Select变成临时table效率比直接查询快
Select into a temporary table efficiency is faster than direct query
案例：
下面的查询sql需要10.56秒，查询了236行。
select
t2.dep,t1.*
from (
select * from hct_dailywork with (nolock) where date = '2021-09-28'
) T1
left join mf_mo T2 with (nolock) on T1.mo_no = T2.mo_no
预计执行计划：
最多花费：
在我尝试使用select into temporary table之后，它只需要0.03秒
select * into #T from (
select * from hct_dailywork with (nolock) where date = '2021-09-28'
)T;
select
t2.dep,t1.*
from #T T1
left join mf_mo T2 with (nolock) on T1.mo_no = T2.mo_no
预计执行计划：
然后我尝试添加下面的索引，但它仍然没有变化。
create index idx_hct_dailywork_mo_no on hct_dailywork (mo_no)
create unique index ak_hct_dailywork_mo_no on hct_dailywork (id,mo_no);
hct_mlots table 创建sql，总行数88790
CREATE TABLE [dbo].[Hct_DailyWork](
[ID] [uniqueidentifier] NOT NULL,
[emp_no] [nvarchar](200) NOT NULL,
[mo_no] [nvarchar](200) NOT NULL,
[date] [nvarchar](200) NOT NULL,
[shift] [nvarchar](200) NOT NULL,
[tz_no] [nvarchar](200) NOT NULL,
[human_worktime] [decimal](20, 5) NULL,
[eqp_worktime] [decimal](20, 5) NULL,
[human_num] [decimal](20, 5) NULL,
[pass_num] [decimal](20, 5) NULL,
[ng_num] [decimal](20, 5) NULL,
[ng_reason] [nvarchar](200) NULL,
[flag] [char](1) NOT NULL,
[log] [nvarchar](max) NULL,
[createtime] [datetime] NOT NULL,
[rem] [nvarchar](1000) NULL,
PRIMARY KEY CLUSTERED
(
[ID] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY] TEXTIMAGE_ON [PRIMARY]
GO
ALTER TABLE [dbo].[Hct_DailyWork] ADD DEFAULT (newsequentialid()) FOR [ID]
GO
ALTER TABLE [dbo].[Hct_DailyWork] ADD DEFAULT ('N') FOR [flag]
GO
ALTER TABLE [dbo].[Hct_DailyWork] ADD DEFAULT (sysdatetime()) FOR [createtime]
GO
create index idx_hct_dailywork_mo_no on hct_dailywork (mo_no)
create unique index ak_hct_dailywork_mo_no on hct_dailywork (id,mo_no);
GO
mf_mo table 创建 SQL
CREATE TABLE [dbo].[MF_MO](
[MO_NO] [varchar](20) NOT NULL,
[MO_DD] [datetime] NULL,
[STA_DD] [datetime] NULL,
[END_DD] [datetime] NULL,
[BIL_ID] [varchar](2) NULL,
[BIL_NO] [varchar](20) NULL,
[MRP_NO] [varchar](30) NULL,
[PRD_MARK] [varchar](40) NULL,
[WH] [varchar](12) NULL,
[SO_NO] [varchar](20) NULL,
[UNIT] [varchar](1) NULL,
[QTY] [numeric](22, 8) NULL,
[QTY1] [numeric](22, 8) NULL,
[NEED_DD] [datetime] NULL,
[DEP] [varchar](8) NULL,
[CUS_NO] [varchar](12) NULL,
[CLOSE_ID] [varchar](1) NULL,
[USR] [varchar](12) NULL,
