代码如下：
---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：
SELECT (case when a.colorder=1 then d.name else null end) 表名, ( d.name) 表名2,
a.colorder 字段序号,a.name 字段名,
(case when COLUMNPROPERTY( a.id,a.name,'IsIdentity')=1 then '√'else '' end) 标识,
(case when (SELECT count(*) FROM sysobjects
WHERE (name in (SELECT name FROM sysindexes
WHERE (id = a.id) AND (indid in
(SELECT indid FROM sysindexkeys
WHERE (id = a.id) AND (colid in
(SELECT colid FROM syscolumns WHERE (id = a.id) AND (name = a
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