使用分隔符连接多个字段

Question

我的表包含Address1，Address2，Address3等...其中值可以为null或为空。

我通过将这些字段连接成一个来构建完整地址。

Select Column1, Column2, ISNULL(Address1,'') + ', ' + ISNULL(Address2,'')+ ', ' + ISNULL(Address3,'') As FullAddress
from TableName

问题是如果address1为null，但它仍然附加＆＃39;，＆＃39;我想删除。所以它最终会像＆＃39;，address2value＆＃39;

有更好的方法吗

Answer 1

如果您不想要尾随或引导逗号，则可以执行以下操作：

services.AddEntityFrameworkSqlServer()
            .AddScoped<SqlServerConventionSetBuilder, DefaultCoreConventionSetBuilder>()
            .AddScoped<SqlServerMigrationsSqlGenerator, DefaultSqlServerMigrationSqlGenerator>()
            .AddDbContext<DataContext>();

Answer 2

这是否符合您的要求？

Select  Column1, 
        Column2, 
        ISNULL(Address1+',','') + ISNULL(Address2+',','')+ISNULL(Address3,'') As FullAddress
from    TableName

结果：

Answer 3

如果任何address1或address2或address3包含Null，则不会添加分隔符

SELECT Column1, Column2, CONCAT_WS(',',IFNULL(Address1,NULL),IFNULL(Address2,NULL),IFNULL(Address3,NULL)) AS FullAddress
FROM TableName;