MySql：FIND_IN_SET无法正常工作

Question

我有一个带有字符串参数的存储过程。 此参数以'759,760,761'分隔。 在where子句中，我想这样使用它。

...AND REL.CountyId IN (FIND_IN_SET(REL.CountyId, '759,760,761') > 0) 

但是没有返回的数据，但是有759个县ID的行。 如果删除此子句，数据就来了。

这是我所有的sql代码：

    SELECT 
    REL.RealEstateListingId,
    (SELECT 
            ImageUrl
        FROM
            realestateimage
        WHERE
            IsMainImage = 1 AND Status = 1
                AND RealEstateListingId = REL.RealEstateListingId) AS ImageUrl,

    REL.ListingNumber,
    REL.Caption,
    REL.M2,
    REL.RoomCount,
    /*CONCAT((SELECT Name FROM City WHERE CityId IN (SELECT CityId FROM County WHERE CountyId = REL.CountyId)),'/', (SELECT Name FROM County WHERE CountyId = REL.CountyId)) AS Region,*/
    REL.Price,
    REL.Creation,
    REL.CountyId
FROM
    realestatelisting AS REL
        INNER JOIN
    User AS U ON U.UserId = REL.CreatedBy
        /*INNER JOIN realestatefilterrelation AS RFR ON RFR.RealEstateId = REL.RealEstateListingId*/
WHERE  REL.Price  BETWEEN 0 AND 1000000
   AND CAST(REL.M2 AS SIGNED) BETWEEN 0 AND 1000
   /*AND REL.CountyId IN (FIND_IN_SET(REL.CountyId, '759') > 0) 

  /*AND RFR.FilterContentId IN(FIND_IN_SET(RFR.FilterContentId, filterIds) > 0)*/
ORDER BY REL.Creation;

Answer 1

尝试这种方式：

...AND FIND_IN_SET(REL.CountyId, '759,760,761') > 0

在查询中可能看起来像：

...
WHERE  REL.Price  BETWEEN 0 AND 1000000
   AND CAST(REL.M2 AS SIGNED) BETWEEN 0 AND 1000
   AND FIND_IN_SET(REL.CountyId, '759') > 0
   AND FIND_IN_SET(RFR.FilterContentId, filterIds) > 0
ORDER BY REL.Creation;

FIND_IN_SET(str,strlist)

如果字符串str在由N个子字符串组成的字符串列表strlist中，则返回1到N范围内的值。

如果str不在strlist中或strlist为空字符串，则返回0。

...因此，大于0表示“已找到”。

在这种情况下，除非您对列表中的特定位置感兴趣，否则带有in部分将无用。