OR는 SQL Server의 CASE 문에서 지원되지 않습니다.

OR는 SQL Server의 CASE 문에서 지원되지 않습니다.

---

OR연산자 WHEN(A)의 절 CASE문이 지원되지 않습니다. 어떻게 할 수 있습니까?

CASE ebv.db_no 
    WHEN 22978 OR 23218 OR 23219 THEN 'WECS 9500' 
    ELSE 'WECS 9520' 
END as wecs_system 

---

이 형식을 사용하려면 다음 중 하나를 사용해야합니다.

CASE ebv.db_no 
  WHEN 22978 THEN 'WECS 9500' 
  WHEN 23218 THEN 'WECS 9500'  
  WHEN 23219 THEN 'WECS 9500' 
  ELSE 'WECS 9520' 
END as wecs_system 

그렇지 않으면 다음을 사용하십시오.

CASE  
  WHEN ebv.db_no IN (22978, 23218, 23219) THEN 'WECS 9500' 
  ELSE 'WECS 9520' 
END as wecs_system 

---

CASE
  WHEN ebv.db_no = 22978 OR 
       ebv.db_no = 23218 OR
       ebv.db_no = 23219
  THEN 'WECS 9500' 
  ELSE 'WECS 9520' 
END as wecs_system 

---

CASE WHEN ebv.db_no  IN (22978, 23218, 23219) THEN 'WECS 9500' 
  ELSE 'WECS 9520' 
END as wecs_system 

---

WHEN에있는 표현식 중 하나를 사용할 수 있지만 둘 다 혼합 할 수는 없습니다.

1. WHEN when_expression

   단순 CASE 형식을 사용할 때 input_expression과 비교되는 단순 식입니다. when_expression은 유효한 식입니다. input_expression 및 각 when_expression의 데이터 유형은 동일하거나 암시 적 변환이어야합니다.

2. WHEN 부울 _ 식

   검색된 CASE 형식을 사용할 때 평가되는 부울 식입니다. Boolean_expression은 유효한 부울 식입니다.

다음을 프로그래밍 할 수 있습니다.

1.

    CASE ProductLine
            WHEN 'R' THEN 'Road'
            WHEN 'M' THEN 'Mountain'
            WHEN 'T' THEN 'Touring'
            WHEN 'S' THEN 'Other sale items'
            ELSE 'Not for sale'

2.

    CASE
            WHEN ListPrice =  0 THEN 'Mfg item - not for resale'
            WHEN ListPrice < 50 THEN 'Under $50'
            WHEN ListPrice >= 50 and ListPrice < 250 THEN 'Under $250'
            WHEN ListPrice >= 250 and ListPrice < 1000 THEN 'Under $1000'
            ELSE 'Over $1000'
          END

그러나 어쨌든 변수 순위가 부울 식으로 비교 될 것이라고 예상 할 수 있습니다.

See CASE (Transact-SQL) (MSDN).

---

There are already a lot of answers with respect to CASE. I will explain when and how to use CASE.

You can use CASE expressions anywhere in the SQL queries. CASE expressions can be used within the SELECT statement, WHERE clauses, Order by clause, HAVING clauses, Insert, UPDATE and DELETE statements.

A CASE expression has the following two formats:

1. Simple CASE expression

   CASE expression
   WHEN expression1 THEN Result1
   WHEN expression2 THEN Result2
   ELSE ResultN
   END
   

   This compares an expression to a set of simple expressions to find the result. This expression compares an expression to the expression in each WHEN clause for equivalency. If the expression within the WHEN clause is matched, the expression in the THEN clause will be returned.

   This is where the OP's question is falling. 22978 OR 23218 OR 23219 will not get a value equal to the expression i.e. ebv.db_no. That's why it is giving an error. The data types of input_expression and each when_expression must be the same or must be an implicit conversion.

2. Searched CASE expressions

   CASE
   WHEN Boolean_expression1 THEN Result1
   WHEN Boolean_expression2 THEN Result2
   ELSE ResultN
   END
   

   This expression evaluates a set of boolean expressions to find the result. This expression allows comparison operators, and logical operators AND/OR with in each Boolean expression.

