Question

当我将常量字符串添加为字段时，出现错误消息

这是错误消息：

我想将表名作为列添加到SQL视图中的行中，出现错误消息：

已执行的SQL语句：

[...]

错误来源：.Net SQL客户端数据提供程序

错误消息：所有使用UNION，INTERSECT或EXCEPT运算符组合的查询必须具有相同数量的表达式及其目标列表。

SELECT        Location, ClientID, Type_C, Todays_Date, '1100_vAC' as S_Table

FROM            dbo.1100_vAC

UNION ALL

SELECT        Location, ClientID, Type_C, Todays_Date, Time_Stamp, '1100_vAD' as S_Table
FROM            dbo.1100_vAD
UNION ALL
SELECT        Location, ClientID, Type_C, Todays_Date, Time_Stamp,  '1101_AC' as S_Table
FROM            dbo.1101_AC
UNION ALL
SELECT        Location, ClientID, Type_C, Todays_Date, Time_Stamp, '1101_AA' as S_Table
FROM            dbo.1101_AA
UNION ALL
SELECT        Location, ClientID, Type_C, Todays_Date, Time_Stamp, '1102_AC' as S_Table
FROM            dbo.1102_AC;

我想为每一行查看源表。

Answer 1

您应该更正您的代码（删除重复的time_stamp）

SELECT        Location, ClientID, Type_C, Todays_Date, Time_Stamp, '1100_vAC' as S_Table

FROM            dbo.1100_vAC

UNION ALL

SELECT        Location, ClientID, Type_C, Todays_Date, Time_Stamp,  '1100_vAD' as S_Table
FROM            dbo.1100_vAD
UNION ALL
SELECT        Location, ClientID, Type_C, Todays_Date, Time_Stamp,  '1101_AC' as S_Table
FROM            dbo.1101_AC
UNION ALL
SELECT        Location, ClientID, Type_C, Todays_Date, Time_Stamp,  '1101_AA' as S_Table
FROM            dbo.1101_AA
UNION ALL
SELECT        Location, ClientID, Type_C, Todays_Date, Time_Stamp,  '1102_AC' as S_Table
FROM            dbo.1102_AC;

Answer 2

联合，相交和除外需要相同数量的列（最好也有顺序）。在除了第一个选择的所有选择上都复制了TIMESTAMP的过程中出现了一个错误。

Answer 3

第一行包含6列，其余行包含7列，因为在其余各行中增加了一个额外的时间戳列。

Union / union都联合数据而不是它联接的列。因此，您还需要保留与类型相同的列数，以确保整个数据同步且一致

添加常量字符串字段时，SQL失败

3 个答案: