在查询中帮助concat

Question

如何使这个工作？

SELECT Concat(city, ' ', location, ' ', location2) as src1 
FROM locations
WHERE src1 LIKE '%var%'

Answer 1

如何使用 + cocantenation运算符

SELECT  city + ' ' + location + ' ' + location2  as src1 
FROM    locations 
WHERE   city + ' ' + location + ' ' + location2 LIKE '%var%'

查看+ (String Concatenation) (Transact-SQL)

或者您可以使用子选择

SELECT  *
FROM    (
            SELECT  city + ' ' + location + ' ' + location2  as src1 
            FROM    locations 
        ) vals
WHERE   vals.src1 LIKE '%var%'

或者使用Sql Server 2005+，您可以使用WITH语句

;WITH vals AS(
        SELECT  city + ' ' + location + ' ' + location2  as src1 
        FROM    locations
)
SELECT  *
FROM    vals
WHERE   src1 LIKE '%var%'

Answer 2

SELECT Concat( city, ' ', locatio`n, ' ', location2 ) as src1 FROM locations WHERE Concat( city, ' ', location, ' ', location2 ) LIKE '%var%'` 

将起作用