Tsql 如何在T-SQL联合查询中按结果集排序

我想在上一个sql查询中使用ORDERBY子句，我有3个以上的union查询。我不想对前2个联合查询排序，但我想在上一条sql语句中使用ORDERBY子句。 当前，正在获取错误

如果语句包含UNION、INTERSECT或EXCEPT运算符，则ORDER BY项必须出现在选择列表中

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orderby

是对联合的结果进行排序，但是您可以引入orderIndex列来实现正确的排序

以下是示例：

我尝试在下面的代码中构建示例数据

    create table table1(
        userid varchar(100),
        usertype varchar(100),
        date date
    )

    insert into table1(userid, date) values ('Einsmayr', '2020-10-27')
    insert into table1(userid, date) values ('Eins123', '2020-10-27')
    insert into table1(userid, date) values ('Einschmid', '2020-10-27')
    insert into table1(userid, date) values ('Einshuber', '2020-10-27')
    insert into table1(userid, date) values ('Einsreitmayr', '2020-10-27')

    create table table2 (
        Name varchar(100),
        id int
    )
 
    insert into table2(Name, id) values('Zweirich', 5)
    insert into table2(Name, id) values('Zweifel', 6)
 
    create table table3 (
        Name varchar(100),
        id int
    )
 
    insert into table3(Name, id) values('Dreisinger', 17)
    insert into table3(Name, id) values('Dreibert', 18)

这允许进行以下查询：

    select usertype, Number
    from (
        select 'Total Number of pat' usertype, convert(varchar(20), count(id)) Number, 1 orderIndex from table2 where id = 5
        union
        select 'Total Number of Doc' Name, convert(varchar(20), count(id)) Number, 2 orderIndex from table3
        union
        select usertype, count(distinct userid) Number, 3 orderIndex
        from (
            select userid,  case when userid like '%[0-9][0-9[0-9]' then 'transition' else 'non transition' end usertype
            from table1
            where date >= dateadd(day,-7, getdate())
        ) x
        group by x.usertype
    ) y
    order by y.orderIndex, y.usertype

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在此处找到解决方案：

您是否搜索了按联合排序的

[tsql]订单

？旁白：由于您使用的是

按用户类型分组

，因此不会出现任何重复的行。使用而不是

联合

将避免排除重复项所需的处理。

    select usertype, Number
    from (
        select 'Total Number of pat' usertype, convert(varchar(20), count(id)) Number, 1 orderIndex from table2 where id = 5
        union
        select 'Total Number of Doc' Name, convert(varchar(20), count(id)) Number, 2 orderIndex from table3
        union
        select usertype, count(distinct userid) Number, 3 orderIndex
        from (
            select userid,  case when userid like '%[0-9][0-9[0-9]' then 'transition' else 'non transition' end usertype
            from table1
            where date >= dateadd(day,-7, getdate())
        ) x
        group by x.usertype
    ) y
    order by y.orderIndex, y.usertype