[CHK_MAN] [varchar](12) NULL,
[BAT_NO] [varchar](40) NULL,
[REM] [text] NULL,
[PO_OK] [varchar](1) NULL,
[MO_NO_ADD] [varchar](38) NULL,
[QTY_FIN] [numeric](22, 8) NULL,
[QTY_FIN_UNSH] [numeric](22, 8) NULL,
[TIME_AJ] [numeric](22, 8) NULL,
[QTY_ML] [numeric](22, 8) NULL,
[QTY_ML_UNSH] [numeric](22, 8) NULL,
[BUILD_BIL] [text] NULL,
[CST_MAKE] [numeric](22, 8) NULL,
[CST_PRD] [numeric](22, 8) NULL,
[CST_OUT] [numeric](22, 8) NULL,
[CST_MAN] [numeric](22, 8) NULL,
[USED_TIME] [numeric](22, 8) NULL,
[CST] [numeric](22, 8) NULL,
[PRT_SW] [varchar](1) NULL,
[OPN_DD] [datetime] NULL,
[FIN_DD] [datetime] NULL,
[BIL_MAK] [varchar](1) NULL,
[CPY_SW] [varchar](1) NULL,
[CONTRACT] [varchar](80) NULL,
[EST_ITM] [int] NULL,
[ML_OK] [varchar](1) NULL,
[MD_NO] [varchar](400) NULL,
[QTY_RK] [numeric](22, 8) NULL,
[QTY_RK_UNSH] [numeric](22, 8) NULL,
[CLS_DATE] [datetime] NULL,
[ID_NO] [varchar](38) NULL,
[QTY_CHK] [numeric](22, 8) NULL,
[CONTROL] [varchar](1) NULL,
[ISNORMAL] [varchar](1) NULL,
[QC_YN] [varchar](1) NULL,
[MM_CURML] [varchar](1) NULL,
[TS_ID] [varchar](1) NULL,
[BIL_TYPE] [varchar](2) NULL,
[CNTT_NO] [varchar](40) NULL,
[MOB_ID] [varchar](2) NULL,
[LOCK_MAN] [varchar](12) NULL,
[LOCK_DATE] [datetime] NULL,
[SEB_NO] [varchar](200) NULL,
[GRP_NO] [varchar](20) NULL,
[OUT_DD_MOJ] [datetime] NULL,
[SYS_DATE] [datetime] NULL,
[PG_ID] [varchar](1) NULL,
[SUP_PRD_NO] [varchar](40) NULL,
[TIME_CNT] [numeric](22, 8) NULL,
[ML_BY_MM] [varchar](1) NULL,
[CAS_NO] [varchar](20) NULL,
[TASK_ID] [int] NULL,
[OLD_ID] [varchar](1) NULL,
[CF_ID] [varchar](1) NULL,
[CUS_OS_NO] [varchar](30) NULL,
[PRT_USR] [varchar](12) NULL,
[QTY_QL] [numeric](22, 8) NULL,
[QTY_QL_UNSH] [numeric](22, 8) NULL,
[QL_ID] [varchar](1) NULL,
[Q2_ID] [varchar](1) NULL,
[Q3_ID] [varchar](1) NULL,
[ISSVS] [varchar](1) NULL,
[QTY_DM] [numeric](22, 8) NULL,
[QTY_DM_UNSH] [numeric](22, 8) NULL,
[CST_MAN_ML] [numeric](22, 8) NULL,
[CST_MAK_ML] [numeric](22, 8) NULL,
[CST_PRD_ML] [numeric](22, 8) NULL,
[CST_OUT_ML] [numeric](22, 8) NULL,
[CST_ML] [numeric](22, 8) NULL,
[LOCK] [varchar](1) NULL,
[QTY_LOST] [numeric](22, 8) NULL,
[QTY_LOST_UNSH] [numeric](22, 8) NULL,
[ISFROMQD] [varchar](1) NULL,
[ZT_ID] [varchar](1) NULL,
[ZT_DD] [datetime] NULL,
[CV_ID] [varchar](1) NULL,
[CU_NO] [varchar](20) NULL,
[QTY_CHK_UNSH] [numeric](22, 8) NULL,
