如何查询一个数据库中所有表的某个字段
答案:2 悬赏:10
解决时间 2021-04-08 05:01
- 提问者网友:芷芹
- 2021-04-07 04:57
如何查询一个数据库中所有表的某个字段
最佳答案
- 二级知识专家网友:我颠覆世界
- 2021-04-07 05:12
1.查询数据库中的所有数据库名:
SELECt Name FROM Master..SysDatabases ORDER BY Name
2.查询某个数据库中所有的表名:
SELECt Name FROM SysObjects Where XType='U' ORDER BY Name
3.查询表结构信息:
1 SELECt (case when a.colorder=1 then d.name else null end) 表名,
2 a.colorder 字段序号,a.name 字段名,
3 (case when COLUMNPROPERTY( a.id,a.name,'IsIdentity')=1 then '√'else '' end) 标识,
4 (case when (SELECT count(*) FROM sysobjects
5 WHERe (name in (SELECt name FROM sysindexes
6 WHERe (id = a.id) AND (indid in
7 (SELECt indid FROM sysindexkeys
8 WHERe (id = a.id) AND (colid in
9 (SELECt colid FROM syscolumns WHERe (id = a.id) AND (name = a.name)))))))
10 AND (xtype = 'PK'))>0 then '√' else '' end) 主键,b.name 类型,a.length 占用字节数,
11 COLUMNPROPERTY(a.id,a.name,'PRECISION') as 长度,
12 isnull(COLUMNPROPERTY(a.id,a.name,'Scale'),0) as 小数位数,(case when a.isnullable=1 then '√'else '' end) 允许空,
13 isnull(e.text,'') 默认值,isnull(g.[value], ' ') AS [说明]
14 FROM syscolumns a
15 left join systypes b on a.xtype=b.xusertype
16 inner join sysobjects d on a.id=d.id and d.xtype='U' and d.name<>'dtproperties'
17 left join syscomments e on a.cdefault=e.id
18 left join sys.extended_properties g on a.id=g.major_id AND a.colid=g.minor_id
19 left join sys.extended_properties f on d.id=f.class and f.minor_id=0
20 where b.name is not null
21 --WHERe d.name='要查询的表' --如果只查询指定表,加上此条件
22 order by a.id,a.colorder
SELECt Name FROM Master..SysDatabases ORDER BY Name
2.查询某个数据库中所有的表名:
SELECt Name FROM SysObjects Where XType='U' ORDER BY Name
3.查询表结构信息:
1 SELECt (case when a.colorder=1 then d.name else null end) 表名,
2 a.colorder 字段序号,a.name 字段名,
3 (case when COLUMNPROPERTY( a.id,a.name,'IsIdentity')=1 then '√'else '' end) 标识,
4 (case when (SELECT count(*) FROM sysobjects
5 WHERe (name in (SELECt name FROM sysindexes
6 WHERe (id = a.id) AND (indid in
7 (SELECt indid FROM sysindexkeys
8 WHERe (id = a.id) AND (colid in
9 (SELECt colid FROM syscolumns WHERe (id = a.id) AND (name = a.name)))))))
10 AND (xtype = 'PK'))>0 then '√' else '' end) 主键,b.name 类型,a.length 占用字节数,
11 COLUMNPROPERTY(a.id,a.name,'PRECISION') as 长度,
12 isnull(COLUMNPROPERTY(a.id,a.name,'Scale'),0) as 小数位数,(case when a.isnullable=1 then '√'else '' end) 允许空,
13 isnull(e.text,'') 默认值,isnull(g.[value], ' ') AS [说明]
14 FROM syscolumns a
15 left join systypes b on a.xtype=b.xusertype
16 inner join sysobjects d on a.id=d.id and d.xtype='U' and d.name<>'dtproperties'
17 left join syscomments e on a.cdefault=e.id
18 left join sys.extended_properties g on a.id=g.major_id AND a.colid=g.minor_id
19 left join sys.extended_properties f on d.id=f.class and f.minor_id=0
20 where b.name is not null
21 --WHERe d.name='要查询的表' --如果只查询指定表,加上此条件
22 order by a.id,a.colorder
全部回答
- 1楼网友:走,耍流氓去
- 2021-04-07 05:50
这个不可能使用简单一个查询语句来实现这个功能。因为你的这个需要基本都是比一定逻辑的查询,实现起来有相当的难度。因为首先要确定有多少张表,每张表中有多少个字段,然后才能实现某个字段中的某条记录包含你所需要的这个特定的值。
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