Question

我有两个表TMP和TMP1，所以我想从syscolumns中选择并获取2个表的列名我想要这样的结果

tablename columnname  tablename1 columnname1

Tmp         col1        TMP1         col1

Tmp         col2        TMP1         col2

这是我试图做的，这是错误的：

select sc.name , sc1.name
from syscolumns sc inner join syscolumns sc1
on( sc.id=sc1.id and sc.id=object_id('TMP1'))
where sc.id=object_id('TMP')

Answer 1

假设：

这是Sybase ASE
表的列数相同
两个表中的列名相同

设置：

create table TMP (col1 int, col2 int)
go
create table TMP1(col1 iny, col2 int)
go

有两种方法可以做到这一点，但我们将调整给定的查询：

select  'TMP' as tablename,
        sc.name as columnname,
        'TMP1' as tablename1,
        sc1.name as columname1

        -- can't join syscolumns on 'id' because each table has a unique object id;
        -- only thing we have to join on is the similarly named columns

from    syscolumns sc
join    syscolumns sc1
on      sc.name = sc1.name

where   sc.id  = object_id('TMP')
and     sc1.id = object_id('TMP1')

order by sc.name
go

 tablename columnname tablename1 columname1
 --------- ---------- ---------- ----------
 TMP       col1       TMP1       col1
 TMP       col2       TMP1       col2

以上代码已在ASE 15.7 SP138数据服务器上进行了测试。

在不同的列上显示所选表及其coulm_name

1 个答案: