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最近在忙著優(yōu)化集團公司的一個報表。優(yōu)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(zhì)變。從修改 SQL 查詢語句邏輯到?jīng)Q定創(chuàng)建存儲過程實現(xiàn)，花了我 3 天多的時間，在此總結(jié)一下，希望對朋友們有幫助。

數(shù)據(jù)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(chǎn)線上運作(3 years+)，數(shù)據(jù)累積很大。

在項目的數(shù)據(jù)庫中，大概上億條數(shù)據(jù)的表有 5 個以上，千萬級數(shù)據(jù)的表 10 個以上，百萬級數(shù)據(jù)的表，很多…

（歷史問題，當(dāng)初實施無人監(jiān)管，無人監(jiān)控數(shù)據(jù)庫這塊的性能問題。PS：我剛?cè)肼毑痪谩?/span>

不多說，直接貼西門子中國的開發(fā)人員在我司開發(fā)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?m
????left?join?co_sn_link_customer?as?n?on?n.SNMes=m.LotName
????where?
????(?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(shù)據(jù)的表和幾張千萬級數(shù)據(jù)的表做左連接查詢
--Table1是一個數(shù)據(jù)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(diào)查，在 B/S 系統(tǒng)前端已無法查出結(jié)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(jié)果。（原因是里面對一張上億級數(shù)據(jù)表和 3 張千萬級數(shù)據(jù)表做全表掃描查詢）

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

探索和誤區(qū)

首先相關(guān)表的索引，沒有建全的，把索引給建上。

索引這步完成后，發(fā)現(xiàn)情況還是一樣，查詢速度幾乎沒有改善。后來想起相關(guān)千萬級數(shù)據(jù)以上的表，都還沒有建立表分區(qū)。于是考慮建立表分區(qū)以及數(shù)據(jù)復(fù)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(shù)據(jù)庫服務(wù)器，數(shù)據(jù)從產(chǎn)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(qū)，你會發(fā)現(xiàn)執(zhí)行表分區(qū)的事物會直接死鎖。原因是：表分區(qū)操作本身會鎖表，產(chǎn)線還在推數(shù)據(jù)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(qū)，然后復(fù)制數(shù)據(jù)過來。

正打算這么干。等等！我好像進入了一個嚴(yán)重的誤區(qū)！

分析：原 SQL 語句和業(yè)務(wù)需求，是對產(chǎn)線的數(shù)據(jù)做產(chǎn)品以及序列號的追溯，關(guān)鍵是查詢條件里沒有有規(guī)律的”條件”（如日期、編號），貿(mào)然做了表分區(qū)，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(shù)。
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(xiàn)。

優(yōu)化設(shè)計

首先是用存儲過程改寫，好處是設(shè)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(rèn)，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(dāng)?shù)?，符合場景的索引?/span>
踩死 “*” 號。
避免在 where 條件中對字段進行函數(shù)操作。
對實時性要求不高的報表，允許臟讀（with(nolock)）。

存儲過程

如果想?yún)⒖純?yōu)化設(shè)計片段的詳細內(nèi)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(chǎn)品序列號,最多50個
???@DateCode?nvarchar(500),???--供應(yīng)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
BEGIN
????SET?NOCOUNT?ON;??
????/**
?????*?1)定義全局的臨時表，先根據(jù)六個查詢條件的任意一個，得出臨時表結(jié)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
????)
????--1.1
????IF?@LotName<>''
????BEGIN
????????SELECT?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?NULL

????????SELECT?a.LotPK,a.SourceLotPK,b.LotName?INTO?#WorkSourcePK2?FROM?#WorkSourcePK?a?JOIN?#WorkLotPK?b?ON?a.LotPK=b.LotPK

