SQL中优化IN的几种方法

Select * from TableA where name IN ('A','B','C');

Select * from TableA where name='A' OR name='B' OR name='C';

SELECT *
FROM TableA a
WHERE EXISTS (
SELECT 1
FROM ( VALUES  ('A'),('B'),('C')) AS tmp(name) 

-- SQL Server/PostgreSQL/MySQL 8.0+ 语法
SELECT TableA.*
FROM TableA
JOIN ( VALUES  ('A'),('B'),('C')) AS tmp(name)
ON TableA.name = tmp.name

Select * from TableA  where name='A'   union all
Select * from TableA  where name='B'   union all
Select * from TableA  where name='C '  
或
Select * from TableA where name = ANY('A','B','C');

 SELECT  * from TableA WHERE
   A.name IN  ('A','B','C') 
   AND A.types IN ('1','3','7','8') 
   AND A.age IN ('33','35','39') 

declare  
@name  varchar(100)='A,B,C',
@type  varchar(100)='1,3,7,8',
@age  varchar(100)='33,35,39'

--列转行
 if object_id('tempdb..#MyTemp') is not null    
 Begin    
  DROP TABLE #MyTemp 
 End
   
 Select * Into #MyTempTable1 From     
 (    
  SELECT B.id,B.typeid      
  FROM   (      
     SELECT [value] = CONVERT(XML, '<v>' + REPLACE(@name,',', '</v><v>') + '</v>')      
    ) A      
    OUTER APPLY(      
   SELECT id = N.v.value('.', 'nvarchar(100)'),typeid=1    
   FROM   A.[value].nodes('/v') N(v)      
  ) B      
  Union    
  SELECT D.id,D.typeid      
  FROM   (      
     SELECT [value] = CONVERT(XML, '<v>' + REPLACE(@type,',', '</v><v>') + '</v>')      
    ) C      
    OUTER APPLY(      
   SELECT id = N.v.value('.', 'nvarchar(100)'),typeid=2    
   FROM   C.[value].nodes('/v') N(v)      
  ) D 
   Union    
  SELECT D.id,D.typeid      
  FROM   (      
     SELECT [value] = CONVERT(XML, '<v>' + REPLACE(@age,',', '</v><v>') + '</v>')      
    ) E      
    OUTER APPLY(      
   SELECT id = N.v.value('.', 'nvarchar(100)'),typeid=3    
   FROM   C.[value].nodes('/v') N(v)      
  )F
 ) as T   
--EXISTS 子查询
 Select * from TableA A where 
   A.name IN  (select id from #MyTemp where typeid=1) 
   AND A.types IN (select id from #MyTemp where typeid=2) 
   AND A.age IN (select id from #MyTemp where typeid=3) 

Select * from TableA A where 
   A.name IN  (select id from #MyTemp where typeid=1) 
   AND A.types IN (select id from #MyTemp where typeid=2) 
   AND A.age IN (select id from #MyTemp where typeid=3) 

Select * from TableA A 
  JOIN #MyTempTable1 B 
		  ON B.id = A.DATAAREAID 
		 AND B.typeid=1
		WHERE
   A.types IN (select id from #MyTemp where typeid=2) 
   AND A.age IN (select id from #MyTemp where typeid=3) 
  

Select * from TableA A 
  JOIN #MyTempTable1 B 
		  ON B.id = A.DATAAREAID 
		 AND B.typeid=1
		WHERE
   A.types = ANY(select id from #MyTemp where typeid=2) 
   AND A.age = ANY(select id from #MyTemp where typeid=3)