[CANCEL_ID] [varchar](1) NULL,
[SUP_PRD_MARK] [varchar](40) NULL,
[PRT_DATE] [datetime] NULL,
[BJ_NO] [varchar](20) NULL,
[MODIFY_DD] [datetime] NULL,
[MODIFY_MAN] [varchar](12) NULL,
[DEC_UN] [int] NULL,
[QTY_QS] [numeric](22, 8) NULL,
[QTY_QS_UNSH] [numeric](22, 8) NULL,
[BACK_ID] [varchar](2) NULL,
[QTY_PG] [numeric](22, 8) NULL,
[QTY_PG_UNSH] [numeric](22, 8) NULL,
[mlotcount] [int] NULL,
[pass_mis_mm_before_check] [char](1) NULL,
[MIS_BAT_NO] [nvarchar](40) NULL,
CONSTRAINT [PK__MF_MO] PRIMARY KEY CLUSTERED
(
[MO_NO] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY] TEXTIMAGE_ON [PRIMARY]
GO
ALTER TABLE [dbo].[MF_MO] ADD CONSTRAINT [DF_MF_MO_PRD_MARK] DEFAULT (space((0))) FOR [PRD_MARK]
GO
ALTER TABLE [dbo].[MF_MO] ADD CONSTRAINT [DF_MF_MO_QTY_FIN] DEFAULT ('0') FOR [QTY_FIN]
GO
ALTER TABLE [dbo].[MF_MO] ADD CONSTRAINT [DF_MF_MO_QTY_FIN_UNSH] DEFAULT ('0') FOR [QTY_FIN_UNSH]
GO
ALTER TABLE [dbo].[MF_MO] ADD CONSTRAINT [DF_MF_MO_QTY_ML] DEFAULT ('0') FOR [QTY_ML]
GO
ALTER TABLE [dbo].[MF_MO] ADD CONSTRAINT [DF_MF_MO_QTY_ML_UNSH] DEFAULT ('0') FOR [QTY_ML_UNSH]
GO
我犯了一个白痴错误，两个列类型不同，mf_mo的mo_no是varchar(20)而hct_dailywork是nvarchar(200)，所以索引不为他们工作..（为了方便，我使用了自动生成工具，但没有仔细检查）
更新估计执行计划
案例：
下面的查询sql需要10.56秒，查询了236行。
select
t2.dep,t1.*
from (
select * from hct_dailywork with (nolock) where date = '2021-09-28'
) T1
left join mf_mo T2 with (nolock) on T1.mo_no = T2.mo_no
预计执行计划：
在我尝试使用select into temporary table之后，它只需要0.03秒
select * into #T from (
select * from hct_dailywork with (nolock) where date = '2021-09-28'
)T;
select
t2.dep,t1.*
from #T T1
left join mf_mo T2 with (nolock) on T1.mo_no = T2.mo_no
预计执行计划：
然后我尝试添加下面的索引，但它仍然没有变化。
create index idx_hct_dailywork_mo_no on hct_dailywork (mo_no)
create unique index ak_hct_dailywork_mo_no on hct_dailywork (id,mo_no);
hct_mlots table 创建sql，总行数88790
CREATE TABLE [dbo].[Hct_DailyWork](
[ID] [uniqueidentifier] NOT NULL,
[emp_no] [nvarchar](200) NOT NULL,
[mo_no] [nvarchar](200) NOT NULL,
[date] [nvarchar](200) NOT NULL,
[shift] [nvarchar](200) NOT NULL,
[tz_no] [nvarchar](200) NOT NULL,
[human_worktime] [decimal](20, 5) NULL,
[eqp_worktime] [decimal](20, 5) NULL,
[human_num] [decimal](20, 5) NULL,
[pass_num] [decimal](20, 5) NULL,
[ng_num] [decimal](20, 5) NULL,
[ng_reason] [nvarchar](200) NULL,
[flag] [char](1) NOT NULL,
[log] [nvarchar](max) NULL,
[createtime] [datetime] NOT NULL,
[rem] [nvarchar](1000) NULL,
PRIMARY KEY CLUSTERED
(
[ID] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY] TEXTIMAGE_ON [PRIMARY]
GO
ALTER TABLE [dbo].[Hct_DailyWork] ADD DEFAULT (newsequentialid()) FOR [ID]
GO
ALTER TABLE [dbo].[Hct_DailyWork] ADD DEFAULT ('N') FOR [flag]
GO
ALTER TABLE [dbo].[Hct_DailyWork] ADD DEFAULT (sysdatetime()) FOR [createtime]
GO
create index idx_hct_dailywork_mo_no on hct_dailywork (mo_no)
create unique index ak_hct_dailywork_mo_no on hct_dailywork (id,mo_no);
GO
mf_mo table 创建 SQL
CREATE TABLE [dbo].[MF_MO](
[MO_NO] [varchar](20) NOT NULL,
[MO_DD] [datetime] NULL,
[STA_DD] [datetime] NULL,
[END_DD] [datetime] NULL,
[BIL_ID] [varchar](2) NULL,
[BIL_NO] [varchar](20) NULL,
[MRP_NO] [varchar](30) NULL,
[PRD_MARK] [varchar](40) NULL,
[WH] [varchar](12) NULL,
[SO_NO] [varchar](20) NULL,
[UNIT] [varchar](1) NULL,
[QTY] [numeric](22, 8) NULL,
[QTY1] [numeric](22, 8) NULL,
[NEED_DD] [datetime] NULL,
[DEP] [varchar](8) NULL,
[CUS_NO] [varchar](12) NULL,
[CLOSE_ID] [varchar](1) NULL,
[USR] [varchar](12) NULL,
[CHK_MAN] [varchar](12) NULL,
[BAT_NO] [varchar](40) NULL,
[REM] [text] NULL,
[PO_OK] [varchar](1) NULL,
[MO_NO_ADD] [varchar](38) NULL,
[QTY_FIN] [numeric](22, 8) NULL,
[QTY_FIN_UNSH] [numeric](22, 8) NULL,
[TIME_AJ] [numeric](22, 8) NULL,
[QTY_ML] [numeric](22, 8) NULL,
[QTY_ML_UNSH] [numeric](22, 8) NULL,
[BUILD_BIL] [text] NULL,
[CST_MAKE] [numeric](22, 8) NULL,
[CST_PRD] [numeric](22, 8) NULL,
[CST_OUT] [numeric](22, 8) NULL,
[CST_MAN] [numeric](22, 8) NULL,
[USED_TIME] [numeric](22, 8) NULL,
[CST] [numeric](22, 8) NULL,
[PRT_SW] [varchar](1) NULL,
[OPN_DD] [datetime] NULL,
[FIN_DD] [datetime] NULL,
[BIL_MAK] [varchar](1) NULL,
[CPY_SW] [varchar](1) NULL,
[CONTRACT] [varchar](80) NULL,
[EST_ITM] [int] NULL,
[ML_OK] [varchar](1) NULL,
[MD_NO] [varchar](400) NULL,
[QTY_RK] [numeric](22, 8) NULL,
[QTY_RK_UNSH] [numeric](22, 8) NULL,
[CLS_DATE] [datetime] NULL,
[ID_NO] [varchar](38) NULL,
[QTY_CHK] [numeric](22, 8) NULL,
[CONTROL] [varchar](1) NULL,
[ISNORMAL] [varchar](1) NULL,
[QC_YN] [varchar](1) NULL,
[MM_CURML] [varchar](1) NULL,
[TS_ID] [varchar](1) NULL,
[BIL_TYPE] [varchar](2) NULL,
[CNTT_NO] [varchar](40) NULL,
[MOB_ID] [varchar](2) NULL,
[LOCK_MAN] [varchar](12) NULL,
[LOCK_DATE] [datetime] NULL,