????????INSERT?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.SNMes
????????DELETE?FROM?#FinalLotName
????????INSERT?INTO?#FinalLotName?SELECT?LotName,SourceLotName,SNCust?FROM?#FinalLotNameX1
????END
????--1.2
????IF?@BatchID<>''
????BEGIN
????????SELECT?Val?INTO?#WorkSourceLot?FROM?fn_String_To_Table(@BatchID,',',1)
????????IF?EXISTS(SELECT?1?FROM?#FinalLotName)--如果@LotName也不為空
????????BEGIN
????????????SELECT?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?#FinalLotName
????????????INSERT?INTO?#FinalLotName?SELECT?LotName,SourceLotName,SNCust?FROM?#FinalLotNameX2
????????END
????????ELSE?--@LotName條件為空
????????BEGIN
????????????SELECT?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.SourceLotPK????
????????????INSERT?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.SNMes
????????????DELETE?FROM?#FinalLotName
????????????INSERT?INTO?#FinalLotName?SELECT?LotName,SourceLotName,SNCust?FROM?#FinalLotNameX21????????
????????END
????END
????--1.3
????IF?@SNCust<>''
????BEGIN
????????SELECT?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
????????BEGIN
????????????SELECT?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?#FinalLotName?
????????????INSERT?INTO?#FinalLotName?SELECT?LotName,SourceLotName,SNCust?FROM?#FinalLotNameX3
????????END
????????ELSE
????????BEGIN
????????????SELECT?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(jù)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?NULL

????????????SELECT?a.LotPK,a.SourceLotPK,b.LotName?INTO?#WorkSourcePK2X?FROM?#WorkSourcePKX?a?JOIN?#WorkLotPKX?b?ON?a.LotPK=b.LotPK

????????????INSERT?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.SNMes
????????????DELETE?FROM?#FinalLotName
????????????INSERT?INTO?#FinalLotName?SELECT?LotName,SourceLotName,SNCust?FROM?#FinalLotNameX31
????????????-----------------------
????????END
????END

????/**
?????* 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ID
????????ComMaterials?NVARCHAR(50),??--SourceSN的物料ID
????????MESOrderID?NVARCHAR(20),
????????OnPlantID?NVARCHAR(20),
????????VendorID?NVARCHAR(20),
????????DateCode?NVARCHAR(20)?,
????????SNNote?NVARCHAR(512)
????)
????--2.1
????IF?@MESOrderID<>''
????BEGIN
????????-------------------------------將MESOrderID做特殊處理-----------------------------------
????????SELECT?Val?INTO?#WorkMESOrderID?FROM?fn_String_To_Table(@MESOrderID,',',1)
????????IF?@OnPlant='Comba'
????????BEGIN
????????????UPDATE?#WorkMESOrderID?SET?Val='C000'+Val?WHERE?LEN(Val)=9
????????END
????????ELSE
????????BEGIN
????????????UPDATE?#WorkMESOrderID?SET?Val='W000'+Val?WHERE?LEN(Val)=9
????????END
????????SELECT?SN,MaterialID,MESOrderID,OnPlantID?INTO?#WorkCO_SN1?FROM?CO_SN_GENERATION?a?WITH(NOLOCK)
????????WHERE?SNType='IntSN'?AND?SNRuleName?=?'ProductSNRule'?AND?OnPlantID=@OnPlant
????????AND?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(yīng)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_SN
????????????SELECT?a.LotName,a.SourceLotName,d.SNCust,b.MaterialID,c.ComMaterials,b.MESOrderID,b.OnPlantID,c.VendorID,c.DateCode,c.SNNote?FROM?#FinalLotName?a?
????????????LEFT?JOIN?#WorkCO_SN1?b?ON?a.LotName=b.SN
????????????LEFT?JOIN?#SourceLotNameTable?c?ON?a.SourceLotName=c.SourceLotName
????????????LEFT?JOIN?CO_SN_LINK_CUSTOMER?d?WITH(NOLOCK)?ON?a.LotName=d.SNMes
????????END
????????ELSE
????????BEGIN
????????????--已知SN集合求解對應(yīng)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?NULL
????????????SELECT?a.LotPK,a.SourceLotPK,b.LotName?INTO?#WorkSourcePK430?FROM?#WorkSourcePK420?a?JOIN?#WorkLotPK410?b?ON?a.LotPK=b.LotPK
????????????INSERT?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.SNMes
????????????DELETE?FROM?#FinalLotName
????????????INSERT?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_SN
????????????SELECT?a.LotName,a.SourceLotName,a.SNCust,b.MaterialID,c.ComMaterials,b.MESOrderID,b.OnPlantID,c.VendorID,c.DateCode,c.SNNote?FROM?#FinalLotName?a?
????????????LEFT?JOIN?#WorkCO_SN1?b?ON?a.LotName=b.SN
????????????LEFT?JOIN?#SourceLotNameTable2?c?ON?a.SourceLotName=c.SourceLotName
????????END????
????END
????--2.2
????IF?@DateCode<>''
????BEGIN
????????SELECT?Val?INTO?#WorkDateCode?FROM?fn_String_To_Table(@DateCode,',',1)
????????--此@DataCode條件求解出來的是SourceSN
????????SELECT?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
????????BEGIN
????????????SELECT?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_SN
????????????INSERT?INTO?#FinalCO_SN?SELECT?LotName,SourceLotName,SNCust,MaterialID,ComMaterials,MESOrderID,OnPlantID,VendorID,DateCode,SNNote?FROM?#TMP51
????????END
????????ELSE
????????BEGIN
????????????IF?EXISTS(SELECT?1?FROM?#FinalLotName)
????????????BEGIN
????????????--查出SourceLotName對應(yīng)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(yīng)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=@OnPlant
????????????AND?EXISTS(SELECT?1?FROM?#FinalLotName?b?WHERE?a.SN=b.LotName)

????????????INSERT?INTO?#FinalCO_SN
????????????SELECT?a.LotName,a.SourceLotName,d.SNCust,b.MaterialID,c.ComMaterials,b.MESOrderID,b.OnPlantID,c.VendorID,c.DateCode,c.SNNote?FROM?#FinalLotName?a?
????????????LEFT?JOIN?#WorkSNT510?b?ON?a.LotName=b.SN
????????????LEFT?JOIN?#WorkSourceSNT1?c?ON?a.SourceLotName=c.SourceSN
????????????LEFT?JOIN?CO_SN_LINK_CUSTOMER?d?WITH(NOLOCK)?ON?a.LotName=d.SNMes

????????????END
????????????ELSE
????????????BEGIN
????????????????--已知SourceSN集合求解對應(yīng)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.SourceLotPK

????????????????INSERT?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.SNMes
????????????????DELETE?FROM?#FinalLotName
????????????????INSERT?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=@OnPlant
????????????????AND?EXISTS(SELECT?1?FROM?#FinalLotName?b?WHERE?a.SN=b.LotName)

????????????????INSERT?INTO?#FinalCO_SN
????????????????SELECT?a.LotName,a.SourceLotName,a.SNCust,b.MaterialID,c.ComMaterials,b.MESOrderID,b.OnPlantID,c.VendorID,c.DateCode,c.SNNote?FROM?#FinalLotName?a?
????????????????LEFT?JOIN?#WorkLotX550?b?ON?a.LotName=b.SN
????????????????LEFT?JOIN?#WorkSourceSNT1?c?ON?a.SourceLotName=c.SourceSN
????????????END
????????END
????END
????--2.3
????IF?@comdef<>''
????BEGIN
????????SELECT?Val?INTO?#WorkComdef?FROM?fn_String_To_Table(@comdef,',',1)
????????--此@comdef條件求解出來的是SourceSN
????????SELECT?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
????????BEGIN
????????????SELECT?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_SN
????????????INSERT?INTO?#FinalCO_SN?SELECT?LotName,SourceLotName,SNCust,MaterialID,ComMaterials,MESOrderID,OnPlantID,VendorID,DateCode,SNNote?FROM?#TMP516
????????END
????????ELSE
????????BEGIN
????????????IF?EXISTS(SELECT?1?FROM?#FinalLotName)
????????????BEGIN
????????????--查出SourceLotName對應(yīng)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(yīng)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=@OnPlant
????????????AND?EXISTS(SELECT?1?FROM?#FinalLotName?b?WHERE?a.SN=b.LotName)

????????????INSERT?INTO?#FinalCO_SN
????????????SELECT?a.LotName,a.SourceLotName,d.SNCust,b.MaterialID,c.ComMaterials,b.MESOrderID,b.OnPlantID,c.VendorID,c.DateCode,c.SNNote?FROM?#FinalLotName?a?
????????????LEFT?JOIN?#WorkSNT5106?b?ON?a.LotName=b.SN
????????????LEFT?JOIN?#WorkSourceSNT16?c?ON?a.SourceLotName=c.SourceSN
????????????LEFT?JOIN?CO_SN_LINK_CUSTOMER?d?WITH(NOLOCK)?ON?a.LotName=d.SNMes

