sql-server - 如何在 mssql 上的 where 中使用 (AS) TOTAL？

Question

如何在 where 中使用 (AS) TOTALNAME

SELECT 
   *, CITY + ' / ' + NAME AS TOTALNAME
FROM 
   FARKETMEZ
WHERE
   TOTALNAME like '%TURKEY%'

Answer 1

您不能使用与子句ALIAS处于同一级别的 that 。WHERE

你有两个选择：

• 通过直接使用表达式

询问：

SELECT  *, CITY + ' / ' + NAME AS TOTALNAME
FROM  FARKETMEZ
WHERE TOTALNAME like '%TURKEY%'

• 通过包装在子查询中

询问：

SELECT *
FROM
(    SELECT  *, CITY + ' / ' + NAME AS TOTALNAME
    FROM  FARKETMEZ
) a
WHERE TOTALNAME like '%TURKEY%'

SQL 操作顺序如下：

• FROM 子句
• WHERE 子句
• GROUP BY 子句
• HAVING 子句
• 选择子句
• ORDER BY 子句

之所以不能直接使用，是因为子句在创建语句WHERE之前先执行。SELECTALIAS

Answer 2

您不能直接使用派生表，也可以使用 CTE (SQL Server 2005+)：

派生表：

SELECT *
FROM (  SELECT 
           *, CITY + ' / ' + NAME AS TOTALNAME
        FROM 
           FARKETMEZ
      ) AS T
WHERE TOTALNAME like '%TURKEY%'

热电偶：

;WITH CTE AS
(
    SELECT 
           *, CITY + ' / ' + NAME AS TOTALNAME
    FROM 
       FARKETMEZ
)
SELECT *
FROM CTE 
WHERE TOTALNAME like '%TURKEY%'