[SEB_NO] [varchar](200) NULL,
[GRP_NO] [varchar](20) NULL,
[OUT_DD_MOJ] [datetime] NULL,
[SYS_DATE] [datetime] NULL,
[PG_ID] [varchar](1) NULL,
[SUP_PRD_NO] [varchar](40) NULL,
[TIME_CNT] [numeric](22, 8) NULL,
[ML_BY_MM] [varchar](1) NULL,
[CAS_NO] [varchar](20) NULL,
[TASK_ID] [int] NULL,
[OLD_ID] [varchar](1) NULL,
[CF_ID] [varchar](1) NULL,
[CUS_OS_NO] [varchar](30) NULL,
[PRT_USR] [varchar](12) NULL,
[QTY_QL] [numeric](22, 8) NULL,
[QTY_QL_UNSH] [numeric](22, 8) NULL,
[QL_ID] [varchar](1) NULL,
[Q2_ID] [varchar](1) NULL,
[Q3_ID] [varchar](1) NULL,
[ISSVS] [varchar](1) NULL,
[QTY_DM] [numeric](22, 8) NULL,
[QTY_DM_UNSH] [numeric](22, 8) NULL,
[CST_MAN_ML] [numeric](22, 8) NULL,
[CST_MAK_ML] [numeric](22, 8) NULL,
[CST_PRD_ML] [numeric](22, 8) NULL,
[CST_OUT_ML] [numeric](22, 8) NULL,
[CST_ML] [numeric](22, 8) NULL,
[LOCK] [varchar](1) NULL,
[QTY_LOST] [numeric](22, 8) NULL,
[QTY_LOST_UNSH] [numeric](22, 8) NULL,
[ISFROMQD] [varchar](1) NULL,
[ZT_ID] [varchar](1) NULL,
[ZT_DD] [datetime] NULL,
[CV_ID] [varchar](1) NULL,
[CU_NO] [varchar](20) NULL,
[QTY_CHK_UNSH] [numeric](22, 8) NULL,
[CANCEL_ID] [varchar](1) NULL,
[SUP_PRD_MARK] [varchar](40) NULL,
[PRT_DATE] [datetime] NULL,
[BJ_NO] [varchar](20) NULL,
[MODIFY_DD] [datetime] NULL,
[MODIFY_MAN] [varchar](12) NULL,
[DEC_UN] [int] NULL,
[QTY_QS] [numeric](22, 8) NULL,
[QTY_QS_UNSH] [numeric](22, 8) NULL,
[BACK_ID] [varchar](2) NULL,
[QTY_PG] [numeric](22, 8) NULL,
[QTY_PG_UNSH] [numeric](22, 8) NULL,
[mlotcount] [int] NULL,
[pass_mis_mm_before_check] [char](1) NULL,
[MIS_BAT_NO] [nvarchar](40) NULL,
CONSTRAINT [PK__MF_MO] PRIMARY KEY CLUSTERED
(
[MO_NO] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY] TEXTIMAGE_ON [PRIMARY]
GO
ALTER TABLE [dbo].[MF_MO] ADD CONSTRAINT [DF_MF_MO_PRD_MARK] DEFAULT (space((0))) FOR [PRD_MARK]
GO
ALTER TABLE [dbo].[MF_MO] ADD CONSTRAINT [DF_MF_MO_QTY_FIN] DEFAULT ('0') FOR [QTY_FIN]
GO
ALTER TABLE [dbo].[MF_MO] ADD CONSTRAINT [DF_MF_MO_QTY_FIN_UNSH] DEFAULT ('0') FOR [QTY_FIN_UNSH]
GO
ALTER TABLE [dbo].[MF_MO] ADD CONSTRAINT [DF_MF_MO_QTY_ML] DEFAULT ('0') FOR [QTY_ML]
GO
ALTER TABLE [dbo].[MF_MO] ADD CONSTRAINT [DF_MF_MO_QTY_ML_UNSH] DEFAULT ('0') FOR [QTY_ML_UNSH]
GO
我犯了一个白痴错误，两个列类型不同，mf_mo的mo_no是varchar(20)而hct_dailywork是nvarchar(200)，所以索引不为他们工作..（为了方便，我使用了自动生成工具，但没有仔细检查）
更新估计执行计划