1.SELECT statement with CASE expressions

--Simple CASE expression: 
SELECT FirstName, State=(CASE StateCode
 WHEN 'MP' THEN 'Madhya Pradesh' 
 WHEN 'UP' THEN 'Uttar Pradesh' 
 WHEN 'DL' THEN 'Delhi' 
 ELSE NULL 
 END), PayRate
FROM dbo.Customer

-- Searched CASE expression:
SELECT FirstName,State=(CASE 
 WHEN StateCode = 'MP' THEN 'Madhya Pradesh' 
 WHEN StateCode = 'UP' THEN 'Uttar Pradesh' 
 WHEN StateCode = 'DL' THEN 'Delhi' 
 ELSE NULL 
 END), PayRate
FROM dbo.Customer

2.Update statement with CASE expression

-- Simple CASE expression: 
UPDATE Customer 
SET StateCode = CASE StateCode
 WHEN 'MP' THEN 'Madhya Pradesh' 
 WHEN 'UP' THEN 'Uttar Pradesh' 
 WHEN 'DL' THEN 'Delhi' 
 ELSE NULL 
 END 

-- Simple CASE expression: 
UPDATE Customer 
SET StateCode = CASE 
 WHEN StateCode = 'MP' THEN 'Madhya Pradesh' 
 WHEN StateCode = 'UP' THEN 'Uttar Pradesh' 
 WHEN StateCode = 'DL' THEN 'Delhi' 
 ELSE NULL 
 END 

3.ORDER BY clause with CASE expressions

-- Simple CASE expression: 
SELECT * FROM dbo.Customer
ORDER BY 
 CASE Gender WHEN 'M' THEN FirstName END Desc,
 CASE Gender WHEN 'F' THEN LastName END ASC

-- Searched CASE expression: 
SELECT * FROM dbo.Customer
ORDER BY 
 CASE WHEN Gender='M' THEN FirstName END Desc,
 CASE WHEN Gender='F' THEN LastName END ASC

4.Having Clause with CASE expression

-- Simple CASE expression: 
SELECT FirstName ,StateCode,Gender, Total=MAX(PayRate)
FROM dbo.Customer
GROUP BY StateCode,Gender,FirstName
HAVING (MAX(CASE Gender WHEN 'M' 
 THEN PayRate 
 ELSE NULL END) > 180.00
 OR MAX(CASE Gender WHEN 'F' 
 THEN PayRate 
 ELSE NULL END) > 170.00)

-- Searched CASE expression: 
SELECT FirstName ,StateCode,Gender, Total=MAX(PayRate)
FROM dbo.Customer
GROUP BY StateCode,Gender,FirstName
HAVING (MAX(CASE WHEN Gender = 'M' 
 THEN PayRate 
 ELSE NULL END) > 180.00
 OR MAX(CASE WHEN Gender = 'F' 
 THEN PayRate 
 ELSE NULL END) > 170.00)

Hope this use cases will help someone in future.

Source

---

Try

CASE WHEN ebv.db_no IN (22978,23218,23219) THEN 'WECS 9500' ELSE 'WECS 9520' END

---

SELECT
  Store_Name,
  CASE Store_Name
    WHEN 'Los Angeles' THEN Sales * 2
    WHEN 'San Diego' THEN Sales * 1.5
    ELSE Sales
    END AS "New Sales",
  Txn_Date
FROM Store_Information;

---

select id,phno,case gender
when 'G' then 'M'
when 'L' then 'F'
else
'No gender'
end
as gender 
from contacts

---

UPDATE table_name 
  SET column_name=CASE 
WHEN column_name in ('value1', 'value2',.....) 
  THEN 'update_value' 
WHEN column_name in ('value1', 'value2',.....) 
  THEN 'update_value' 
END

table_name = The name of table on which you want to perform operation.

column_name = The name of Column/Field of which value you want to set.

update_value = The value you want to set of column_name

---

Select s.stock_code,s.stock_desc,s.stock_desc_ar,
mc.category_name,s.sel_price,
case when s.allow_discount=0 then 'Non Promotional Item' else 'Prmotional 
item' end 'Promotion'
From tbl_stock s inner join tbl_stock_category c on s.stock_id=c.stock_id
inner join tbl_category mc on c.category_id=mc.category_id
where mc.category_id=2 and s.isSerialBased=0 

참고URL : https://stackoverflow.com/questions/5487892/or-is-not-supported-with-case-statement-in-sql-server