????????????END
????????????ELSE
????????????BEGIN
????????????????--已知SourceSN集合求解對應(yīng)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.SourceLotPK

????????????????INSERT?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.SNMes
????????????????DELETE?FROM?#FinalLotName
????????????????INSERT?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=@OnPlant
????????????????AND?EXISTS(SELECT?1?FROM?#FinalLotName?b?WHERE?a.SN=b.LotName)

????????????????INSERT?INTO?#FinalCO_SN
????????????????SELECT?a.LotName,a.SourceLotName,a.SNCust,b.MaterialID,c.ComMaterials,b.MESOrderID,b.OnPlantID,c.VendorID,c.DateCode,c.SNNote?FROM?#FinalLotName?a?
????????????????LEFT?JOIN?#WorkLotX5506?b?ON?a.LotName=b.SN
????????????????LEFT?JOIN?#WorkSourceSNT16?c?ON?a.SourceLotName=c.SourceSN
????????????END
????????END
????END

????/**
?????*?3)條件判斷結(jié)束
?????**/
????IF?EXISTS(SELECT?1?FROM?#FinalLotName)
????BEGIN
????????IF?EXISTS(SELECT?1?FROM?#FinalCO_SN)
????????BEGIN--3.1
????????????SELECT?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?a
???????????????????JOIN?MMDefinitions?b?WITH(NOLOCK)?ON?a.matl_def_id=b.DefID
???????????????????JOIN?MMDefinitions?c?WITH(NOLOCK)?ON?a.ComMaterials=c.DefID
????????????WHERE?NOT?EXISTS(select?distinct?SN,?SourceSN?from?#FinalCO_SN?x?
?????????????????????????????where?x.SN?=?a.SourceSN?and?x.SourceSN?=?a.SN)
????????END
????????ELSE
????????BEGIN--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=@OnPlant
????????????AND?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.SNCust
????????????FROM?#FinalLotName?a
????????????LEFT?JOIN?#FinalSNX1?b?ON?a.LotName=b.SN
????????????LEFT?JOIN?#FinalSNX2?c?ON?a.SourceLotName=c.SourceLotName
????????????JOIN?MMDefinitions?x?WITH(NOLOCK)?ON?b.MaterialID=x.DefID
????????????JOIN?MMDefinitions?y?WITH(NOLOCK)?ON?c.ComMaterials=y.DefID
????????????WHERE?NOT?EXISTS(
????????????????SELECT?DISTINCT?*?FROM?#FinalLotName?z
????????????????WHERE?z.LotName=a.SourceLotName?and?z.SourceLotName=a.LotName
????????????)
????????END
????END
????ELSE
????BEGIN
????????IF?EXISTS(SELECT?1?FROM?#FinalCO_SN)
????????BEGIN--3.3
????????????SELECT?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?a
???????????????????JOIN?MMDefinitions?b?WITH(NOLOCK)?ON?a.matl_def_id=b.DefID
???????????????????JOIN?MMDefinitions?c?WITH(NOLOCK)?ON?a.ComMaterials=c.DefID
????????????WHERE?NOT?EXISTS(select?distinct?SN,?SourceSN?from?#FinalCO_SN?x?
?????????????????????????????where?x.SN?=?a.SourceSN?and?x.SourceSN?=?a.SN)
????????END
????????ELSE
????????BEGIN--3.4
????????????PRINT?'There?is?no?queryable?condition,please?enter?at?less?a?query?conditon.'
????????END
????END

END
GO

雖然犧牲了代碼的可讀性，但創(chuàng)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(jié)

平常的你是否偶爾會因急于完成任務(wù)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(xí)慣。

本文的優(yōu)化思想很簡單，關(guān)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(yè)務(wù)需求允許臟讀，可加 with（nolock）預(yù)防查詢被更新事物阻塞。

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明天見(??ω??)??

耗時3天，上億數(shù)據(jù)如何做到秒級查詢？

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