在一个SQL数据库中怎么查出包含某个特定字段的所有数据表信息
在工作中,笔者有时需要客户的要求更改某个表的字段值,但是数据库中涉及到这个字段的表多且复杂。如果没有完全修改会影响这个系统的运行,在SQL中有没有这样的工具或语句解决这个...
在工作中,笔者有时需要客户的要求更改某个表的字段值,但是数据库中涉及到这个字段的表多且复杂。如果没有完全修改会影响这个系统的运行,在SQL中有没有这样的工具或语句解决这个问题
如把b.name='字段名' 改为b.name like '%字段名'可以进行模糊查询。 解决不同的字段的后缀为同一个名称的查询。谢谢!问题解决! 展开
如把b.name='字段名' 改为b.name like '%字段名'可以进行模糊查询。 解决不同的字段的后缀为同一个名称的查询。谢谢!问题解决! 展开
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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
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