND?SNRuleName?=?'ProductSNRule'?AND?OnPlantID=@OnPlantAND?EXISTS(SELECT?1?FROM?#FinalLotName?b?WHERE?a.SN=b.LotName)INSERT?INTO?#FinalCO_SNSELECT?a.LotName,a.SourceLotName,a.SNCust,b.MaterialID,c.ComMaterials,b.MESOrderID,b.OnPlantID,c.VendorID,c.DateCode,c.SNNote?FROM?#FinalLotName?aLEFT?JOIN?#WorkLotX550?b?ON?a.LotName=b.SNLEFT?JOIN?#WorkSourceSNT1?c?ON?a.SourceLotName=c.SourceSNENDENDEND--2.3IF?@comdef<>''BEGINSELECT?Val?INTO?#WorkComdef?FROM?fn_String_To_Table(@comdef,',',1)--此@comdef條件求解出來的是SourceSNSELECT?SN?AS?SourceSN,MaterialID?AS?ComMaterials,VendorID,DateCode,SNNote?INTO?#WorkSourceSNT16?FROM?CO_SN_GENERATION?a?WITH(NOLOCK)?WHERE?EXISTS(SELECT?1?FROM?#WorkComdef?b?WHERE?a.MaterialID=b.Val)------------------------------------------------------------------------------------------------------條件判斷(邏輯分析)開始IF?EXISTS(SELECT?1?FROM?#FinalCO_SN)--如果前面判斷的查詢條件有值BEGINSELECT?a.LotName,a.SourceLotName,a.SNCust,a.MaterialID,a.ComMaterials,a.MESOrderID,a.OnPlantID,a.VendorID,a.DateCode,a.SNNote?INTO?#TMP516?FROM?#FinalCO_SN?a?WHERE?EXISTS?(SELECT?1?FROM?#WorkComdef?b?WHERE?a.matl_def_id=b.Val)DELETE?FROM?#FinalCO_SNINSERT?INTO?#FinalCO_SN?SELECT?LotName,SourceLotName,SNCust,MaterialID,ComMaterials,MESOrderID,OnPlantID,VendorID,DateCode,SNNote?FROM?#TMP516ENDELSEBEGINIF?EXISTS(SELECT?1?FROM?#FinalLotName)BEGIN--查出SourceLotName對應的查詢字段SELECT?a.SourceSN,a.VendorID,a.DateCode,a.SNNote,a.ComMaterials?INTO?#SourceLTX56?FROM?#WorkSourceSNT16?a?WHERE?EXISTS(SELECT?1?FROM?#FinalLotName?b?WHERE?a.SourceSN=b.SourceLotName)--查出SN對應的查詢字段SELECT?SN,MaterialID,MESOrderID,OnPlantID?INTO?#WorkSNT5106?FROM?CO_SN_GENERATION?a?WITH(NOLOCK)WHERE?SNType='IntSN'?AND?SNRuleName?=?'ProductSNRule'?AND?OnPlantID=@OnPlantAND?EXISTS(SELECT?1?FROM?#FinalLotName?b?WHERE?a.SN=b.LotName)INSERT?INTO?#FinalCO_SNSELECT?a.LotName,a.SourceLotName,d.SNCust,b.MaterialID,c.ComMaterials,b.MESOrderID,b.OnPlantID,c.VendorID,c.DateCode,c.SNNote?FROM?#FinalLotName?aLEFT?JOIN?#WorkSNT5106?b?ON?a.LotName=b.SNLEFT?JOIN?#WorkSourceSNT16?c?ON?a.SourceLotName=c.SourceSNLEFT?JOIN?CO_SN_LINK_CUSTOMER?d?WITH(NOLOCK)?ON?a.LotName=d.SNMesENDELSEBEGIN--已知SourceSN集合求解對應的SN和SNCust集合------------------------------------------SELECT?LotPK?AS?SourceLotPK,LotName?AS?SrouceLotName?INTO?#WorkLotX5106?FROM?MMLots?WITH(NOLOCK)?WHERE?EXISTS(SELECT?1?FROM?#WorkSourceSNT16?b?WHERE?b.SourceSN=MMLots.LotID)SELECT?a.LotPK,a.SourceLotPK?into?#WorkLotX5206?FROM?MMLotOperations?a?WITH(NOLOCK)?WHERE?EXISTS(SELECT?1?FROM?#WorkLotX5106?b?WHERE?b.SourceLotPK=a.SourceLotPK)SELECT?a.LotPK,a.SourceLotPK,b.SrouceLotName?INTO?#WorkLotX5306?FROM?#WorkLotX5206?a?JOIN?#WorkLotX5106?b?ON?a.SourceLotPK=b.SourceLotPKINSERT?INTO?#FinalLotName?SELECT?b.LotName,a.SrouceLotName,NULL?FROM?#WorkLotX5306?a?JOIN?(SELECT?LotPK,LotName?FROM?MMLots?WITH(NOLOCK)?)?b?on?a.LotPK=b.LotPK?--b的里面加不加WHERE?RowDeleted=0待確定SELECT?a.LotName,a.SourceLotName,b.SNCust?INTO?#WorkLotX5406?FROM?#FinalLotName?a?LEFT?JOIN?CO_SN_LINK_CUSTOMER?b?WITH(NOLOCK)?ON?a.LotName=b.SNMesDELETE?FROM?#FinalLotNameINSERT?INTO?#FinalLotName?SELECT?LotName,SourceLotName,SNCust?FROM?#WorkLotX5406-------------------------------------------------------------------------------------SELECT?SN,MaterialID,MESOrderID,OnPlantID?INTO?#WorkLotX5506?FROM?CO_SN_GENERATION?a?WITH(NOLOCK)WHERE?SNType='IntSN'?AND?SNRuleName?=?'ProductSNRule'?AND?OnPlantID=@OnPlantAND?EXISTS(SELECT?1?FROM?#FinalLotName?b?WHERE?a.SN=b.LotName)INSERT?INTO?#FinalCO_SNSELECT?a.LotName,a.SourceLotName,a.SNCust,b.MaterialID,c.ComMaterials,b.MESOrderID,b.OnPlantID,c.VendorID,c.DateCode,c.SNNote?FROM?#FinalLotName?aLEFT?JOIN?#WorkLotX5506?b?ON?a.LotName=b.SNLEFT?JOIN?#WorkSourceSNT16?c?ON?a.SourceLotName=c.SourceSNENDENDEND/***?3)條件判斷結束**/IF?EXISTS(SELECT?1?FROM?#FinalLotName)BEGINIF?EXISTS(SELECT?1?FROM?#FinalCO_SN)BEGIN--3.1SELECT?a.matl_def_id,b.Descript,a.MESOrderID?AS?pom_order_id,a.SN?AS?LotName,a.SourceSN?AS?ComLot,a.ComMaterials,c.Descript?AS?ComMatDes,a.VendorID,a.DateCode,a.SNNote,OnPlantID,SNCust?FROM?#FinalCO_SN?aJOIN?MMDefinitions?b?WITH(NOLOCK)?ON?a.matl_def_id=b.DefIDJOIN?MMDefinitions?c?WITH(NOLOCK)?ON?a.ComMaterials=c.DefIDWHERE?NOT?EXISTS(select?distinct?SN,?SourceSN?from?#FinalCO_SN?xwhere?x.SN?=?a.SourceSN?and?x.SourceSN?=?a.SN)ENDELSEBEGIN--3.2--3.2.1求解SN的必查字段SELECT?SN,MaterialID,MESOrderID,OnPlantID?INTO?#FinalSNX1?FROM?CO_SN_GENERATION?a?WITH(NOLOCK)WHERE?SNType='IntSN'?AND?SNRuleName?=?'ProductSNRule'?AND?OnPlantID=@OnPlantAND?EXISTS(SELECT?1?FROM?#FinalLotName?b?WHERE?a.SN=b.LotName)--3.2.2求解SourceSN的必查字段SELECT?a.SN?AS?SourceLotName,a.VendorID,a.DateCode,a.SNNote,a.MaterialID?AS?ComMaterials?INTO?#FinalSNX2?FROM?CO_SN_GENERATION?a?WITH(NOLOCK)?WHERE?EXISTS(SELECT?1?FROM?#FinalLotName?b?WHERE?a.SN=b.SourceLotName)SELECT?b.MaterialID?AS?matl_def_id,x.Descript,b.MESOrderID?AS?pom_order_id,b.SN?AS?LotName,c.SourceLotName?AS?ComLot,c.ComMaterials,y.Descript?AS?ComMatDes,c.VendorID,c.DateCode,c.SNNote,b.OnPlantID,a.SNCustFROM?#FinalLotName?aLEFT?JOIN?#FinalSNX1?b?ON?a.LotName=b.SNLEFT?JOIN?#FinalSNX2?c?ON?a.SourceLotName=c.SourceLotNameJOIN?MMDefinitions?x?WITH(NOLOCK)?ON?b.MaterialID=x.DefIDJOIN?MMDefinitions?y?WITH(NOLOCK)?ON?c.ComMaterials=y.DefIDWHERE?NOT?EXISTS(SELECT?DISTINCT?*?FROM?#FinalLotName?zWHERE?z.LotName=a.SourceLotName?and?z.SourceLotName=a.LotName)ENDENDELSEBEGINIF?EXISTS(SELECT?1?FROM?#FinalCO_SN)BEGIN--3.3SELECT?a.matl_def_id,b.Descript,a.MESOrderID?AS?pom_order_id,a.SN?AS?LotName,a.SourceSN?AS?ComLot,a.ComMaterials,c.Descript?AS?ComMatDes,a.VendorID,a.DateCode,a.SNNote,OnPlantID,SNCust?FROM?#FinalCO_SN?aJOIN?MMDefinitions?b?WITH(NOLOCK)?ON?a.matl_def_id=b.DefIDJOIN?MMDefinitions?c?WITH(NOLOCK)?ON?a.ComMaterials=c.DefIDWHERE?NOT?EXISTS(select?distinct?SN,?SourceSN?from?#FinalCO_SN?xwhere?x.SN?=?a.SourceSN?and?x.SourceSN?=?a.SN)ENDELSEBEGIN--3.4PRINT?'There?is?no?queryable?condition,please?enter?at?less?a?query?conditon.'ENDENDEND GO

雖然犧牲了代碼的可讀性，但創造了性能價值。本人水平有限，還請各位不吝賜教！

最后，將 SSRS 報表替換成此存儲過程后，SQL 查詢分析器是秒查的。B/S 前端用時 1~2 秒！

總結

平常的你是否偶爾會因急于完成任務而書寫一堆性能極低的 SQL 語句呢？寫出可靠性能的 SQL 語句不難，難的是習慣。

本文的優化思想很簡單，關鍵點是避免全表掃描&注重 SQL 語句寫法&索引。

另外，如果你查詢的表有可能會在查詢時段更新，而實際業務需求允許臟讀，可加 with（nolock）預防查詢被更新事物阻塞。

總結

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